Forging and forming device and process for oil and gas production joint

Abstract

The invention relates to the technical field of metal pipe forging and pressing, solves the problems that the forming efficiency and precision are low due to the fact that the forging and pressing forming process of the special-shaped end of an oil and gas production connector is complex and difficult to control, and particularly discloses an oil and gas production connector forging and pressing forming device and technology. The oil and gas production connector forging and pressing forming device comprises an upper die mechanism and a lower die mechanism, and the upper die mechanism is arranged above the lower die mechanism; the upper die mechanism comprises a press connecting seat and an upper die pressing block connected to the press connecting seat, a first upper forming face, a second upper forming face and a third upper forming face which are sequentially connected in the vertical direction are arranged on one side of the upper die pressing block, and included angles are formed between the second upper forming face and the first upper forming face and between the second upper forming face and the third upper forming face respectively. The lower die mechanism comprises a lower die pressing base, and a forming groove used for containing the end of the connector pipe fitting is formed in the lower die pressing base. The method comprises the steps of material reinspection, blanking, primary heating, primary stamping, secondary heating, secondary stamping forming and the like. The device is used for compression molding of metal pipe fittings, and the machining efficiency and precision are higher.

Description

Technical Field

[0001] The present invention relates to the technical field of metal pipe forging, in particular to a forging and forming device and process for oil and gas production connectors. Background Art

[0002] With the continuous development and utilization of oil and gas resources, the number of abandoned oil and gas wells is increasing continuously, and the potential threats they pose to the environment and humans are also becoming increasingly severe. Therefore, implementing effective plugging measures for abandoned oil and gas wells has become an indispensable environmental protection means. Among them, the plugging method using pipelines and valves is favored due to its high efficiency and reliability. During the process of installing valves on pipelines, extremely strict requirements are imposed on the pipeline material and its processing quality. However, in the traditional method of processing after forging blanks, due to the special shape at one end of the pipeline, the processing process is complex and time-consuming. Not only does it require the use of a complex machining center system, but it also easily causes material waste, thereby increasing the production cost. Summary of the Invention

[0003] To solve the problems in the prior art that the forging and forming process of the special-shaped end of the oil and gas production connector is complex and difficult to control, resulting in low forming efficiency and accuracy, the present invention provides a forging and forming device and process for oil and gas production connectors.

[0004] The technical solution adopted by the present invention is as follows: A forging and forming device for oil and gas production connectors, comprising an upper die mechanism and a lower die mechanism, wherein the upper die mechanism is arranged above the lower die mechanism; Among them, the upper die mechanism includes a press connecting seat and an upper die block connected to the press connecting seat. One side of the upper die block is provided with a first upper forming surface, a second upper forming surface, and a third upper forming surface connected in sequence along the vertical direction. An included angle is provided between the second upper forming surface and the first upper forming surface and the third upper forming surface respectively; The lower die mechanism includes a lower die pressing seat, and a forming groove for accommodating the end of the joint pipe is formed on the lower die pressing seat. The shape of the forming groove matches that of the upper die block, and a space for forming the joint pipe is provided between the forming groove and the upper die block; The first upper forming surface and the second upper forming surface are used in the first stamping forming and the second stamping forming to respectively contact different depths of the joint pipe through pressure, so that the end of the joint pipe is formed into a first stamping shape and a second stamping shape respectively. The third upper forming surface is used in the second stamping forming to contact the joint pipe through pressure so that the end of the joint pipe is formed into a second stamping shape.

[0005] Further, it further includes a bottom support seat, which is arranged below the lower die mechanism. The cross-section of the bottom support seat is convex-shaped, and the bottom support seat is used to support the bottom end of the joint pipe during stamping forming.

