An automatic lubricating core mold spinning mold

Abstract

The present invention discloses an automatic lubricating core mold spinning die, which integrates key devices such as oil channels, oil inlets, oil outlets and oil chambers. The piston rod penetration structure passes through the inner side of other parts, the gear rear cover of the planetary gearbox is glued to the rod end cover, the upper end of the outer cylinder is connected and fixed to the rod end cover by a double-headed stud, the inner oil chamber, that is, the oil channel on the inner cylinder is fitted with the inner surface of the outer cylinder, and the piston is threadedly connected to the lower end of the piston rod, and both are located in the inner cylinder. The present invention realizes the precise supply of lubricating oil. During the spinning process, the inner and outer barrels work together at a specific speed ratio to ensure that the lubricating oil can be accurately and timely added where it is most needed, thereby greatly improving the lubrication effect. Not only can the lubricating oil be accurately applied to the key parts of the processing, but it also ensures the full utilization of the lubricating oil, avoids unnecessary waste, and improves production efficiency. At the same time, it also brings a more refined and efficient operating experience to the core mold spinning process.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical processing, and in particular relates to an automatic lubricating core mold spinning die. Background Art

[0002] Various spinning processes are currently available on the market. Friction between the blank and the core die is inevitable during the spinning process. This high-stress relative motion can cause surface damage to the die and blank, or even cracking and failure. Improving the lubrication between the core die and blank and reducing friction can significantly improve the spinning process, reduce friction between the die and blank, and reduce the material's resistance to deformation.

[0003] At present, spinning technology rarely considers the lubrication of the core mold and the blank. Lubricating oil is usually applied to the core mold before spinning, and sometimes no lubricating oil is even applied. During the spinning process, the friction between the core mold and the metal material will generate a lot of heat. If the lubrication is insufficient, it will not only increase the wear of the mold, but also affect the surface quality and dimensional accuracy of the workpiece. Because the material continues to flow during the spinning process, the applied lubricating oil will be carried away by the formed material under the action of high pressure, resulting in poor lubrication conditions for the blank and the core mold, which will lead to surface scratches, delamination of the inside and outside of the workpiece, and damage to the core mold. In addition, the manual or mechanical application of lubricating oil often makes it difficult to ensure the uniform distribution of the oil film on the surface of the core mold, which will lead to local stress concentration during the spinning process and increase the risk of material rupture or delamination. In addition, the conventional lubricating liquid spraying method has low precision, resulting in a large amount of lubricating liquid waste. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art and to provide an automatically lubricating core die spinning die, which achieves an automatic, efficient and uniform lubrication effect.

[0005] The technical solutions of the present invention are as follows:

[0006] The design of an automatic lubrication core spinning die consists of four main components: an outer cylinder, an inner oil chamber, a piston and piston rod, and a planetary gearbox. The piston rod penetrates the structure and passes through the inside of other components. The planetary gearbox's rear cover is glued to the rod end cover. The upper end of the outer cylinder is connected to the rod end cover via studs. The inner oil chamber, or the oil channel on the inner cylinder, mates with the inner surface of the outer cylinder. The piston is threadedly connected to the lower end of the piston rod, both located within the inner cylinder. Outside the main structure, the tail pin and piston rod are keyed to prevent relative movement. The tail pin contains an oil pipe that connects to the hollow piston rod, allowing the tail pin to push the piston rod to draw lubricant. The upper section of the piston rod is connected to the tail pin, and the middle section passes through the planetary gearbox. The planetary gearbox, as a transmission mechanism, consists of a sun gear, planetary gears, and internal gears. The planetary gears are connected to the sun gear via a connecting shaft. The working principle of a planetary gear system is to transmit power and torque through the rotation of the sun gear. When the sun gear rotates, it simultaneously drives the internal gear and planetary gears to rotate. The exterior consists of a front and rear gear cover connected by threads, while the rear gear cover is glued to the rod end cap. The piston rod mates axially with the sun gear, while the planetary pinions are connected to the base via a shaft. The base is bolted to the upper end cap of the sliding sleeve, which is then connected to the inner cylinder via studs. This allows the planetary gearbox to drive the inner cylinder. The piston rod passes through the sliding sleeve, which adjusts or limits its range of motion. A sealing ring on the sliding sleeve prevents lubricant leakage. The piston and the end of the piston rod are connected using a nut-type connection. Two sealing rings on the piston prevent oil leakage during operation. One end of the spring is glued to the lower end of the sliding sleeve, while the other end is glued to the upper end of the piston. The up and down movement of the piston controls the lubrication of the oil. A one-way valve is also threaded onto the end of the piston rod to control the flow of the oil. The lower end of the inner cylinder is fixed to the rodless cavity end cover by a double-headed stud connection. The inner cylinder is nested in the outer cylinder. The outer cylinder is fixed to the rod end cover and the rodless cavity end cover at the upper and lower ends of the outermost side by bolts respectively. The array-distributed oil ports on the outer cylinder cooperate with the oil channels on the inner cylinder to realize lubricating oil transportation and processing materials in all directions.

