A processing device for powder molding to manufacture pipes

Abstract

The present invention discloses a processing device for manufacturing pipes by powder molding, which is characterized by including a tubular outer mold and an inner mold. Upper and lower mold covers with grooves are provided at both ends of the outer mold. An elastic outer mold is arranged inside the outer mold, and a cavity filled with polytetrafluoroethylene powder is formed between the elastic outer mold and the inner mold, and a cavity is left between the groove and the end face of the inner mold. The processing device for manufacturing pipes by powder molding according to the present invention is provided with an upper mold cover with a groove. By cooperating the inner mold and the outer mold to fill powder, a pipe part with a flange is manufactured. And through the movement of the inner mold that can move relative to the outer mold, the pressure of the elastic outer mold on the polytetrafluoroethylene powder can be all-round and without dead angles. The manufactured flange straight pipe has excellent structure and superior performance. The device adopting this solution has high production efficiency and simple process, and at the same time avoids the defects and problems at the connection corners of manufacturing flange pipes in the prior art.

Description

Technical Field

[0001] The present invention relates to the field of powder molding technology, and relates to a processing device for powder molding to manufacture pipes. Background Art

[0002] F4 is one of the most corrosion-resistant materials in the world today, and it is absolutely clean and non-toxic. F4 pipes and F4-lined products such as reactors, towers, storage tanks, etc. are also widely used in the chemical industry and food production. The uses of F4 products are very extensive. If mass-produced and applied, it will replace the traditional heaters that have been used for many years. Not only will many new processes and high-benefit projects with high-temperature and strong-corrosion reactions that have not been solved before be successfully launched, but the production speed of existing enterprises will also be greatly accelerated, with a substantial increase in production and super value, obtaining huge economic benefits.

[0003] Currently, the pipes made of polytetrafluoroethylene are generally only straight pipes, or the process steps of adding flanges at both ends after the first production are used to manufacture straight pipes with flanges. In the traditional process, there is also a scheme of directly pressing and forming pipes with flanges at one time. However, the traditional pressing process is not only complex, but also due to the imperfection of the existing technology, the pipes produced often have imperfections at the connection corners of the flanges and the straight pipes due to pressure problems, and there are defects such as easy fracture and damage, which affect the use. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems of complex process for manufacturing pipes with flanges and insecure connection corners in the prior art, and to provide a processing device for powder molding to manufacture pipes, which can form and compress pipes with flanges at one time and avoid the defects of the flange pipes manufactured by the traditional process.

[0005] The present invention provides a processing device for powder molding to manufacture pipes, which is characterized in that: it includes a tubular outer mold, an inner mold sleeved inside the outer mold, and an upper mold cover and a lower mold cover are respectively arranged at both ends of the tube. An elastic outer mold is closely arranged on the inner wall of the outer mold, and a mold cavity for filling polytetrafluoroethylene powder is formed between the elastic outer mold and the inner mold. A groove adapted to the inner mold is arranged on the upper mold cover, and a cavity is left between the groove and the end face of the inner mold. The outer mold and the lower mold cover are densely provided with through holes. The elastic outer mold is U-shaped, and a circular flanging is arranged at the open end and the flanging fits the end face of the outer mold. A feeding ring is also arranged between the upper mold cover and the outer mold, and the inner ring of the feeding ring abuts against the outer side of the flanging of the elastic outer mold and is hermetically arranged after the two abut.

[0006] As a further setting of the above solution, it further includes a positioning inner template. The positioning inner template is U-shaped, its outer side abuts against the inner wall of the elastic outer mold, and a slot is arranged in the middle position. The diameter of the slot is adapted to the diameter of the inner mold.

[0007] As a further setting of the above solution, a sealing fit is provided at the place where the feeding ring abuts against the elastic outer mold.

[0008] As a further setting of the above solution, the inner mold can move relative to the upper mold cover along the groove, and its moving stroke is equal to the size of the cavity.