[0006] Further, on one side of the inner wall of the forming groove opposite to the first upper forming surface, the second upper forming surface, and the third upper forming surface of the upper die pressing block, a first lower forming surface, a second lower forming surface, and a third lower forming surface corresponding to the upper die pressing block in shape are provided; Among them, the first lower forming surface is used to contact the same part of the joint pipe fitting during the first stamping forming and the second stamping forming, and keep the shape of the contacted part of the joint pipe fitting unchanged; the second lower forming surface and the third lower forming surface are used to contact and fit with the joint pipe fitting through pressure during the second stamping forming, and cooperate with the second upper forming surface and the third upper forming surface to form the second stamping shape of the joint pipe fitting.

[0007] Further, an infrared temperature sensor facing the lower die pressing seat is provided at the connection between the upper die pressing block and the press connecting seat, and the infrared temperature sensor is arranged on one side close to the third upper forming surface of the upper die pressing block; The infrared temperature sensor is used to collect the temperature of the deformed part of the joint pipe fitting during the first stamping forming, and feedback the temperature information, so that the upper die mechanism adjusts the descending speed of the press connecting seat according to the change rate of the cooling temperature, and controls the deformation amount of the first stamping forming.

[0008] Further, the infrared sensor is connected to a stamping control system through signal transmission. The stamping control system includes a central processing unit, a data transceiver unit, a monitoring and display unit, and a control execution unit. The central processing unit is respectively connected to the data transceiver unit, the monitoring and display unit, and the control execution unit. The data transceiver unit is connected to the control execution unit, and the control execution unit is connected to the upper die mechanism; Among them, the central processing unit is used to process the temperature information received by the data transceiver unit, and issue control instruction information according to the processing result; the data transceiver unit is used to receive the temperature information collected by the infrared temperature sensor and transmit it to the control execution unit, and transmit the control instruction information of the control execution unit to the control execution unit; the control execution unit is used to execute the control instruction information and adjust the stamping forming process parameters of the upper die mechanism.

[0009] A forging and forming process for oil and gas production joints includes the following steps: S1. Blanking pretreatment: Cut seamless steel pipes with the required diameter and wall thickness for oil and gas production joints according to the same length; remove the burrs at both ends of the steel pipe, and check whether there are obvious defects on the surface of the steel pipe; if there are no defects on the surface, transfer to the forging process; S2. First heating: Place one end of the pipe fitting blank in a high-frequency heating furnace for heating treatment. The end of the pipe fitting blank is heated to 1050°C - 1150°C, and the continuous heating time is 3 - 8 minutes; S3. First stamping: After heating the end of the pipe fitting to a fully penetrated state, cool the pipe fitting. After the end of the pipe fitting is preliminarily cooled, place it in the lower die mechanism, start the hydraulic press to descend, lower the upper die mechanism and perform the first stamping on the pipe fitting to form the first stamping shape on the pipe fitting. S4. Second heating: Put the pipe fitting after the first deformation into a high-frequency furnace for secondary heating, and the heating temperature is 1050°C - 1150°C. S5. Second stamping and forming: Perform the second stamping and forming on the heated pipe fitting to form the second stamping shape and realize the product forming.

[0010] Further, the first stamping in S3 specifically includes the following steps: S301. After the preliminarily cooled pipe fitting is placed between the lower die mechanism and the bottom support seat, control the hydraulic press to descend so that the end of the upper die block extends into the inner wall of the pipe fitting and continues to move downward along the inner wall of the pipe fitting until the upper end surface of the pipe fitting and the intersection of the first upper forming surface and the second upper forming surface are in the same plane, then control the hydraulic press to stop. S302. Obtain the current temperature of the end of the pipe fitting when the hydraulic press stops through the infrared temperature sensor, and judge whether the end of the pipe fitting is cooled to the first stamping feed temperature threshold or below: If the current temperature of the end of the pipe fitting is greater than the first stamping feed temperature threshold, cool the end of the pipe fitting through the auxiliary cooling equipment until it reaches the first stamping feed temperature threshold; If the current temperature of the end of the pipe fitting is less than or equal to the first stamping feed temperature threshold, control the hydraulic press to start descending again, so that the second upper forming surface starts to contact and press on the inner wall of the pipe fitting. During the descending process of the hydraulic press, according to the temperature data of the end of the pipe fitting obtained in real time by the infrared temperature sensor, collect, process and output commands for the data through the stamping control system, and control and adjust the descending speed of the hydraulic press in real time according to the commands output by the stamping control system until the hydraulic press can no longer continue to descend or move to the position where the upper end surface of the pipe fitting and the intersection of the second upper forming surface and the third upper forming surface are in the same plane, then stop the hydraulic press, and the pipe fitting forms the first stamping shape. S303. The hydraulic press rises, and the upper die block rises and withdraws from the inner wall of the pipe fitting to prepare for the second heating.

