Cold header crankshaft sliding block mechanism with buffer structure

Abstract

The cold header crankshaft sliding block mechanism with the buffer structure is characterized in that the cold header crankshaft sliding block mechanism comprises a front sliding block and a rear sliding block, and the buffer structure is arranged between the front sliding block and the rear sliding block. The front sliding block and the rear sliding block are movably connected through an adjusting nut, and the adjusting nut is fixed through a locking nut after the position of the front sliding block and the position of the rear sliding block are fixed. The buffer structure can be a spring; the buffer structure can be composed of a plunger, oil and gas. The buffer structure can be composed of a plunger, a piston, oil and gas. The buffering structure can be composed of a plunger, oil and an air bag. The buffer structure can be composed of a plunger, a spring, oil and gas. After the buffering structure is arranged between the two sliding blocks, the rear sliding block pushed by the crankshaft connecting rod rapidly impacts the front sliding block for clamping the blank, strong upsetting force is generated on the blank, and the blank is formed. And the effect is more accurate, reliable, efficient and safe.

Description

Technical Field

[0001] This invention relates to the technical field of mechanical manufacturing, and in particular to a crankshaft slider mechanism for a cold heading machine with a buffer structure. Background Technology

[0002] A cold heading machine is a specialized piece of equipment used for mass production of fasteners such as nuts and bolts. It forges and thickens the top of bars or wires at room temperature, primarily through upsetting. The processing steps of a cold heading machine generally include feeding, cutting, forming, and unloading. The overall power source is an electric motor, with most mechanical movements provided by various crankshaft-slider mechanisms. The crankshaft-slider mechanism is a planar four-bar linkage consisting of a crank, connecting rod, and slider. It achieves the conversion between rotary motion and reciprocating linear motion through revolute and prismatic joints.

[0003] Currently, hydraulic presses are commonly used for processing highly elastic or hard materials, or for parts where processing speed is limited, to ensure forming quality. The productivity of hydraulic presses is affected by factors such as the operating frequency of the solenoid valves, the working and return strokes determined by the product length, and the flow and pressure of the hydraulic system. Its productivity is relatively low, typically around 10 pieces per minute. In contrast, cold heading machines have a high productivity, generally exceeding 100 pieces per minute. For parts that can be produced by both types of equipment, the productivity of a cold heading machine is approximately 10 times higher than that of a hydraulic press.

[0004] Hydraulic presses offer convenient speed adjustment during production. They begin with a rapid, idle stroke followed by a working stroke. Upon contact with the workpiece, the pressure gradually increases, resulting in slow and uniform deformation. This makes them suitable for pressure forming of various materials. Cold heading machines operate according to their predetermined crankshaft-slider mechanism. The working stroke and return stroke take the same amount of time, with no distinction between rapid advance, working stroke, and rapid return. During the working stroke, the speed gradually decreases, rapidly impacting the workpiece to move it and deform it under pressure. Near the end of the stroke, the speed becomes zero. The impact speed depends on the selected cold heading machine's speed, stroke, and workpiece length. All other things being equal, a longer workpiece results in a higher impact speed, while a shorter workpiece results in a slower impact speed, reaching zero near the end. Therefore, cold heading is unsuitable for materials sensitive to initial speed or for stamping processes with speed limitations.

[0005] Since cold heading can greatly improve productivity, the key to replacing hydraulic press production with cold heading and improving productivity is to simulate the stamping process of a hydraulic press on the billet on a cold heading machine: contact - gradual pressure - strong pressing and forming, so as to adapt to the forming of sensitive materials. Summary of the Invention

[0006] The purpose of this invention is to provide a crankshaft slider mechanism for a cold heading machine with a buffer structure to solve the problems mentioned in the background art.

[0007] To solve the above-mentioned technical problems, the present invention is achieved through the following technical measures: a crankshaft slider mechanism for a cold heading machine with a buffer structure, characterized in that: it includes a front slider and a rear slider, and a buffer structure is provided between the front slider and the rear slider.

[0008] As an improvement of the present invention, the front slider and the rear slider are movably connected by an adjusting nut, and the adjusting nut is fixed in place by a locking nut after the position is set. The purpose of this design is that both ends of the adjusting stud have external threads, one end is threaded to the front slider, and the other end is threaded to the adjusting nut. The middle section of the adjusting stud is a smooth rod, which allows the rear slider to move along the smooth rod of the adjusting stud.

