Movable elbow blank bending die

Abstract

The utility model discloses a movable elbow blank bending die. The movable elbow blank bending die mainly comprises an upper die base, a female die plate, a lower die base, a cushion block, a male die plate and the like. A material pushing assembly and a lubricating assembly are arranged on the male die plate, and an oil pumping assembly in the lubricating assembly is in linkage with the upper die plate to achieve automatic oil pumping. The oil pumping assembly comprises a piston cylinder, a piston rod and the like, and lubricating oil can be accurately conveyed between a blank and a material pushing plate through a main oil channel and an auxiliary oil channel before bending. And the material pushing assembly pushes the formed part out of the convex mold plate through a guide column, a push plate and the like. In addition, the pushing plate is provided with an oil groove and an oil receiving groove, and the oil receiving groove can recycle lubricating oil to an oil tank for recycling. According to the die, through cooperation of all the assemblies, manual participation is reduced, efficient automatic lubricating and discharging are achieved, the production efficiency and the product quality are improved, the cost is reduced, and good practicability and economical efficiency are achieved.

Description

Technical Field

[0001] This utility model relates to the field of petroleum equipment processing technology, specifically to a bending die for a movable elbow blank. Background Technology

[0002] In the oil industry, movable elbows are a critical component, primarily used to change pipeline direction, reduce stress caused by temperature variations and pressure fluctuations, and adapt to complex terrain and spatial layouts. Their flexibility simplifies pipeline installation and maintenance, while extending the service life of pipeline systems by reducing stress concentration and wear. Movable elbows are widely used in drilling platforms, oil pipelines, and refineries to ensure the reliability and stability of pipeline systems under various operating conditions.

[0003] In the prior art, a bending die for a movable elbow blank, disclosed in publication number "CN214601449U", is described. The upper die base has a flange at its top, which is connected to the traveling assembly of a forging press. The upper die base contains a die cavity A, which is an inwardly convex structure. A positioning pin is located at the bottom of the upper die base, and the positioning pin engages with a positioning groove. The positioning groove is located at the top of the lower die base, which contains a die cavity B, which is an inwardly concave structure. A positioning component is integrally formed at the bottom of the lower die base and is connected to the forging die base. The advantages of this invention are: it optimizes the production process, achieving uniform wall thickness in the stretching portion of the movable elbow during bending, while uniformly increasing the wall thickness of the stretching portion, reducing the need for drilling or machining eccentric holes, and increasing the bending process; it increases the wall thickness of the stretching portion of the movable elbow, reduces the wall thickness of the bending and extrusion portion, optimizes the bending channel, and increases the service life of the movable elbow.

[0004] However, existing technologies still have significant shortcomings, such as:

[0005] In existing technologies, the lubrication process of many molds relies on manual oil injection. Operators need to constantly monitor the progress of the bending operation and inject oil at the appropriate time. This not only distracts operators from other critical production processes, but the oil injection process itself is also time-consuming. Furthermore, manual oil injection makes it difficult to guarantee the accuracy and consistency of each injection. Different operators may have different grasps of the timing and amount of oil injection, and even the same operator may experience deviations due to fatigue or other factors after working for a long time. Injecting too much oil may waste lubricating oil and may also cause excess oil to contaminate the working environment, affecting subsequent processes; injecting too little oil will not provide sufficient lubrication for the mold and blank, resulting in quality problems such as scratches and deformation on the product surface. Utility Model Content

[0006] The purpose of this utility model is to provide a bending die for movable elbow blanks to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A bending die for a movable elbow blank includes an upper die base, a concave die plate, a lower die base, a pad block, and a convex die plate. A guide sleeve is fixedly provided on the upper die base, a guide post is fixedly provided on the convex die plate, and a pusher assembly and a lubrication assembly are provided on the convex die plate.

[0009] The pusher assembly is used to push the formed part out of the convex template, and the lubrication assembly is used to apply lubricating oil to the blank.

[0010] Preferably, the material pushing assembly includes a plurality of guide posts fixedly mounted on the convex template, a push plate slidably mounted on the guide posts, a plurality of push rods fixedly mounted on the push plate, the push rods penetrating the convex template, a material pushing plate fixedly mounted on the push rods, and a plurality of positioning pins fixedly mounted on the material pushing plate.