[0009] The processing device of the present invention adopts the method of cold isostatic pressing to compress polytetrafluoroethylene powder into a flange straight pipe. Through a clever design, the inner mold can move relative to the outer mold, and under the pressure of the cold isostatic pressing equipment during pressing, the powder at the flange position is further compressed axially, and secondly, through the movement of the inner mold, the flange pipe is compressed more tightly.

[0010] Beneficial effects of the solution of the present invention compared with the prior art: The pipe processing device of the present invention manufactures pipes with high pressure resistance and negative pressure resistance through the method of cold isostatic pressing. Its manufacturing process is simple and efficient, and through a clever design, the movement of the mold and the conduction of pressure are changed, so that the flange pipe is formed and compressed in one step, avoiding the cumbersome secondary processing and the gaps left by the reconnection. Secondly, through the clever design of the movement of the inner mold, it avoids the problem that the material at the connection corner of the traditional pipe with a flange is lacking, the depression is too large, and the arc is not perfect after the pipe is manufactured. The technical solution of the present invention has a simple manufacturing process, convenient operation, high working efficiency compared with the prior art, and the manufactured products have excellent appearance and performance, and a relatively longer service life. Description of the Drawings

[0011] Figure 1 It is a structural schematic diagram of this solution;

[0012] Figure 2 It is a partial structural schematic diagram of the pipe manufactured by this solution;

[0013] Figure 3 It is a schematic diagram of a pipe manufactured by the prior art.

[0014] Description of the Drawings: 1. Outer mold; 11. Elastic outer mold; 111. Flange; 2. Inner mold; 3. Upper mold cover; 31. Groove; 32. Cavity; 4. Lower mold cover; 6. Mold cavity; 8. Positioning inner template. Detailed Embodiments

[0015] In order to more clearly understand the above objects, features and advantages of the present invention, the present invention will be further described in detail below with reference to the drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0016] Such as Figures 1-3A processing device for powder molding to make pipes is characterized in that: it includes an outer mold 1 in the shape of a tube, and an inner mold 2 sleeved inside the outer mold 1. The inner mold 2 can be set to have an inner cavity or be solid. Upper mold covers 3 and lower mold covers 4 are respectively arranged at both ends of the outer mold 1. The lower mold cover 4 can be relatively fixed to the outer mold 1 by bolts. An elastic outer mold 11 is closely arranged on the inner wall of the outer mold 1. The elastic outer mold 11 is in a U shape with the opening facing upwards. The inner mold 2 is inserted into the elastic outer mold 11 through the opening, and after the insertion, a mold cavity 6 for filling polytetrafluoroethylene powder is formed between the elastic outer mold 11 and the inner mold 2. A groove 31 adapted to the inner mold 2 is arranged on the upper mold cover 3, and a cavity 32 is left between the groove 31 and the end face of the inner mold 2. The cavity 32 allows the inner mold 2 to move up and down under an external force. Through holes for the hydraulic water of the cold isostatic pressing equipment to pass through are densely arranged on the outer mold 1 and the lower mold cover 4. A circular flanging 111 is arranged at the open end of the elastic outer mold 11. The flanging 111 extends horizontally for a section and then extends downward relative to the horizontal direction for a section. The formed folding groove of the flanging 111 fits the outer mold 1. A feeding ring 7 is also arranged between the upper mold cover 3 and the outer mold 1, and it can also be relatively fixed to the outer mold 1 by bolts in the same way as the lower mold cover 4. The inner ring of the feeding ring 7 abuts against the outside of the flanging 111 of the elastic outer mold 11 to achieve sealing.

[0017] Through the above scheme setting, after the mold cavity 6 is filled with polytetrafluoroethylene powder and the mold is closed and placed in the cold isostatic pressing equipment, its internal is a sealed space. When the cold isostatic pressing equipment is started, the external pressure presses the hydraulic water through the through holes, and makes the elastic outer mold 11 deform under force to compress the internal polytetrafluoroethylene powder to form a pipe. The elastic outer mold 11 at the lower mold cover 4 deforms to push the inner mold 2 to move upward, and at the same time compresses the polytetrafluoroethylene powder from directly below, avoiding the defects of the sintered final product caused by insufficient pressure as shown in the appendix Figure 3 shown.