[0009] As an improvement to the present invention, the buffer structure is a spring, one end of which abuts against the front slider and the other end of which abuts against the rear slider. The purpose of this design is to utilize the spring force to create a gap between the front and rear sliders. The interval is such that the current slider stops moving when it contacts the upsetting billet, and the next slider continues to move forward. Then, the rear slider strikes the front slider to apply upsetting force, causing the front and rear sliders to move together to upset the billet.

[0010] As an improvement of the present invention, the buffer structure consists of a plunger, oil, and gas. The purpose of this design is to achieve high volume utilization by mixing gas and oil together. However, the disadvantage is that gas can easily mix into the oil, causing the oil to oxidize and deteriorate.

[0011] As an improvement to this invention, the buffer structure consists of a plunger, a piston, oil, and gas. The purpose of this design is to use the piston to separate the gas from the oil, preventing the oil from deteriorating. The disadvantages are that the frictional resistance of the piston affects the recovery speed of the compressed gas, causing it to be less responsive. At the same time, the sealing performance of the piston may also lead to the risk of gas leaking into the oil section.

[0012] As an improvement of the present invention, the buffer structure consists of a plunger, oil, and an air bladder. The purpose of this design is to seal the gas inside the air bladder, preventing the possibility of gas mixing with the oil, resulting in good isolation and sensitive operation.

[0013] As an improvement to this invention, the buffer structure consists of a plunger, a spring, hydraulic fluid, and gas. The purpose of this design is that it is essentially a combination of two buffer structures: an oil-gas buffer and a spring buffer, arranged side-by-side to generate superimposed forces. This arrangement ensures coordinated displacement. The difference lies in the spring's position: in a standalone spring buffer structure, the spring is directly supported on the front slider and the bottom of the cylinder; in the combined structure, one end of the spring rests on the plunger, while the other end is supported on the bottom of the cylinder. However, care must be taken to ensure that the spring does not act on the gas-isolating piston or the gas bladder.

[0014] As an improvement of the present invention, the rear slider is provided with an inner cavity for accommodating the buffer structure. The purpose of this design is that the inner cavity serves to accommodate gases and oils, similar to the inner wall of a piston, and also functions as a guide for movement.

[0015] As an improvement to the present invention, the gas is placed at the bottom of the inner cavity, and the oil is in contact with the plunger portion. The purpose of this design is to provide good lubrication for the plunger.

[0016] Compared with existing technologies, the advantages of this invention are as follows: This invention divides the traditional slider into a front slider and a rear slider. A buffer structure is set between the two sliders. During the cold forging process, when the front slider contacts the billet, its force is very small and cannot push the billet to form; it will press against the billet but stop moving forward. Meanwhile, the rear slider continues to move forward, pushing the buffer structure to function, compressing the buffer portion, and gradually increasing the clamping force. After reaching the set compression amount (adjustable), the front and rear sliders fit tightly together, and the crankshaft connecting rod pushes the front and rear sliders together to move forward. At this time, the rear slider, pushed by the crankshaft connecting rod, rapidly impacts the front slider holding the billet, generating a strong forging force on the billet and shaping it. Before forging the billet, the front slider acts as a pre-installed protective cover on the top surface of the billet, providing stable support or clamping. The rear slider impacts the front slider and the billet, achieving stable and reliable forging. Its effect is more precise, reliable, efficient, and safe. Attached Figure Description

[0017] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0018] In the attached diagram: Figure 1 This is a schematic diagram of the spring buffer structure described in this invention.

[0019] Figure 2 This is a schematic diagram of the oil-gas mixing buffer described in this invention.

[0020] Figure 3 This is a schematic diagram of the oil and gas isolation buffer described in this invention.

[0021] Figure 4 This is a schematic diagram of the oil-gas airbag buffer described in this invention.

[0022] Figure 5 This is a schematic diagram of the spring-oil-gas combined buffer according to the present invention.

[0023] Figure 6 is a schematic diagram of the crankshaft slider mechanism with buffer structure described in this invention.

