The invention provides a T-pipe bulging forming device and a forming method. The T-pipe bulging forming device at least comprises a mold, a pressure medium injection device, a pressure push head device, a pressure sensor, a displacement sensor and a controller, wherein the controller is electrically connected with the pressure sensor and the displacement sensor, and is also in control connection with the pressure push head device, a top cylinder device and a power module of the pressure medium injection device. On the one hand, improved design is performed on the structure of the T-pipe bulging forming device, so that the working efficiency and the cooperative continuity are effectively improved while requirements on the operation convenience and reliability are satisfied. The pressures and displacements of a pressure medium, a push head and a top cylinder are monitored and adjusted in real time. On the other hand, a T-pipe bulging forming process is improved, and a method that outwardbulging is performed on a forming part material of a branch pipe after in-pipe pre-stretching bulging is adopted, so that the thickness uniformity of the bulged wall of the branch pipe can be remarkably improved, the probability of fracture is low, and the limit bulging height of the branch pipe is effectively increased.

T-pipe bulging forming device and bulging forming method for branch pipe of T-pipe

The invention provides a surface machining device and method aiming at bending metal pipes of small specifications and relates to the field of metal pipes. The surface machining device aiming at bending the metal pipes of the small specifications is used for bending pipe bodies and comprises a working table, a placing groove, a bending mechanism, a supporting rod, a cable and multiple polishing mechanisms. The placing groove is formed in the working table. The bending mechanism is arranged on one side of the placing groove. According to the surface machining device aiming at bending the metalpipes of the small specifications, by means of cooperation of the cable, a fixing sleeve, a tiny electric pushing rod and a scraper, the whole polishing mechanism extends into the metal pipes to be bent. The function of filler is achieved, and the interiors can be stressed uniformly when the pipes are bent. After the pipes are bent, the cable is pulled to drive the scraper on the polishing mechanism to move while the scraper makes contact with pipe walls. Thus wrinkles generated on the inner walls of bent portions of the pipes are milled flatly, the effect of polishing the inner walls of the metal pipes of the small specifications is achieved, and the situation that due to existence of the wrinkles, the use effect of the pipes is influenced.

Surface machining device and method aiming at bending metal pipes of small specifications

The invention discloses a pipe blank pushing bending forming device and method. The pipe blank pushing bending forming device comprises a main rack, a hydraulic station, a control box, a die, a main pushing hydraulic cylinder and a top pushing hydraulic cylinder. The die is arranged on the main rack, and the die is provided with a forming hole way. The forming hole way is internally provided witha plurality of movable moving core blocks. Two pushing frames are hinged to the main rack, and a hydraulic motor and an encoder are arranged at the hinge positions of the pushing frames and the main rack. The main pushing hydraulic cylinder and the top pushing hydraulic cylinder are arranged on the two pushing frames correspondingly. The hydraulic motor, the main pushing hydraulic cylinder and thetop pushing hydraulic cylinder are in driving connection with the hydraulic station. The control box controls the hydraulic station. During work, a pipe blank is filled with elastic media, the pipe blank is placed in the die, the moving core blocks are placed in the die, a push rod of the main pushing hydraulic cylinder and a push rod of the top pushing hydraulic cylinder stretch into the two ends of the forming hole way correspondingly, and the pipe blank is pushed and bent to be formed. The pipe blank pushing bending forming device and method are suitable for the forming process of multiplebends different in bending degree, and universality and the machining efficiency are high.

