Reducing eccentric pipe die forging tool

Abstract

The utility model discloses a die forging tool for a reducing eccentric pipe. The die forging tool comprises a top plate, a baffle, a punching plate, a punch, a spring, a guide column, a lower die, a positioning pressing plate and an ejector rod. The top plate is located over the lower die, two guide holes are formed in the lower die, two guide columns are arranged on the top plate, and the guide columns are inserted into the corresponding guide holes respectively. A die cavity is formed in the center of the lower die, a baffle is arranged at the top of the die cavity, a punch hole is formed in the center of the baffle, the punch extends into the die cavity through the punch hole of the baffle, and an ejector rod is arranged at the bottom of the die cavity; four spring holes are formed in the periphery of the punching plate and used for protecting the effectiveness of the springs. A punch is fixedly installed on the bottom face of the top plate and used for being matched with the cavity to achieve die forging. The device is simple in structure, convenient to operate, capable of achieving easy demolding of the different-diameter eccentric shaft, high in precision and capable of improving the material utilization rate at the same time.

Description

Technical Field

[0001] This utility model belongs to the category of hot forging tooling, specifically relating to a die forging tooling for eccentric tubes with different diameters. Background Technology

[0002] Eccentric reducing pipes are widely used in water supply and drainage engineering, industrial piping systems, municipal engineering, and sewage treatment systems. They reduce fluid velocity, lower pressure, and decrease noise. Eccentric pipes are mainly used in oil pipeline interfaces and pressure pipeline interfaces. Traditionally, they are produced by casting, which results in high material waste, low raw material utilization, high labor intensity, and low production efficiency. However, with industrial development, there is a need for high-strength eccentric reducing pipes capable of withstanding high pressure. Forging eccentric reducing pipes uses forging and extrusion molding, solving the problems of material waste, high cost, and inconvenient installation. However, the forging process often requires a multi-directional forging machine. Since our factory lacks a multi-directional forging machine, the technological challenge lies in the difficulty of expanding the hole and demolding. This needs to be compensated for and improved through mold design. Furthermore, this product is non-rotating, with different inner and outer diameters, requiring high positioning and precision. Therefore, reasonable mold design is a decisive factor in the manufacture of eccentric reducing pipes in our factory. Summary of the Invention

[0003] To solve the above-mentioned technical problems, this utility model provides a die forging fixture for eccentric tubes with a simple structure, convenient operation, easy demolding of eccentric tubes with different diameters, high precision, and improved material utilization.

[0004] The technical solution adopted in this utility model is as follows: A forging fixture for eccentric tubes with different diameters, characterized in that it includes a top plate, a baffle plate, a punch plate, a punch, a spring, a guide post, a lower die, a positioning pressure plate, and an ejector rod; the top plate is located directly above the lower die, the lower die has two guide holes, the top plate has two guide posts, and the guide posts are respectively inserted into the corresponding guide holes; a die cavity is provided at the center of the lower die, a baffle plate is provided at the top of the die cavity, a punch hole is provided at the center of the baffle plate, the punch extends into the die cavity through the punch hole of the baffle plate, an ejector rod is provided at the bottom of the die cavity, and the punch and the punch plate are connected by bolts on the bottom surface of the top plate, the punch is used to cooperate with the die cavity to realize the die.

[0005] Furthermore, the outer periphery of the punch plate is provided with three spring holes, which are mainly used to protect the effectiveness of the spring and ensure that the compressive load is within the pressure range that the spring can withstand.

[0006] Furthermore, the top plate has multiple "T"-shaped bolt holes arranged in a row at its upper end, and the top plate punch plate and the punch head punch plate are fixed to the top plate by bolts, and the punch head is fixed to the bottom surface of the punch plate.

[0007] Furthermore, it also includes a positioning plate, wherein the bottom of the lower mold is provided with a positioning flange, the positioning plate is provided with a mounting hole, and the bottom of the mounting hole is provided with a positioning groove; the lower mold is placed in the mounting hole, and the positioning groove cooperates with the positioning flange.

[0008] Furthermore, the top plate is provided with 4 bolt holes I, and the positioning pressure plate is provided with 4 bolt holes II.

[0009] Furthermore, the top of the ejector bar is provided with a flange, the diameter of which is larger than the diameter of the ejector bar hole at the bottom of the mold cavity, and the flange is located inside the mold cavity.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] 1. The top plate, punch plate, and punch of this utility model are fixed and positioned by internal hex bolts; the lower die and the top plate are positioned and guided by guide posts. This structure is simple to manufacture, easy to operate, accurate in positioning and guiding, and not prone to mold misalignment.

[0012] 2. The top plate and positioning pressure plate of this utility model are provided with four bolt holes I and four bolt holes II, which are connected to the upper and lower mold bases by bolts respectively. This structure is convenient for loading, unloading and adjustment.

[0013] 3. The top of the ejector rod of this utility model is provided with a flange, which disperses the impact force, makes the ejector rod less prone to deformation, and facilitates demolding.

[0014] 4. The combination of top plate, baffle and spring in this utility model enables automatic demolding of eccentric tube forgings with different diameters, which facilitates demolding of eccentric tube forgings with different diameters.

[0015] 5. This utility model can be used for forgings of different sizes by simply changing the punch, lower die, and baffle. For forgings of the same size, only the punch and lower die need to be changed to put them into production. It has strong versatility and can save a lot of mold manufacturing and maintenance costs. Attached Figure Description

[0016] Figure 1 This is a structural diagram of the present invention.

[0017] Figure 2 This is a front view of the top plate of this utility model.