[0024] Figure 7 is a motion displacement curve of the front slider and the rear slider according to the present invention.

[0025] Explanation of reference numerals in the attached drawings: 1. Front slider; 2. Rear slider; 3. Adjusting nut; 4. Locking nut; 5. Spring; 6. Piston; 7. Oil; 8. Gas; 9. Piston; 10. Bed; 11. Crankshaft; 12. Connecting rod; 13. Main slider; 14. Moving mold; 15. Fixed mold; 16. Air bladder; 17. Inner cavity. Detailed Implementation

[0026] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0027] Please refer to Figure 1-7 .

[0028] This invention provides a cold heading machine that simulates the working process of a hydraulic press and is suitable for forming sensitive materials. The focus of the invention is the crankshaft-slider mechanism of the cold heading machine.

[0029] This invention simulates the hydraulic press pressure forming process by changing the speed and pressure when the crankshaft slider mechanism of a cold heading machine contacts the billet during the forward forging process: contact with the billet -- gradual pressure application -- strong pressing and forming.

[0030] In the embodiments of this invention application, please refer to Figure 1 . Figure 1 The elastic element spring 5 is used as a buffer mechanism. The force of spring 5 creates a gap of ∆ between the front slider 1 and the rear slider 2. When the front slider 1 contacts the upsetting blank, it stops moving. The rear slider 2 continues to move forward ∆ and then hits the front slider 1 to apply upsetting force, so that the front slider 1 and the rear slider 2 move together to upset the blank.

[0031] Let the stiffness of spring 5 be k, and the weight of the front slider 1 be k. The weight of the rear slider 2 is The front slider 1 and the rear slider 2 are on the same guide rail with a friction coefficient of f. The spring 5 must overcome the frictional force of the front slider 1 to separate the front slider 1 and the rear slider 2. Its frictional force is: The amount of compression required for the buffer spring 5 to push the front slider 1 against frictional resistance is: The force generated by compressing spring 5: The original length of spring 5 is: When spring 5 is fully compressed, spring 5 is in Based on this, it is further compressed by ∆. The force generated by this compression is applied to the upsetting workpiece through the front slider 1. The relationship is as follows: In the formula: - The distance (m) between front slider 1 and rear slider 2; - Length of slider 1 when spring 5 presses against it (m); - The amount of pre-compression (m) required for spring 5 to press against and balance the frictional force of the sliding block 1. k - Spring stiffness 5 (N / m); - Friction force of front slider 1 (N); - Total pressure (N) acting on cold-forged parts; - The force of spring 5 (N) in the initial compressed state is balanced by the friction of the front slider 1. - The force (N) generated by the maximum compression of spring 5 at the end of spring 5 compression. - Gravitational acceleration (9.81 m / s²) 2 ); During the design process, the clamping force required to be applied to the moving die 14 before upsetting is first determined. ,length and compressed stroke Select the stiffness k of spring 5, and then determine the pre-compression of spring 5 required to overcome the frictional resistance of the front slider 1. The spring 5 used can be a general compression spring 5 or a disc spring 5, etc. The appropriate stiffness of the spring 5 can be obtained by series or parallel connection. If necessary, a parallel combination of left-hand and right-hand helical springs 5 ​​can be selected to improve safety.

[0032] In the embodiments of this invention application, please refer to Figure 2 , Figure 3and Figure 4 . Figure 2 , Figure 3 and Figure 4 The system uses a combination of liquid 7 and gas 8 as a buffer. Liquids have very low compressibility and are usually considered incompressible. Gas 8 has high compressibility, but the pressure required for industrial applications is not high, and the resulting force is also relatively small. Combining liquid and gas 8 to form a buffer, with oil 7 as the liquid, can lubricate the movement of the plunger 6 structure while facilitating the adjustment of the volume ratio between gas 8 and oil 7 to adjust the relationship between the compression stroke and the compression force.

[0033] Figure 2 The buffering process involves mixing gas 8 with oil 7, resulting in high volume utilization. However, gas 8 is easily mixed into oil 7, causing the oil 7 to oxidize and deteriorate.