[0018] As a further setting of the above scheme, it further includes a positioning inner template 8. The positioning inner template 8 is in a U shape and its outer side abuts against the inner wall of the elastic outer mold. A slot is arranged in the middle position, and the diameter of the slot is adapted to the diameter of the inner mold 2.

[0019] Through the above setting, the positioning inner template 8 has two functions. One is to position the inner mold 2, and the other is that when the elastic outer mold 11 at the bottom deforms under pressure, it can press the inner mold 2 and the polytetrafluoroethylene powder stably under its pressure.

[0020] As a further setting of the above scheme, the feeding ring 2 and the elastic outer mold 11 are in sealing fit at the abutting place.

[0021] As a further setting of the above scheme, the inner mold 2 can move relative to the upper mold cover 3 along the groove 31, and its moving stroke is equal to the size of the cavity.

[0022] With the setup of the above solution, the processing device of the present invention preferably adopts the method of cold isostatic pressing to press the polytetrafluoroethylene powder into a straight pipe under pressure. Its main improvement is the provision of a groove 31 and a cavity 32, enabling the inner mold 2 to move relative to the outer mold 1 under the equipment pressure. When the mold of the present invention is pressed, the whole is under the pressure of the cold isostatic pressing equipment to further press the powder at the flange position axially. Through the movement of the inner mold 2, the flange pipe is pressed more tightly and the performance of the product is better.

[0023] The pipe processing device of the present invention manufactures high-pressure-resistant and negative-pressure-resistant pipes by the method of cold isostatic pressing. Its manufacturing process is simple and efficient. Moreover, through a clever design, the movement of the mold is changed, enabling it to form and press the flange pipe in one step, eliminating the cumbersome secondary processing and the gaps left by reconnection. Secondly, through the clever design of the movement of the inner mold, it avoids the problems of excessive material shortage and imperfect arc at the connection corner of the traditional flange-equipped pipe after production. The technical solution of the present invention is simple in manufacturing process, convenient to operate, and high in work efficiency compared with the prior art. Moreover, the manufactured products are superior in appearance and performance and have a relatively longer service life.

[0024] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications once they learn the basic creative concept. Therefore, the appended claims are intended to be construed as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0025] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims

1. A processing device for powder molding to produce pipes, characterized in that: It includes a tubular outer mold (1) and an inner mold (2) sleeved inside the outer mold (1). Upper mold covers (3) and lower mold covers (4) are respectively arranged at both ends of the tube. An elastic outer mold (11) is closely arranged on the inner wall of the outer mold (1). A mold cavity (6) for filling polytetrafluoroethylene powder is formed between the elastic outer mold (11) and the inner mold (2). A groove (31) adapted to the inner mold (2) is arranged on the upper mold cover (3), and a cavity (32) is left between the groove (31) and the end face of the inner mold (2). The outer mold (1) and the lower mold cover (4) are densely provided with through holes. The elastic outer mold (11) is U-shaped, and an annular flange (111) is arranged at its open end and the flange (111) fits the end face of the outer mold (1). A feeding ring (7) is also arranged between the upper mold cover (3) and the outer mold (1). The inner ring of the feeding ring (7) abuts against the outside of the flange (111) of the elastic outer mold (11), and after the two abut, they are hermetically arranged; The inner mold (2) can move relative to the upper mold cover (3) along the groove (31), and its moving stroke is equal to the size of the cavity.

2. The processing device for powder molding to produce pipes according to claim 1, characterized in that: It further includes a positioning inner template (8). The positioning inner template (8) is U-shaped and its outside abuts against the inner wall of the elastic outer mold. A slot is arranged in the middle position, and the diameter of the slot is adapted to the diameter of the inner mold (2).

3. The processing device for powder molding to produce pipes according to claim 1, characterized in that: The processing device includes compacting the polytetrafluoroethylene powder filled inside by means of dry bag isostatic pressing or wet bag isostatic pressing. When using wet bag isostatic pressing, a sealed fit should be maintained between the feeding ring (7), the upper mold cover (3) and the elastic outer mold (11).

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