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CN-122007312-A - Extrusion molding die and extrusion molding method for tee pipe fitting

CN122007312ACN 122007312 ACN122007312 ACN 122007312ACN-122007312-A

Abstract

The invention belongs to the technical field of metal plastic forming, and provides a three-way pipe fitting extrusion forming die and a three-way pipe fitting extrusion forming method thereof. The device comprises an outer sleeve die, a first core die, a second core die, a main punch, an active heat management module, an antifriction flow promotion module and a collaborative demolding module, wherein the first core die and the second core die are arranged in the outer sleeve die, the main punch is used for extrusion, the active heat management module, the antifriction flow promotion module and the collaborative demolding module comprise ejection mechanisms used for respectively ejecting the first core die and the second core die, the ejection mechanisms are hydraulic cylinders, and a force sensor and a displacement sensor are integrated on ejector rods of the ejection mechanisms. The method comprises the following steps of preparing and heating a blank, preheating a die and placing the blank in the die, performing in the step of 3, extruding a core, maintaining pressure and shaping in the step of 5, performing coordinated demoulding in the step of 6, performing air-cooling shrinkage in the step of a, performing split shrinkage in the step of b, performing servo control ejection, and performing ejection in the step of d.

Inventors

  • GUO JIHUA
  • FU YI
  • ZHAO HANDONG
  • XIONG TAO
  • Yin Liuzhu
  • WANG WANBING

Assignees

  • 北京皓欣能源科技集团有限公司

Dates

Publication Date
20260512
Application Date
20260310

Claims (7)

  1. 1. The utility model provides a tee bend pipe fitting extrusion forming mould, includes the cover mould, set up in first mandrel and second mandrel in the cover mould to and be used for extruded main drift, its characterized in that still includes: The active thermal management module comprises a partition type cooling flow passage, a thermocouple sensor and an intelligent temperature control unit; the intelligent temperature control unit dynamically adjusts parameters of cooling media flowing through the cooling flow passage according to feedback of the thermocouple sensor; The friction-reducing flow-promoting module comprises an ultrasonic vibration generator connected with the main punch and a surface functional layer, wherein the ultrasonic vibration generator is used for applying axial high-frequency vibration to the main punch in the extrusion process; The collaborative demolding module comprises an ejection mechanism for respectively ejecting the first core mold and the second core mold, wherein the ejection mechanism is a hydraulic cylinder, and a force sensor and a displacement sensor are integrated on an ejector rod of the ejection mechanism.
  2. 2. The three-way pipe extrusion die of claim 1 wherein said segmented cooling flow passages comprise an inner flow passage provided in said main ram and an outer flow passage provided in said outer die.
  3. 3. The three-way pipe extrusion die of claim 1, wherein the surface functional layer further comprises a wear-resistant lubrication layer and a ceramic thermal barrier layer; the wear-resistant lubricating layer is a micro-pit array and is used for lubricating; the ceramic thermal barrier layer is arranged below the wear-resistant lubricating layer and is used for heat insulation.
  4. 4. The extrusion die for three-way pipe fittings according to claim 1, wherein the co-demolding module further comprises a split combined structure of the second core mold, wherein a driving mechanism for driving the split blocks to radially shrink is arranged in the second core mold; and air cooling channels connected with a high-pressure air source are arranged in the first core die and the second core die.
  5. 5. A three-way pipe extrusion molding method using the three-way pipe extrusion molding die according to any one of claims 1 to 4, characterized by comprising the steps of: Step 1, heating a blank to a plastic forming temperature and placing the blank into a die; step 2, starting the active heat management module, and preheating the module; step 3, performing preforming; Step 4, a core extrusion stage, namely driving the main punch to extrude, starting the ultrasonic vibration generator to apply ultrasonic vibration at the same time, and dynamically controlling the temperature of the die through the intelligent temperature control unit; step 5, pressure maintaining and preliminary cooling; and step6, a collaborative demolding stage, namely separating and ejecting the core mold from the forging piece through the collaborative demolding module.
  6. 6. The extrusion molding method of three-way pipe according to claim 5, wherein in the step S4, the intelligent temperature control unit controls the operating temperature of the contact area of the die and the billet to be in the range of 350 ℃ to 450 ℃.
  7. 7. The extrusion molding method of three-way pipe fitting according to claim 6, wherein the step S6 includes: S6a, introducing high-pressure cooling gas into air cooling channels in the first core mold and the second core mold to enable the surfaces of the core molds to be miniaturized; S6b, starting the electrohydraulic servo ejection system, and synchronously ejecting the first core mold and the second core mold under the closed-loop control of force and displacement; wherein when the second mandrel is of a split structure, the segments thereof are driven to shrink radially inwardly prior to step S6 b.