[0034] Figure 3 The floating piston 9 is used to separate the gas 8 from the oil 7 to prevent the oil 7 from deteriorating. However, the frictional resistance of the floating piston 9 affects the recovery speed of the gas 8 after compression, resulting in insensitive operation. At the same time, the sealing quality of the piston 9 will also cause the gas 8 to leak into the oil 7 chamber.

[0035] Figure 4 The gas 8 is sealed within the gas bladder 16 structure, preventing the gas 8 from mixing with the oil 7, resulting in good isolation and sensitive operation. In this oil-liquid combination structure, the gas 8 is preferably placed at the bottom of the cylinder, while the lubricating oil in the liquid portion is in contact with the plunger 6, thus providing good lubrication for the plunger 6.

[0036] The design takes into account the incompressibility of liquids; the pressure of gas 8 inside the cylinder is the same as the pressure of oil 7, and the compression is mainly generated by compressing gas 8. The cylinder pressure after pre-compression under the working conditions of the front and rear sliders 2 is... At the end of compression, the pressure inside the cylinder is The relationship between pressure and volume during the working process, calculated based on the isothermal process of gas 8, is as follows: The volume of gas 8 is: Then we have: Its compression (stroke) is: The resulting forces acting on the blank before pushing the slider 1 and at the end of compression are respectively: In the formula: -In the initial state, the cylinder pressure (MPa) required to overcome the friction of the front slider 1. - The cylinder pressure (MPa) when the front slider 1 and the rear slider 2 move together at the end of compression. -In the initial state, the volume of gas 8 inside the cylinder required to overcome the friction of the front slider 1 ( ); -At the end of compression, the volume of gas 8 inside the cylinder when the front slider 1 and the rear slider 2 move together ( ); -In the initial state, the height (m) of the gas 8 inside the cylinder required to overcome the friction of the front slider 1. -At the end of compression, the height of the gas 8 inside the cylinder when the front slider 1 and the rear slider 2 move together. - The force (N) of gas 8 that balances the friction of the front slider 1 under the initial compression state. - The force (N) generated by the gas 8 when the spring 5 is fully compressed. Within a given cylinder chamber, the oil 7 serves to alter the cylinder length and provide lubrication, facilitating the adjustment and modification of the volume and pressure of the gas 8 within the cylinder. The pressures of the gas 8 and oil 7 are the same, with the maximum pressure of the compressed gas 8 reaching tens of MPa. The cylinder diameter is designed to accommodate the required force. The stroke necessitates adjusting the volumes of the gas 8 and liquid within the cylinder; for longer strokes, the gas 8 volume is increased, while for shorter strokes, the liquid volume is increased, and the gas 8 volume is decreased. When designing this oil-gas combination buffer structure, the cylinder pressure required to balance the friction of the slider 1 before operation is first determined. Then combine the compression amount and In accordance with the requirements, select the capacity of gas 8 and verify that the final pressure of gas 8 is within the maximum allowable pressure range for gas 8 compression.

[0037] Due to the limitation of the maximum pressure of gas 8, the force generated by the gas-liquid combined buffer structure is usually not large. When the force cannot meet the requirements for large thrust, a combination of mechanical spring 5, liquid, and gas 8 can be used to increase the required force.

[0038] In the embodiments of this invention application, please refer to Figure 5 . Figure 5 This is a buffer structure composed of spring 5, oil 7, and gas 8. Essentially, it's a combination of the aforementioned oil-gas buffer and spring 5 buffer, arranged side-by-side, resulting in superimposed forces. This arrangement ensures coordinated displacement. The difference lies in the spring 5 structure: in the individual spring 5 buffer structure, spring 5 is directly supported on the front slider 1 and the bottom of the cylinder; in the combined structure, one end of spring 5 rests on the plunger 6, and the other end is supported on the bottom of the cylinder. However, it's crucial that it doesn't act on the gas 8, which isolates the piston 9, or the air bladder 16. The mechanical relationship of the combined buffer structure is expressed by the following formula: The design method of the combined buffer structure is to combine the design methods and design sequence of the two buffer structures mentioned above.

[0039] Figures 1-5 This is a schematic diagram of the slide block of a cold heading machine with a buffer structure. A schematic diagram of the crankshaft slide block mechanism of a cold heading machine with a buffer structure is shown below. Figure 6 express.