[0007] 1. The mold automatically extracts and discharges lubricating oil, enabling intelligent management of lubrication within the spinning cylinder. This function utilizes the mechanical energy conversion during the spinning process to automatically sense and adjust the lubricating oil supply, ensuring uniform and appropriate lubrication of the cylinder's inner wall during high-speed rotation and material deformation. This effectively reduces frictional resistance, extends the service life of the mold and cylinder, and improves the precision and surface quality of the spinning process.

[0008] 2. The planetary gear transmission system cleverly integrated into the mold not only demonstrates a high level of mechanical design intelligence but also significantly optimizes the lubricant control strategy. With its efficient and stable transmission characteristics, the planetary gears precisely control the opening and closing degree and frequency of the oil outlet valve, achieving precise regulation of lubricant flow.

[0009] 3. Lubricant is steadily drawn from a specially designed oil-reservoir tail. This design fully utilizes the mold's spatial layout and enables lubricant recycling. The tail not only serves as a lubricant storage and supply station, but also cleverly acts as a torque transfer point for the core mold's center push rod. Through its precise internal mechanical structure, it efficiently transmits power to the push rod, ensuring a smooth spinning process.

[0010] Compared with the prior art, the present invention has the following technical effects:

[0011] (1) It has the ability to automatically lubricate the core mold. The core mold of the present invention automatically releases oil as the tail top is pressed down during operation, so that the mold can be fully lubricated during operation. The transmission device can realize automatic lubrication of the mechanical structure.

[0012] (2) Automatic oil suction and discharge. The internal part of the present invention is a positive displacement pump, which completes its oil suction and lubrication functions through the up and down movement of the piston; the external part is equipped with a special lubrication oil flow channel as a spinning mold to output the oil to the working area.

[0013] (3) Effective lubrication of the working area is achieved. During the spinning process, the oil outlet moves with the movement of the tail top and is always located in the spinning working area. This not only effectively reduces the friction between the core die and the blank, reduces scratches on the blank, mold wear, and reduces the material's resistance to deformation, but also improves the accuracy of lubrication and reduces unnecessary waste during the lubrication process.

[0014] (4) Save lubricating oil. The present invention has a speed regulating function, which can control the interval time of each lubricating oil discharge, control the oil discharge cycle, and save lubricating oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The overall front view of the core mold appearance structure of the present invention

[0016] Figure 2 Schematic diagram of the overall cross-sectional structure of the automatic lubricating core mold spinning mold of the present invention

[0017] Figure 3 Schematic diagram of the internal structure of piston spinning

[0018] Figure 4 Overall axonometric drawing of the internal working structure of the core mold

[0019] Figure 5Top view of the interior of the spinning core mold for cylindrical parts

[0020] Figure 6 Schematic diagram of the internal structure of a planetary gearbox

[0021] Figure 7 Internal structure of the sliding sleeve DETAILED DESCRIPTION

[0022] Figure 1 The figure shows the external overall structure of an automatic lubricating core mold spinning mold of the present invention. Figure 2 The schematic diagram of the overall cross-sectional structure of the core mold spinning mold shown is composed of a tail top 1 containing an oil pipe, a piston rod 2, a planetary gear box 3, a rod end cover 4, a sleeve 5, a sleeve upper end cover 6, a spring 7, a piston 8, an oil inlet 9, a rodless cavity end cover 10, an inner cylinder (oil cavity) 11, an oil outlet 12, an oil channel 13, a core mold (outer cylinder) 14, a rodless end cover 15, a one-way valve 16, a gear front cover 17, and a gear rear cover 18.