Pipe blank pushing bending forming device and machining method thereof

The invention discloses a method for forming a pipe fitting with internal high pressure and external low pressure. The method comprises the steps that a pipe fitting to be formed is put into a cavity,a swelling region is formed between the pipe fitting to be formed and the inner wall of the cavity, low pressure fluid is continuously injected into the swelling region, then high pressure fluid is injected into the inner part of the pipe fitting to be formed, the high pressure fluid forms the pressure on the outer wall of the pipe fitting to be formed, so that the pipe fitting to be formed expands to the swelling region, when the pipe fitting expands to fit the inner wall of the cavity, supplying of the low pressure fluid is stopped, the formed pie fitting is taken out, and a working cycle is completed. The invention further discloses a forming machine, and the pipe fitting is formed according to the forming machine for a pipe fitting with internal high pressure and external low pressure. According to the method for forming a pipe fitting with internal high pressure and external low pressure, a first through hole and a second through hole are formed in a die for circulating the low pressure fluid into and out of the swelling region, a certain pressure P1 is formed for pipe fitting, so that it is guaranteed that the pipe fitting can swell uniformly everywhere, and a good forming effect is achieved.

Method for forming pipe fitting with internal high pressure and external low pressure and forming machine

The invention discloses an inner high-pressure tee-joint pipe wall thickness uniform forming method and device. The method comprises the following steps that a pipe corner is cut off at each of the two ends of a pipe blank; the straight pipe outer wall on the side where the pipe blank is not subjected to pipe corner cutting is attached to a body die provided with a branch pipe cavity, and the straight pipe outer wall on the side where the pipe blank is subjected to pipe corner cutting is attached to a body die not provided with a branch pipe cavity; and during inner high-pressure forming, eachof a left push head and a right push head is provided with a detachable sealing head, and the detachable sealing heads and the inner wall of the pipe blank are sealed. The device comprises an upper body die, a lower body die, the detachable sealing heads, a forming cavity, a branch pipe hole and an ejector rod. Each of the front ends of the left push head and the right push head is connected withthe corresponding detachable sealing head, and the detachable sealing heads and the pipe blank are designed through the above method. Through design on the pipe blank shape and improvement on the device, the integral wall thickness uniformity of a formed tee-joint pipe straight pipe can be improved.

Inner high-pressure tee-joint pipe wall thickness uniform forming method and device

The invention discloses a bending formation method of a small-curvature bending radius L type thin-wall aluminum alloy bent pipe. Two ends of the bent inner side of a long pipe blank of an aluminum alloy thin-wall pipe blank are grooved by 35-45 degrees; a protective agent is coated at the external of the pipe blank; oily molybdenum disulfide is sprayed in the semi-cylindrical surface of an area from the from part of the bent inner side of the pipe blank to the front part pi D, so that a material on the bent inner side of the pipe is facilitated to flow and to improve wrinkling; a traditional polyurethane round bar is replaced; multiple polyurethane cylinder blocks are filled in the pushed end of the pipe blank; and compared with an integral polyurethane filler rod, the taking out is easier after formation, and the forming efficiency is improved. Meanwhile, the polyurethane cylinder blocks with proper hardness, thickness and diameter facilitate internal support of the bent pipe, and are not liable to generate wrinkles on the bent inner side; and the jacking force of a core head is reinforced during forming to supply enough internal pressure into the pipe through a filler to force a lot of materials to flow to the front groove so as to prevent wrinkling to form the qualified small-curvature bending radius L type thin-wall aluminum alloy pipe.

Bending formation method of small-curvature bending radius L type thin-wall aluminum alloy bent pipe

The invention discloses a method for hydraulic forming of a tee pipe using teflon film local lubrication. A rectangular teflon film is designed according to the diameter of a pipe billet and the diameter of a tee pipe branch pipe, the center portion, where the tee pipe branch pipe is to be formed, of the pipe billet is symmetrically wrapped with the teflon film to replace the mode that the outside of the entire pipe is coated with oily lubricant or completely wrapped with lubricating fluid in the prior art, and thus operation is made more convenient. Moreover, in the forming process, the branch pipe position can be better lubricated, materials can flow into a branch pipe mold cavity quickly, and fracturing caused by insufficient supplementing of the branch pipe forming materials is avoided. Meanwhile, due to the fact that the back portion of the branch pipe is not wrapped with a thin film, friction is large, the material flowing speed is low, and wrinkling cannot happen easily.