[0011] Preferably, the lubrication assembly includes a pumping assembly fixedly mounted on the convex template. The pusher plate has several main oil passages and auxiliary oil passages. The auxiliary oil passages penetrate the pusher plate. The pumping assembly pumps oil into the main oil passages and auxiliary oil passages, so that the lubricating oil flows between the pusher plate and the blank.

[0012] Preferably, the pusher plate is further provided with an oil groove, the outline of which is the outer offset curve of the elbow product.

[0013] Preferably, an oil receiving groove is fixedly provided on the pusher plate.

[0014] Preferably, the pump assembly includes a piston cylinder fixedly mounted on a convex plate, a piston rod slidably mounted in the piston cylinder, the piston rod being hollow and communicating with the piston cylinder, and a liquid outlet pipe fixedly connected to the piston rod, the liquid outlet pipe being connected to the main oil passage through a pipeline;

[0015] A one-way valve is fixedly installed on the piston rod, and the one-way valve is connected to the piston rod.

[0016] A fixed plate is fixedly installed in the piston cylinder, and a one-way valve is also fixedly installed on the fixed plate. The one-way valve is connected to the piston cylinder, and an oil inlet pipe is fixedly connected to the piston cylinder.

[0017] Preferably, an oil tank is fixedly installed on the convex template, and the oil inlet pipe is connected to the oil tank through a pipeline.

[0018] Preferably, the oil receiving trough is connected to the oil tank via a pipeline.

[0019] Preferably, a spring is provided in the piston cylinder, the spring is used for piston rod reset, and a wear-resistant block is fixedly provided on the top of the piston rod.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] 1. The lubrication system automatically and evenly applies lubricating oil to the contact area between the blank and the mold during the bending process, effectively reducing the friction between them. This not only avoids defects such as scratches and wrinkles on the blank surface caused by friction, greatly improving the surface quality of the elbow parts and making them more in line with the requirements of high-quality products, but also reduces the deformation of the parts caused by uneven friction, improving the dimensional accuracy and consistency of the products.

[0022] 2. The oil pump is automatically triggered when the upper template is pressed down, eliminating the need for manual intervention and greatly reducing manpower. Simultaneously, it avoids issues of excessive or insufficient oil injection due to improper manual operation, ensuring consistent lubrication conditions during each bending process. This significantly reduces product quality fluctuations caused by human error and improves the product yield.

[0023] 3. After the elbow part is bent and formed, the pusher assembly can quickly and accurately push it out of the punch plate. The guide post provides precise guidance for the movement of the pusher plate, ensuring smooth and stable movement without deviation. The push rod works closely with the pusher plate to accurately transmit the movement of the pusher plate and powerfully push the part away from the punch plate. The positioning pin precisely positions the part during the pusher process, preventing it from shaking or misaligning during ejection, ensuring the accuracy and stability of unloading. The entire pusher process is efficient and orderly, completing the unloading action in a short time, saving time for the next production cycle and improving production efficiency.

[0024] 4. An oil collection groove is installed on the push plate to collect excess lubricating oil that overflows between the blank and the push plate during bending. This effectively prevents lubricating oil from dripping onto the worktable or splashing everywhere, keeping the mold working area and surrounding environment clean. A clean working environment not only helps extend the service life of the equipment and reduce equipment failures caused by oil contamination, but also reduces the probability of safety accidents such as operator slips and falls, creating a safe and clean working environment for operators and ensuring the smooth operation of the production process. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural diagram of the overall device of this utility model;

[0026] Figure 2 This is the front view of the present utility model;

[0027] Figure 3 This is a three-dimensional structural diagram of the pusher assembly of this utility model;

[0028] Figure 4 This is a three-dimensional structural diagram of the pump fluid assembly of this utility model;

[0029] Figure 5 This is a three-dimensional structural diagram of the pump fluid assembly of this utility model in the pressed state;

[0030] Figure 6 This is a schematic diagram of the main oil circuit of this utility model in the pusher plate.