[0040] In a crankshaft-slider mechanism with a buffer structure, when the crankshaft 11 rotates at a constant speed, the motions of the front and rear sliders are different. The motion of the rear slider 2 remains unchanged, following the typical motion law of a crankshaft-slider mechanism. This motion law can be expressed by the following formula: in Immediately ,but Simplify and rewrite as When α rotates from 0° to 180°, it is the reverse stroke, and when it rotates from 180° to 360° (back to 0°), it is the forward stroke, which is used for upsetting.

[0041] There is a buffer stroke between the front slider 1 and the rear slider 2. The front slider 1 is pulled by the rear slider 2, and its motion pattern changes. When the rear slider 2 begins to move backward, the interaction force F between the front and rear sliders 1 and 2 keeps the front slider 1 pressed tightly against the origin position. When the rear slider 2 moves away from the origin position, the value of F is equal to... At that time, the front slider 1 starts to move and the stroke is always a certain distance. Until the retreat ended.

[0042] When slider 1 moves forward, the F1 action between the front slider 1 and the rear slider 2 keeps them in a constant position. The slider moves forward until the front slider 1 touches the blank and is stopped, while the rear slider 2 continues to move forward until the gap between them is eliminated. Then, the front slider 1 and the rear slider 2 combine and continue moving forward to form the upsetting blank. The motion relationship between the two is determined by... Figure 7 As shown, Figure 7 The horizontal axis represents the crank angle from 0 to 360 degrees, and the vertical axis represents the stroke (100 represents the full stroke). It can be seen that, compared to the traditional slider structure, the cold heading machine slider with a buffer function sacrifices a buffer spacing for the processing length of the blank. .

[0043] The basic principle of this invention is to use mechanical mechanisms, hydraulic and pneumatic systems, or combinations thereof, to form a buffer space, thereby reducing the speed and impact force of the movement of the crankshaft 11 slider in the existing cold heading machine when it comes into contact with the blank.

[0044] This invention only changes the slider in the crankshaft slider mechanism of the cold heading machine, without changing the working sequence or other structures of the cold heading machine.

[0045] Compared to traditional slides, the cold heading machine slide of this invention consists of two parts: a front slide 1 and a rear slide 2. These two parts share the same horizontal and lateral guidance, with a buffer element placed between them to create a follow-up motion with a gap between them. Rigidly connecting these two parts is equivalent to a conventional cold heading machine slide. The front slide 1 and rear slide 2 are bolted together, leaving a gap in the middle for adjusting the required compression amount (buffer stroke). The structure of the buffer element can be varied and flexibly configured according to the application and working requirements.

[0046] Please refer to Figure 6A crankshaft-slider mechanism is installed on the bed 10 of the cold heading machine. In this invention, a buffer element is added to the slider, and a total slider 13 is formed by the front slider 1 and the rear slider 2, which is movably fixed by the adjusting nut 3 and the locking nut 4. The rear slider 2 has an inner cavity 17 for housing the buffer structure. During the forward movement of the cold heading machine, when the front slider 1 contacts the blank, its force is very small and cannot push the blank to form, so it presses against the blank but stops moving forward. The rear slider 2 continues to move forward, pushing the buffer element to function, compressing the buffer part, and gradually increasing the clamping force. After reaching the set compression amount (adjustable), the front and rear sliders fit tightly together, and the crankshaft 11 and connecting rod 12 push the front slider 1 and the rear slider 2 together to move forward. At this time, the rear slider 2, pushed by the crankshaft 11 and connecting rod 12, rapidly impacts the front slider 1 holding the blank, generating a strong forging force on the blank and shaping it. Before the upsetting blank, the front slider 1 acts as a protective cover on the top surface of the blank and is stably supported or clamped. The rear slider 2 impacts the front slider 1 and the blank, achieving upsetting in a stable and reliable manner. Its effect is more precise, reliable, efficient and safe.