[0023] like Figure 2 and 3 As shown, when not working, the tail top 1 is located above the piston rod 2. When oil needs to be replenished, the tail top 1 moves downward and is connected and fixed to the piston rod 2 through a key connection. The two will not move relative to each other. The tail top 1 pushes the piston rod 2 to move downward, and at the same time compresses the spring 7 fixed at the lower end of the sleeve 5 and the upper end of the piston 8. Then the tail top 1 returns to the initial position, and the connection between the piston 8 and the piston rod 2 adopts a nut-type connection method, thereby driving the piston 8 to move. At this time, the spring 7 begins to recover its deformation from the stretched state, providing an upward rebound force for the movement of the piston 8, realizing upward movement to absorb oil; the lubricating oil is input into the oil chamber 13 through the one-way valve 16 connected to the end of the piston rod 2 (hollow rod), completing the oil replenishment. The planetary gears in the planetary gearbox 3 are connected to the base through a shaft, and the base is connected to the upper end cover 6 of the sliding sleeve through bolts. The inner cylinder 11 and the upper end cover 6 of the sliding sleeve are connected by studs, driving the inner cylinder 11 to rotate so that it has a certain speed; the outer cylinder (core mold) 14 is connected to the main shaft and rotates together so that it has a certain speed. Therefore, during the spinning process, the inner and outer cylinders move relative to each other at a certain speed ratio. When the oil outlet of the oil channel 13 and the outer cylinder 14 are not aligned, the oil chamber pressurizes the oil channel through the one-way valve 16. When the spinning starts, the oil channel is aligned with the oil outlet of the outer cylinder and the lubricating oil is discharged through the oil pressure, thereby achieving the required lubrication purpose.

[0024] like Figure 3 Schematic diagram of the inner tube structure and Figure 4As shown in the overall axonometric view of the internal working structure of the core mold, there is a certain gap between the inner cylinder 11 and the core mold 14 and the piston rod 2 is axially matched. The oil channel 13 is fitted with the inner surface of the core mold 14, and the tail top 1 pushes the piston rod 2 to move downward to discharge oil to lubricate the workpiece. It can be seen that the piston rod is hollow, and an oil channel is added to the tail top 1 at the point where its head is connected to the tail top. The piston 8 moves up and down in the inner cylinder 11. Because there is a one-way valve 16 at the bottom of the oil chamber and the end of the piston rod to control the flow direction of the oil, when the piston 8 moves upward under the action of the spring 7, the oil outlet 12 is in a closed state and a sealing ring is provided to prevent oil from leaking out. Since the pressure in the oil chamber 11 is reduced, the lubricating oil enters the oil chamber through the oil channel in the piston rod 2 and the one-way valve 16, storing a certain amount of lubricating oil to ensure the supply of lubricating oil during the spinning process.

[0025] like Figure 5 This is a top view of the inside of the spinning core mold. It can be seen that most of the parts are cylindrical or annular structures, and the connection method is mostly threaded nuts. The hollow piston rod 2 passes through the mold and is one of the important parts for transporting lubricating oil. It can also be clearly seen that the oil outlet 12 and the outer cylinder (core mold) 14 have a clearance fit. Figure 6 The planetary gearbox is the transmission device of the mold. The internal structure has the sun gear at the center, and the planetary gears rotate around the sun gear. At the same time, the planetary gears also rotate around the axis of the sun gear along with the planetary carrier. The ring gear meshes with the planetary gears to form a complete planetary gear system. By adjusting the number of teeth on the planetary gears and the motion state of the planetary carrier, different transmission ratios and transmission directions can be achieved. It is possible to achieve relative movement speeds between the inner and outer barrels, and the speed ratio is constant. Figure 7 The sleeve structure features a threaded connection between the sleeve's upper end cap and the sleeve, securing the piston rod. Seals are located inside and outside the sleeve to prevent oil leakage during operation. Installing the sleeve isolates the friction surface from the machine components, reducing friction and wear, and increasing the efficiency and service life of the piston rod.

[0026] Mechanical working process of the present invention:

[0027] Spinning is a process in which the blank is fixed to the end of the spinning machine mold with a top block, and the device is rotated together by a motor. After reaching a certain rotation speed, the rotating wheel starts to squeeze the blank from the end, causing the blank to gradually deform. Through continuous plastic deformation, it is formed into a part with a similar shape to the mold, and finally all are formed into a hollow part. The automatic lubrication core mold spinning mold designed in this way can automatically add lubricating oil to the required areas during the spinning process, complete the lubrication between the blank and the core mold, and improve the quality of spinning. This mold has oil channels, oil inlets, oil outlets, oil chambers and other devices. The oil chamber is placed inside the mold, and then the oil is accurately added to the required areas through a certain speed ratio between the inner and outer barrels. This design makes up for the shortcomings of traditional lubricating oil addition. Lubricating oil can be accurately added to the required processing areas, allowing the lubricating oil to be fully used. For manual labor, the workload during the spinning process is reduced.