[0031] In the diagram: 1. Upper mold base; 2. Concave mold plate; 3. Lower mold base; 4. Pad block; 5. Convex mold plate; 6. Guide sleeve; 7. Guide post; 8. Pushing assembly; 81. Guide post; 82. Push plate; 83. Push rod; 84. Pushing plate; 85. Positioning pin; 9. Lubrication assembly; 91. Pump assembly; 911. Piston cylinder; 912. Piston rod; 913. Liquid outlet pipe; 914. Check valve; 915. Fixed plate; 916. Oil inlet pipe; 917. Spring; 918. Wear-resistant block; 92. Main oil passage; 93. Auxiliary oil passage; 94. Oil placement groove; 95. Oil receiving groove; 10. Oil tank. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] Please see Figure 1-6 This utility model provides a technical solution:

[0034] The bending die for the elbow blank in this activity is mainly composed of upper die base 1, concave die plate 2, lower die base 3, pad block 4, and convex die plate 5. The components work closely together to complete the bending and shaping of the blank and subsequent processing.

[0035] The upper mold base 1 is located on the upper part of the mold and is connected to the power output end of the press through a specific installation method (such as bolt connection), enabling it to reciprocate up and down under the drive of the press. A guide sleeve 6 is fixedly installed on the upper mold base 1. The function of the guide sleeve 6 is to provide a precise guiding path for the up and down movement of the mold, ensuring the stability and accuracy of the mold's operation.

[0036] The punch plate 5 is positioned relatively below the mold and cooperates with the upper mold base 1. A guide post 7 is fixedly installed on the top of the punch plate 5, precisely fitting with the guide sleeve 6 of the upper mold base 1. When the press drives the upper mold base 1 to move up and down, the guide post 7 slides smoothly within the guide sleeve 6, ensuring high precision in the relative movement between the upper mold base 1 and the punch plate 5, laying a solid foundation for subsequent bending operations.

[0037] On the convex template 5, a pusher assembly 8 and a lubrication assembly 9 are fixedly installed.

[0038] The core component of the lubrication assembly 9 is the pump assembly 91, which is responsible for providing power and lubricating oil delivery for the entire lubrication process. The piston cylinder 911 in the pump assembly 91 is reliably mounted on the protruding plate 5 using methods such as bolting or welding. A piston rod 912 slides inside the piston cylinder 911. The piston rod 912 is designed as a hollow structure and communicates with the internal space of the piston cylinder 911, forming a channel for lubricating oil flow. On the side of the piston rod 912 near the pusher plate 84, an outlet pipe 913 is fixedly connected by welding or other methods. The outlet pipe 913 is further connected to the pre-machined main oil passage 92 on the pusher plate 84 via a pressure-resistant and well-sealed pipe.

[0039] A one-way valve 914 is installed on the piston rod 912. This one-way valve 914 is connected to the hollow part of the piston rod 912, allowing lubricating oil to flow from the piston cylinder 911 to the piston rod 912, while preventing reverse flow. Inside the piston cylinder 911, a fixed plate 915 is fixedly installed near the oil inlet end. A one-way valve 914 is also installed on the fixed plate 915. This one-way valve 914 is connected to the piston cylinder 911, and its function is to allow lubricating oil to flow only from the oil inlet side of the piston cylinder 911 into the side of the piston cylinder 911 connected to the piston rod 912, thereby ensuring unidirectional flow of lubricating oil within the pump assembly 91.

[0040] At the position where the piston rod 912 contacts the upper mold base 1, a wear-resistant block 918 is fixedly installed on the piston rod 912.

[0041] On the oil inlet side of the piston cylinder 911, an oil inlet pipe 916 is fixedly connected by welding or threaded connection. An oil tank 10 is fixedly installed on the protruding plate 5, and the other end of the oil inlet pipe 916 extends into the oil tank 10 to draw lubricating oil from the oil tank 10, providing an oil source for the entire lubrication process. The operator can control the appropriate piston rod stroke to control the pump oil flow.