[0018] Figure 3 This is a top view of the top plate of this utility model.

[0019] Figure 4 This is a schematic diagram of the structure of the baffle of this utility model.

[0020] Figure 5 This is a schematic diagram of the structure of the lower mold produced by this utility model.

[0021] Figure 6 This is a schematic diagram of the structure of the forging produced by this utility model. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings.

[0023] like Figure 1-5 As shown, this utility model includes a top plate 1, a punch plate 2, a spring 3, a baffle 4, a punch 5, a guide post 6, a lower die 8, a positioning pressure plate 9, and an ejector rod 10.

[0024] The top plate 1 is located directly above the lower mold 8. The top plate 1 is circular, and four bolt holes 1 are provided near the edge of the top plate for connecting the upper mold base. The top plate 1 has three T-shaped bolt holes 12 arranged in a row, which connect the punch plate 2 and the punch 5 through bolts. The top surface of the punch 5 is in contact with the bottom surface of the punch plate 2, and the top surface of the punch plate 2 is in contact with the bottom surface of the top plate 1.

[0025] The lower mold 8 has an annular boss on its top sidewall, with two guide holes on the boss. The axis of the guide holes is parallel to the axis of the lower mold 8. Two guide pillars 6 are fixedly installed on the top plate 1 with screws, and the two guide pillars 6 are inserted into the corresponding guide holes. The guide pillars 6 are provided to ensure that the top plate can move along the axis of the lower mold 8. A mold cavity is provided at the center of the lower mold 8, and a baffle 4 is provided at the top of the mold cavity. A punch hole is provided at the center of the baffle 4, and a punch 5 extends into the mold cavity through the punch hole. The punch 5 can cooperate with the cavity to achieve die forging. Multiple springs 3 are provided between the top surface of the baffle 4 and the bottom surface of the top plate 1. The two ends of the springs 3 are connected to the top surface of the baffle 4 and the bottom surface of the top plate 1, respectively. The punch plate 2 has through holes for the springs to pass through. An ejector rod 10 is provided at the bottom of the mold cavity. The top of the ejector rod 10 has a flange with a diameter larger than the diameter of the ejector rod hole at the bottom of the mold cavity. The flange is located inside the mold cavity. The top of the ejector rod 10 is provided with a flange, which disperses the impact force, making the ejector rod less prone to deformation and facilitating demolding.

[0026] The lower mold 8 has a positioning flange at its bottom, and the positioning plate 9 has a mounting hole with a positioning groove at the bottom. The lower mold 8 is placed in the mounting hole, and the positioning groove mates with the positioning flange. The positioning plate is circular, and four bolt holes II91 are provided on the positioning plate 9 near its outer circle for connecting the lower mold base with bolts.

[0027] When using this utility model, the process is as follows: first, induction heating; then, billet preparation; and finally, die forging.

[0028] ① The billet to be produced is heated in a medium-frequency induction heating furnace to a temperature of approximately 1180℃ for 5 minutes; ② The top plate 1 is connected to the upper mold base, the positioning pressure plate 9 is connected to the lower mold base, and the ejector rod 10 is connected to the hydraulic cylinder; the billet is placed in the mold cavity of the lower mold 8, the billet is adjusted, the press is started, the slider drives the top plate 1 to press down, and the compressed spring rebounds against the baffle, causing the forging 7 to separate from the punch 5, realizing one forging process. ③ After the forging 7 is formed, the hydraulic ejection switch is activated, and the hydraulic cylinder drives the ejector rod 10 to eject the forging 7 out of the mold cavity of the lower mold 8.

Claims

1. A die forging fixture for eccentric tubes with different diameters, characterized in that: The assembly includes a top plate, a baffle plate, a punch plate, a punch, a spring, guide pillars, a lower die, a positioning pressure plate, and an ejector rod. The top plate is located directly above the lower die. The lower die has two guide holes, and the top plate has two guide pillars that are inserted into their respective guide holes. A die cavity is located at the center of the lower die, and a baffle plate is located at the top of the die cavity. A punch hole is located at the center of the baffle plate, and the punch extends into the die cavity through the punch hole in the baffle plate. An ejector rod is located at the bottom of the die cavity. The punch and the punch plate are connected to the bottom surface of the top plate with bolts. The punch is used to cooperate with the die cavity to achieve die forging.

2. The forging fixture for eccentric tubes with different diameters according to claim 1, characterized in that: It also includes a punch plate with three spring holes around its perimeter, which are mainly used to protect the effectiveness of the spring and ensure that the compressive load is within the pressure range that the spring can withstand.

3. The forging fixture for eccentric tubes with different diameters according to claim 1, characterized in that: The top plate has multiple "T"-shaped bolt holes arranged in a row. The top plate punch plate and the punch head punch plate are fixed to the top plate by bolts, and the punch head is fixed to the bottom surface of the punch plate.

4. The forging fixture for eccentric tubes with different diameters according to claim 1, characterized in that: It also includes a positioning plate, the bottom of the lower mold is provided with a positioning flange, the positioning plate is provided with a mounting hole, and the bottom of the mounting hole is provided with a positioning groove; the lower mold is placed in the mounting hole, and the positioning groove cooperates with the positioning flange.

5. The forging fixture for eccentric tubes with different diameters according to claim 4, characterized in that: The top plate has four bolt holes I, and the positioning plate has four bolt holes II.

6. The forging fixture for eccentric tubes with different diameters according to claim 1, characterized in that: The top of the ejector bar is provided with a flange, the diameter of which is larger than the diameter of the ejector bar hole at the bottom of the mold cavity, and the flange is located inside the mold cavity.

Images