[0011] Further, the second stamping and forming in S5 includes the following steps: S501. After the heated pipe fitting is placed between the lower die mechanism and the bottom support seat, control the hydraulic press to descend so that the upper die block extends into the inner wall of the pipe fitting and continues to move downward along the inner wall of the pipe fitting until it moves to the height where the hydraulic press forms the first stamping shape on the pipe fitting in S302, then control the hydraulic press to stop. S502. Obtain the current temperature of the end of the pipe fitting when the hydraulic press in S501 stops through an infrared temperature sensor, and determine whether the temperature of the end of the pipe fitting has cooled to the second stamping feed temperature threshold or above. If the current temperature of the end of the pipe fitting is less than the second stamping feed temperature threshold, heat the end of the pipe fitting through an auxiliary heating device until it reaches the second stamping feed temperature threshold. If the current temperature of the end of the pipe fitting is greater than or equal to the second stamping feed temperature threshold, control the hydraulic press to start descending again, so that the third upper forming surface starts to contact and press against the inner wall of the pipe fitting. During the descent of the hydraulic press, according to the temperature data of the end of the pipe fitting obtained in real time by the infrared temperature sensor, the stamping control system collects, processes the data and outputs commands, and adjusts the descent speed of the hydraulic press in real time according to the commands output by the stamping control system until the upper die block reaches the die closing position point of the forming groove of the lower die seat, and the pipe fitting forms the second stamping shape. If the temperature of the end of the pipe fitting is less than the second stamping feed temperature threshold during the descent of the hydraulic press in the second stamping, control the hydraulic press to stop heating and insulating the end of the pipe fitting until the condition of the second stamping feed temperature threshold is met. S503. After maintaining the die closing state of the upper die mechanism and the lower die mechanism for a period of time, control the hydraulic press to rise, so that the upper die block rises and withdraws from the inner wall of the pipe fitting, completing the second stamping forming process.

[0012] Furthermore, the seamless steel pipe uses 30CrMo material, with a set length of 400 mm - 550 mm. When heating for the first time, heat the end of the pipe fitting to a temperature value of 1100 °C, with a continuous heating time of 5 minutes, and cool it preliminarily to 850 °C - 1000 °C before performing the first stamping forming. The first stamping feed temperature threshold is set to 700 °C - 800 °C. When heating for the second time, heat the end of the pipe fitting to a temperature value of 1100 °C, and the second stamping feed temperature threshold is set to 1020 °C - 1080 °C.

[0013] Furthermore, the first stamping feed temperature threshold is set to 750 °C, and the second stamping feed temperature threshold is set to 1050 °C.

[0014] The beneficial effects of the present invention are as follows: By optimizing the process parameters of the forging and forming process of the oil and gas production joint, the present invention realizes more precise control of the forging process. At the same time, by improving the structure of the forming device, the special-shaped end of the joint pipe fitting is formed by two-stage stamping with the contact of three forming surfaces, improving the forming accuracy and efficiency of the blank. This device and process not only significantly reduce the production cost, but also significantly improve the strength and wear resistance of the product, enhance the overall quality of the joint, and strengthen the market competitiveness of the product. Description of the Drawings

[0015] Figure 1 It is a schematic structural diagram of the forging and forming device of the present invention; Figure 2 Schematic diagram of the processing structure for the first stamping forming of the present invention; Figure 3 Schematic diagram of the processing structure for the second stamping forming of the present invention; Figure 4 Process flow chart of the forging forming of the present invention.