[0042] When the press drives the upper die holder 1 to move downwards, the upper die holder 1 gradually approaches the punch plate 5. During this process, the upper die holder 1 presses against the piston rod 912. As pressure is applied, the one-way valve 914 in the piston rod 912 opens under pressure, while the one-way valve 914 in the piston cylinder 911 closes due to the pressure difference. In this state, the lubricating oil in the piston cylinder 911, pushed by pressure, enters the hollow part of the piston rod 912 through the one-way valve 914 on the fixed plate 915, and then flows smoothly to the main oil passage 92 in the pusher plate 84 through the open one-way valve 914 and the outlet pipe 913 on the piston rod 912. The main oil passage 92 has a specific distribution path inside the pusher plate 84 and is interconnected with multiple auxiliary oil passages 93. Lubricating oil flows from the main oil passage 92 into the secondary oil passage 93. Since the secondary oil passage 93 passes through the pusher plate 84, the lubricating oil is eventually discharged from the secondary oil passage 93 and flows evenly into the gap between the blank and the pusher plate 84. This forms a lubricating film at the key contact points between the blank and the mold, effectively reducing the friction generated during the subsequent bending process. This not only improves the surface quality of the part but also significantly extends the service life of the mold.

[0043] As the upper mold base 1 continues to move downwards, the concave mold plate 2 and the convex mold plate 5 approach each other and fit tightly together. Under the combined action of the two, the blank gradually undergoes plastic deformation under pressure and shape constraints, completing the bending forming process and becoming an elbow part that meets the design requirements.

[0044] When the upper die holder 1 completes the bending action and begins to return to its original position, the piston rod 912 also returns to its original position under the elastic action of the spring 917 inside the piston cylinder 911. At this time, the one-way valve 914 in the piston rod 912 closes under the combined action of gravity and changes in lubricating oil pressure, preventing lubricating oil from flowing out. Meanwhile, the one-way valve 914 in the piston cylinder 911 opens under the pressure difference due to changes in pressure inside the piston cylinder 911 (the upper die holder 1 rises, the space inside the piston cylinder 911 increases, and the pressure decreases). The lubricating oil in the oil tank 10 is drawn into the piston cylinder 911 through the oil inlet pipe 916 under the combined action of atmospheric pressure and the negative pressure inside the piston cylinder 911, fully preparing for the next lubrication operation.

[0045] The oil tank 10 is fixed to the convex template 5 and connected to the piston cylinder 911 via the oil inlet pipe 916, providing an oil source for the lubrication process. The pusher plate 84 has a main oil passage 92 and a secondary oil passage 93. The secondary oil passage 93 penetrates the pusher plate 84, and lubricating oil flows into the secondary oil passage 93 through the main oil passage 92, ultimately being evenly applied to the gap between the blank and the pusher plate 84. The pusher plate 84 also has an oil storage groove 94, whose outline is an outwardly offset curve of the elbow product, used to store lubricating oil. An oil receiving groove 95 is fixedly installed on the pusher plate 84, connected to the oil tank 10 via a pipe, used to recover excess lubricating oil.

[0046] The pusher assembly 8 mainly consists of guide posts 81, push plates 82, push rods 83, pusher plates 84, and positioning pins 85. Several guide posts 81 are vertically and securely fixed to the protruding template 5 via bolts or other means. The push plate 82 is fitted onto the guide posts 81, allowing for smooth up-and-down sliding along them while maintaining good sliding fit accuracy. Several push rods 83 are evenly distributed and fixed to the lower surface of the push plate 82 via welding or bolt fastening. The push rods 83 extend through the protruding template 5, and the pusher plate 84 is fixed to the lower end of the push rods 83 extending from the protruding template 5 via bolts or other means.

[0047] The pusher plate 84 directly contacts the formed elbow part and is the key component for realizing the pusher action. In order to ensure that the blank is positioned accurately and does not shift during the feeding process, several positioning pins 85 are fixedly installed on the pusher plate 84 by means of threaded connection or other means.

[0048] After the elbow part is bent and formed, and the upper die holder 1 returns to its initial position, the hydraulic rod of the press begins to function. The hydraulic rod pushes the push plate 82 upward, and the push plate 82, guided by the guide column 81, moves smoothly upward along the guide column 81. The movement of the push plate 82 drives the push rod 83 connected to it to move upward synchronously, and the push rod 83 in turn drives the pusher plate 84 to move upward. During the upward process, the pusher plate 84 smoothly pushes the formed blank off the punch plate 5, completing a complete working cycle of the bending die.