[0047] The buffer stage is designed to simulate the working state of a hydraulic press, making the cold heading process similar to the stamping process of a hydraulic press. The compression amount of the buffer stage is the distance between the two sliders. This compression amount ensures that the punch part mounted on the front slider contacts the billet earlier, forming a whole, and is then forcefully impacted by the rapidly moving rear slider 2. This compression amount reduces the stroke of the front slider 1 as it moves with the crankshaft slider mechanism. The reduction in stroke is equal to the buffer distance. The size of this distance only affects the maximum length of the billet that can be sheared at the first station. It does not affect the transfer of the clamps between stations, has no impact on the processing of subsequent stations, and does not affect the overall forging force or forging productivity of the machine.

[0048] The force generated by the buffer element is small, several orders of magnitude less than the upsetting force of cold forging. The buffer element does not affect the setting and operation of the ejection mechanism of the moving die 14 on the slide block. The moving die 14 cooperates with the fixed die 15. The ejection mechanism of the moving die 14 begins the ejection operation at the end of upsetting and when it is ready to retract. The required time (stroke) is very short. At this time, the upsetting force is still close to its maximum, and the front slide block 1 and the rear slide block 2 are pressed tightly together and will not separate. The design and arrangement of the ejection mechanism of the moving die 14 are based on the front slide block 1 and the rear slide block 2 being integrated; the buffer element in the middle is equivalent to cutting the entire slide block into front and rear parts and embedding them into the structure.

[0049] The beneficial effects of this invention are as follows: This invention divides the traditional slider into a front slider 1 and a rear slider 2. After setting a buffer structure in the middle between the two sliders, during the cold forging process, when the front slider 1 contacts the blank, its force is very small and cannot push the blank into shape, so it presses against the blank but stops moving forward. Meanwhile, the rear slider 2 continues to move forward, pushing the buffer structure to function, compressing the buffer portion, and gradually increasing the clamping force. After reaching the set compression amount (adjustable), the front slider 1 and the rear slider 2 fit tightly together, and the crankshaft 11 and connecting rod 12 push the front slider 1 and the rear slider 2 together to move forward. At this time, the rear slider 2, pushed by the crankshaft 11 and connecting rod 12, rapidly impacts the front slider 1 holding the blank, generating a strong forging force on the blank and shaping it. Before the upsetting blank, the front slider 1 acts as a protective cover on the top surface of the blank and is stably supported or clamped. The rear slider 2 impacts the front slider 1 and the blank, achieving upsetting in a stable and reliable manner. Its effect is more precise, reliable, efficient and safe.

[0050] In the description of this invention, it should be noted that the terms "vertical," "upper," "lower," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0051] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0052] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. 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 crankshaft slider mechanism for a cold heading machine with a buffer structure, characterized in that: It includes a front slider (1) and a rear slider (2), and a buffer structure is provided between the front slider (1) and the rear slider (2).

2. The crankshaft slider mechanism of a cold heading machine with a buffer structure according to claim 1, characterized in that: The front slider (1) and the rear slider (2) are movably connected by an adjusting nut (3), and the adjusting nut (3) is fixed in place by a locking nut (4) after the position is set.

3. The crankshaft slider mechanism of a cold heading machine with a buffer structure according to claim 1, characterized in that: The buffer structure is a spring (5), one end of which presses against the front slider (1), and the other end of which presses against the rear slider (2).

4. The cold heading machine crankshaft slider mechanism with buffer structure according to claim 1, characterized in that: The buffer structure consists of a plunger (6), oil (7) and gas (8).

5. The crankshaft slider mechanism of a cold heading machine with a buffer structure according to claim 1, characterized in that: The buffer structure consists of a plunger (6), a piston (9), oil (7), and gas (8).

6. The cold heading machine crankshaft slider mechanism with buffer structure according to claim 1, characterized in that: The buffer structure consists of a plunger (6), oil (7), and an air bladder (16).

7. The cold heading machine crankshaft slider mechanism with buffer structure according to claim 1, characterized in that: The buffer structure consists of a plunger (6), a spring (5), oil (7), and gas (8).

8. The cold heading machine crankshaft slider mechanism with buffer structure according to claims 3 to 7, characterized in that: The rear slider (2) is provided with an inner cavity (17) for placing the buffer structure.

9. The cold heading machine crankshaft slider mechanism with buffer structure according to claim 8, characterized in that: Gas (8) is placed at the bottom of the inner cavity, and oil (7) is in contact with the plunger (6).

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