[0016] Reference numerals: 1, upper die mechanism; 2, lower die mechanism; 3, bottom support seat; 11, press connecting seat; 12, upper die pressing block; 121, first upper forming surface; 122, second upper forming surface; 123, third upper forming surface; 13, infrared temperature measuring sensor; 21, lower die pressing seat; 22, forming groove; 221, first lower forming surface; 222, second lower forming surface; 223, third lower forming surface. Detailed implementation manners

[0017] The present invention will be described in detail below with reference to the drawings and embodiments.

[0018] Embodiment 1. This embodiment is a forging forming device for oil and gas production joints, mainly applied to the forging forming processing of metal joint pipe fittings for oil and gas resource exploitation. Please refer to Figures 1-3 , the device includes an upper die mechanism 1 and a lower die mechanism 2, and the upper die mechanism 1 is arranged above the lower die mechanism 2; wherein, the upper die mechanism 1 includes a press connecting seat 11 and an upper die pressing block 12 connected to the press connecting seat 11. One side of the upper die pressing block 12 is provided with a first upper forming surface 121, a second upper forming surface 122 and a third upper forming surface 123 connected in sequence along the vertical direction. An included angle is provided between the second upper forming surface 122 and the first upper forming surface 121 and the third upper forming surface 123 respectively; The lower die mechanism 2 includes a lower die pressing seat 21, and a forming groove 22 for accommodating the end of the joint pipe fitting is formed on the lower die pressing seat 21. The shape of the forming groove 22 is matched with the upper pressing block and a space for forming the joint pipe fitting is provided between the forming groove 22 and the upper pressing block; The first upper forming surface 121 and the second upper forming surface 122 are used in the first stamping forming and the second stamping forming. They are respectively in pressure contact with different depths of the joint pipe fitting through pressure, so that the end of the joint pipe fitting is formed into a first stamping shape and a second stamping shape respectively. The third upper forming surface 123 is used in the second stamping forming to be in pressure contact with the joint pipe fitting through pressure so that the end of the joint pipe fitting is formed into a second stamping shape.

[0019] The oil and gas production joint forging and forming device of this embodiment realizes the efficient and precise forming of the special-shaped end through structural innovation and process optimization. Its core improvement lies in integrating the traditional multi-process decentralized forming process into two-stage stamping in phases, which is specifically achieved through the following technical path: The upper die mechanism 1 adopts a three-stage integrated forming surface design. The first upper forming surface 121, the second upper forming surface 122, and the third upper forming surface 123 form a stepped structure through angle differences. The second surface forms an angle with the first and third surfaces respectively. This geometric structure layout enables the three surfaces to intervene in the deformation in sequence and in layers during the stamping process. The forming groove 22 of the lower die mechanism 2 matches the upper die, and the reserved space for staged deformation allows the material to deform step by step, avoiding stress concentration caused by single stamping. During the first stamping, the first upper forming surface 121 first contacts the end of the pipe fitting, and then the second upper forming surface 122 guides the forming direction of the material at an angle, completing the deformation to the first stamping shape. At this time, the material distribution is more uniform; during the second stamping, the second upper forming surface 122 further compacts the transition area, and the third upper forming surface 123 further forms and finishes the end details, finally forming a high-precision special-shaped structure.

[0020] In this embodiment, the forging and forming device simplifies the 3 - 4 times of die-changing stamping in the traditional process into two consecutive stampings with the same die, reducing the cumulative positioning error by more than 50%. In terms of efficiency improvement, through process integration (without changing the die) and the corresponding matching of spatial shape grading, the single-piece production cycle of this device is shortened by 30% - 50%, and the material utilization rate is increased by about 15%, which is especially suitable for batch manufacturing. Compared with the traditional multi-process forming process, this device has significant advantages in terms of precision, efficiency, and cost control. For example, when forming a joint with a 30° - 45° transition conical surface, the end angle error can be controlled within ±0.5°, the surface roughness reaches Ra3.2μm, and the production efficiency is significantly improved, fully reflecting the outstanding contribution of the device structure innovation and process coordination to the manufacturing of high-end oil and gas equipment.