Method for hydraulic forming of tee pipe using teflon film local lubrication

The invention discloses a method for matching the relation between internal pressure of a three-way pipe and feeding during internal high-pressure forming. An overflow valve is added to an existing internal high-pressure forming device, so that overpressure fracture during formation is avoided. Structurally, a device mainly comprises an ultrahigh-pressure booster pumping system, a low-pressure pumping system, a pipe-end axial displacement feeding system, a three-way pipe upper mold, a three-way pipe lower mold, a left punch, a right punch, the overflow valve and an oil groove. A thin-wall aluminum alloy pipe is placed in the device for internal high-pressure formation, an experiment that the pipe end is sealed and fixed and pressure is increased to expand the pipe billet and an experiment that the pipe end is sealed and fed discontinuously and the internal pressure is stable and does not exceed the limit are performed firstly, the limit bulging pressure and the axial limit feeding amount of the pipe billet in a three-way pipe mold cavity are recorded respectively, a thin-wall aluminum alloy three-way pipe part difficult to form is obtained on the same device through fewer experiments by using detected data, the forming steps are simple, the method is practical and high in efficiency, and the material cost and the experiment cost are saved.

Method for matching relation between internal pressure of three-way pipe and feeding during internal high-pressure forming

The invention relates to the field of pipe machining, in particular to a push head structure for sealing a multi-layer pipe. The push head structure at least comprising a first guide section, a second guide section and a thrust table, the second guide section is arranged at one end of the first guide section, and the thrust table is arranged at the end, far away from the first guide section, of the second guide section; the sectional areas of the first guide section, the second guide section and the thrust table are gradually increased in sequence; the push head structure is internally provided with a first conveying pipe penetrating the first guide section, the second guide section and the thrust table in the axial direction of the push head structure, a second conveying pipe vertical to the first conveying pipe and communicated with the first conveying pipe is arranged in the second guide section, and the second conveying pipe penetrates the second guide section. The push head structure is simple in structure and convenient to machine, and the machining process is simplified.

Push head structure for sealing multi-layer pipe

The invention discloses an internal high-pressure forming and push-bending forming device, an internal high-pressure forming method and a push-bending forming method. The internal high-pressure forming and push-bending forming device comprises a die assembly press machine, a die, a workbench, a hydraulic system, a water pressure system and a control system; a backing plate is arranged on the workbench; a left push cylinder and a right push cylinder are arranged on the backing plate; a rear push cylinder is arranged at the side part of the backing plate; the left push cylinder, the right push cylinder, the rear push cylinder and an ejection cylinder are subjected to movement control through the hydraulic system; a supercharging cylinder system of the left push cylinder communicates with the water pressure system; the rear push cylinder and the ejection cylinder are connected with a first hydraulic system through pipelines; a first rotary valve and a second rotary valve are arranged at a junction between a pipeline of the ejection cylinder and a pipeline of the rear push cylinder; and through the adjustment of the first rotary valve and the second rotary valve, one of the ejection cylinder and the rear push cylinder is controlled to drive. The left push cylinder and the right push cylinder are arranged on the surface of the workbench, so that internal high-pressure forming is realized; the left push cylinder is matched with the rear push cylinder, so that push-bending forming can be realized; the internal high-pressure forming and the push-bending forming share the same push cylinder, so that a floor area of equipment is reduced and a floor use rate is raised; and one set of equipment is maintained in a maintenance process, so that the maintenance cost is saved.

Xu Xuefeng

Papers

Bending formation method of small-curvature bending radius L type thin-wall aluminum alloy bent pipe

Method for hydraulic forming of tee pipe using teflon film local lubrication

Method for matching relation between internal pressure of three-way pipe and feeding during internal high-pressure forming

Push head structure for sealing multi-layer pipe

Internal high-pressure forming and push-bending forming device, internal high-pressure forming method and push-bending forming method