Description

Extrusion molding die and extrusion molding method for tee pipe fitting Technical Field The invention relates to the technical field of metal plastic forming, in particular to a three-way pipe fitting extrusion forming die and a three-way pipe fitting extrusion forming method. Background The three-way pipe fitting is a key connecting piece of a pipeline system and is widely formed by hot extrusion. As shown in CN106424509a, in the prior art, a combination die and multiple punches are used to extrude a high-temperature billet step by step. However, this method has the obvious disadvantages that firstly, when the die (particularly the punch) is repeatedly contacted with the blank at about 1200 ℃, the die is subjected to severe cold-hot cycle and high-pressure friction, and is easy to generate thermal fatigue, softening and abrasion, and the service life is short, so that the production cost is high. Secondly, the huge friction resistance hinders the metal flow, and defects such as insufficient filling of the branch pipe, internal corner folding, surface scratch and the like are often caused, so that the forming quality is unstable. Moreover, the forging piece is high in holding force on the core die after being cooled, and the forced demolding is easy to cause workpiece deformation, surface damage or die wedge surface damage. Currently, industry improvements focus on developing higher performance die steels or optimizing lubricants, which are progressive improvements in the material layer. Therefore, we propose a device for actively managing and controlling the interaction between the mold and the workpiece through multi-field coupling, so as to solve the above-mentioned problems. Disclosure of Invention Aiming at the defects in the prior art, the invention provides a three-way pipe fitting extrusion molding die and a three-way pipe fitting extrusion molding method thereof, thereby solving the problems proposed by the background technology. The three-way pipe fitting extrusion molding die comprises a jacket die, a first mandrel, a second mandrel, a main punch, an active heat management module, a partition cooling flow passage, a thermocouple sensor and an intelligent temperature control unit, wherein the first mandrel and the second mandrel are arranged in the jacket die, the main punch is used for extrusion, the active heat management module comprises the partition cooling flow passage, the thermocouple sensor and the intelligent temperature control unit, the partition cooling flow passage is arranged in a high-temperature working area of the die, the thermocouple sensor is used for monitoring the temperature of the die, the intelligent temperature control unit dynamically adjusts parameters of cooling media flowing through the cooling flow passage according to feedback of the thermocouple sensor, the antifriction flow promotion module comprises an ultrasonic vibration generator connected with the main punch and used for applying axial high-frequency vibration to the main punch in the extrusion process, the surface functional layer is arranged on the surface of a cavity, which is in contact with a blank, of the die, the surface functional layer comprises a wear-resistant lubricating layer, and the demolding module comprises an ejection mechanism used for respectively ejecting the first mandrel and the second mandrel, and the ejection mechanism is a hydraulic cylinder, and the force sensor and a displacement sensor are integrated on the ejection mechanism. Further, the partition type cooling runner comprises an inner runner arranged on the main punch and an outer runner. In practical application, the design aims to realize cooling of a key area, on one hand, the influence of temperature difference on die equipment and three-way pipe fittings can be reduced, and on the other hand, the inner runner of the main punch and the outer runner are respectively communicated with an external cooling source, so that the control is convenient. Further, the surface functional layer further comprises a wear-resistant lubricating layer and a ceramic thermal barrier layer, wherein the wear-resistant lubricating layer is a micro-pit array and used for lubrication, and the ceramic thermal barrier layer is arranged below the wear-resistant lubricating layer and used for heat insulation. In practical application, the micro-pit array adopted by the wear-resistant lubricating layer is used for retaining lubricating substances such as lubricating oil or lubricating grease in the micro-pit array, so that the lubricating effect is improved, and the subsequent demolding is facilitated. And the ceramic thermal barrier layer is used for thermal insulation. Furthermore, the collaborative demolding module further comprises a split combined structure of the second core mold, a driving mechanism for driving the split blocks to radially shrink is arranged in the second core mold, and air cooling channels connected with a high-pressure air sou