[0049] Working Principle: During use, when the press drives the upper die holder 1 downward, the upper die holder 1 presses the piston rod 912, opening the one-way valve 914 in the piston rod 912 and closing the one-way valve 914 in the piston cylinder 911. Lubricating oil, under pressure, flows into the main oil passage 92 through the outlet pipe 913, and then is evenly spread between the blank and the push plate 84 via the auxiliary oil passage 93, forming a lubricating film. When the upper die holder 1 returns to its original position and moves upward, the piston rod 912 returns to its original position under the action of the spring 917, closing the one-way valve 914 in the piston rod 912 and opening the one-way valve 914 in the piston cylinder 911. The lubricating oil in the oil tank 10 is drawn into the piston cylinder 911, preparing for the next lubrication cycle. After bending and forming, the hydraulic rod of the press pushes the push plate 82 upward along the guide column 81. The push plate 82 drives the push rod 83 and the push plate 84 upward, pushing the formed blank out of the punch plate 5, completing one work cycle.

[0050] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A bending die for a movable elbow blank, comprising an upper die base (1), a concave die plate (2), a lower die base (3), a pad block (4), and a convex die plate (5), characterized in that: A guide sleeve (6) is fixedly provided on the upper mold base (1), a guide post (7) is fixedly provided on the convex mold plate (5), and a pusher assembly (8) and a lubrication assembly (9) are provided on the convex mold plate (5). The pusher assembly (8) is used to push the formed part out of the convex template (5), and the lubrication assembly (9) is used to apply lubricating oil to the blank; The pusher assembly (8) includes a plurality of guide posts (81) fixedly mounted on the convex template (5), a push plate (82) slidably mounted on the guide posts (81), a plurality of push rods (83) fixedly mounted on the push plate (82), the push rods (83) penetrating the convex template (5), a pusher plate (84) fixedly mounted on the push rods (83), and a plurality of positioning pins (85) fixedly mounted on the pusher plate (84). The lubrication assembly (9) includes a pumping assembly (91) fixedly mounted on the protruding template (5). The pusher plate (84) has several main oil passages (92) and auxiliary oil passages (93). The auxiliary oil passages (93) penetrate the pusher plate (84). The pumping assembly (91) pumps oil into the main oil passages (92) and auxiliary oil passages (93), so that the lubricating oil flows between the pusher plate (84) and the blank. The pusher plate (84) is also provided with an oil groove (94), the outline shape of which is the outer offset curve of the elbow product; An oil receiving groove (95) is fixedly provided on the pusher plate (84); The pump assembly (91) includes a piston cylinder (911) fixedly mounted on the protruding template (5). A piston rod (912) is slidably mounted in the piston cylinder (911). The piston rod (912) is hollow and communicates with the piston cylinder (911). A liquid outlet pipe (913) is fixedly connected to the piston rod (912). The liquid outlet pipe (913) is connected to the main oil passage (92) through a pipeline. A one-way valve (914) is fixedly installed on the piston rod (912), and the one-way valve (914) is connected to the piston rod (912); A fixed plate (915) is fixedly installed in the piston cylinder (911), and a one-way valve (914) is also fixedly installed on the fixed plate (915). The one-way valve (914) is connected to the piston cylinder (911), and an oil inlet pipe (916) is fixedly connected to the piston cylinder (911).

2. The movable elbow blank bending die according to claim 1, characterized in that: An oil tank (10) is fixedly installed on the convex template (5), and the oil inlet pipe (916) is connected to the oil tank (10) through a pipeline.

3. The movable elbow blank bending die according to claim 2, characterized in that: The oil receiving tank (95) is connected to the oil tank (10) via a pipeline.

4. The movable elbow blank bending die according to claim 3, characterized in that: A spring (917) is provided in the piston cylinder (911), the spring (917) is used to reset the piston rod (912), and a wear-resistant block (918) is fixedly provided on the top of the piston rod (912).

Images