[0028] The core mold device is fixed to the main shaft of the spinning equipment. Before the piston chamber is operated, a cylindrical blank is placed on the core mold. If the cavity is low on oil, an oil replenishment action is performed. The tail pin 1 moves downward to connect with the piston rod 2, compressing the spring 6. The tail pin then moves upward to the initial processing position, at which point the piston is flush with the roller. At this time, the spring 6 begins to deform from its stretched state, and the piston 8 is reset by the spring, allowing it to move upward to absorb oil. Lubricating oil is then pumped into the oil chamber 13 through a one-way valve 16 connected to the end of the piston rod 2, completing the oil replenishment. As the main shaft rotates, the roller squeezes the blank. The tail pin 1 moves axially in sync with the roller, depressing the core mold piston rod 2 and moving downward to discharge oil to lubricate the workpiece. The bottom of the outer cylinder (core mold) 14 is connected to the main shaft and rotates together. The planetary gear carrier is connected to the core mold inner cylinder and rotates together. The piston rod 2 and the tail pin 1 are connected by an interface and do not rotate. Therefore, during the spinning process, the inner and outer cylinders move relative to each other at a specific speed ratio, and the lubricating oil is accurately squeezed through the channel to the contact surface between the core mold and the blank at a specific cycle. After the workpiece is spun to the target size, the spindle stops, the spinning wheel and tailpiece are withdrawn, the mold is removed, and the processing is completed.

Claims

1. An automatic lubricating core mold spinning mold, characterized in that: The upper end of the planetary gearbox is connected to the sun gear, the base, the planetary gear and the inner gear are connected to the sun gear, and the planetary gear rotates around the sun gear. The cover is fixed by bonding, the piston rod and the sun gear axially cooperate, the planetary gear is connected to the base through the shaft, the base is connected to the upper end cover of the sleeve by bolts, the upper end cover of the sleeve and the inner cylinder are connected by studs, so that the planetary gearbox can drive the inner cylinder to rotate, the piston rod passes through the sleeve, which adjusts or limits the range of movement during movement, and there are inner and outer sealing rings on the sleeve to prevent leakage of lubricating oil. The connection between the piston and the tail of the piston rod adopts a nut-type connection method. There are 2 sealing rings on the piston to prevent oil leakage during operation. The lower end of the sleeve is connected to one end of the spring by bonding, and the other end of the spring is connected to the upper end face of the piston by bonding. The piston can move up and down through the elastic deformation of the spring. The end of the piston rod is also threadedly connected to a one-way valve that controls the flow direction of the oil to divert the lubricating oil, thereby allowing the lubricating oil to be stored in the inner cylinder.

2. The automatic lubricating core mold spinning mold according to claim 1 is characterized in that: The lower end of the inner cylinder is fixed to the rodless cavity end cover by a stud, and the upper end of the inner cylinder is connected to the upper end cover of the sliding sleeve by a stud. The lower end of the inner cylinder is provided with an oil outlet, which is connected to a one-way valve. When the piston moves downward, the lubricating oil stored in the inner cylinder can be discharged to the oil channel on the outer wall of the inner cylinder through the one-way valve.

3. The automatic lubricating core mold spinning mold according to claim 1 or 2, characterized in that: The oil channel fits the inner surface of the outer tube. When the oil channel and the oil outlet of the outer tube are not aligned, the inner tube pressurizes and delivers lubricating oil into the oil channel through a one-way valve. When spinning starts, the oil channel and the oil outlet of the outer tube are aligned and the lubricating oil is discharged through oil pressure, thereby achieving the required lubrication purpose.

4. The automatic lubricating core mold spinning mold according to claim 1, characterized in that: The outer cylinder is fixed to the rod end cover and the rodless end cover at the upper and lower ends of the outermost side by bolts respectively. The oil outlets distributed in an array on the outer cylinder cooperate with the oil channels on the inner cylinder to realize the lubricating oil transportation and processing materials in all directions.

5. The automatic lubricating core mold spinning mold according to claim 1, characterized in that: The planetary gearbox makes the inner and outer cylinders have relative motion speed, and the planetary gearbox makes the oil channel rotate and evenly distribute around the core mold, cooperating with the oil channel to achieve the purpose of adding lubricating oil at the required position.

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