[0021] As a preferred implementation manner, the forging and forming device further includes a bottom support seat 3. The bottom support seat 3 is arranged below the lower die mechanism 2. The cross-section of the bottom support seat 3 is convex-shaped, and the bottom support seat 3 is used to support the bottom end of the joint pipe fitting during stamping and forming.

[0022] Embodiment 2. On the basis of Embodiment 1, on one side of the inner wall of the molding groove 22 opposite to the first upper molding surface 121, the second upper molding surface 122, and the third upper molding surface 123 of the upper die pressing block 12, there are provided a first lower molding surface 221, a second lower molding surface 222, and a third lower molding surface 223 whose shapes respectively correspond to those of the upper die pressing block 12. Among them, the first lower molding surface 221 is used to contact the same part of the joint pipe fitting during the first stamping and the second stamping, and keep the shape of the contacted part of the joint pipe fitting unchanged. The second lower molding surface 222 and the third lower molding surface 223 are used to contact and fit with the joint pipe fitting by pressure during the second stamping, and cooperate with the second upper molding surface 122 and the third upper molding surface 123 to make the joint pipe fitting form a second stamping shape.

[0023] As a preferred implementation manner, an infrared temperature sensor 13 facing the lower die pressing seat 21 is provided at the connection between the upper die pressing block 12 and the press connecting seat 11. The infrared temperature sensor 13 is arranged on one side close to the third upper molding surface 123 of the upper die pressing block 12. Among them, the infrared temperature sensor 13 is used to collect the temperature of the deformed part of the joint pipe fitting during the first stamping, and feedback the temperature information, so that the upper die mechanism 1 adjusts the descending speed of the press connecting seat 11 according to the change rate of the cooling temperature, and controls the deformation amount of the first stamping.

[0024] As a preferred implementation manner, the infrared sensor is connected to a stamping control system through signal transmission. The stamping control system includes a central processing unit, a data transceiver unit, a monitoring and display unit, and a control execution unit. The central processing unit is respectively connected to the data transceiver unit, the monitoring and display unit, and the control execution unit. The data transceiver unit is connected to the control execution unit. The control execution unit is connected to the upper die mechanism 1. Among them, the central processing unit is used to process the temperature information received by the data transceiver unit, and issue control instruction information according to the processing result. The data transceiver unit is used to receive the temperature information collected by the infrared temperature sensor and transmit it to the control execution unit, and transmit the control instruction information of the control execution unit to the control execution unit. The control execution unit is used to execute the control instruction information and adjust the stamping process parameters of the upper die mechanism 1.

[0025] Based on the forging and forming device of Embodiment 2, on the basis of staged stamping and forming, the present invention further optimizes the accuracy of the deformation process through the linkage of temperature monitoring and the stamping control system. Its working process and principle are as follows: In the first stamping stage, the upper die pressing block 12 cooperates with the lower die mechanism 2 to preform the end of the pipe fitting. At this time, the first lower forming surface 221 ensures the stability of the basic contour of the material by restricting the deformation amount of the contact area with a fixed shape. The infrared temperature sensor 13 installed on the side close to the third upper forming surface 123 collects the temperature data of the deformed part of the pipe fitting in real time, and analyzes the temperature change rate through the stamping control system. According to this temperature change information, the stamping process is controlled in real time, such as parameters such as stamping speed and stamping pressure, to avoid problems that affect product quality caused by excessive deformation speed and deformation amount of the joint pipe fitting.

[0026] The stamping control system of the present invention can also adjust the forging and forming process of the pipe fitting according to the temperature change caused by a large amount of heat released by the deformation of the metal part. For example, if the material has a sharp temperature rise due to plastic deformation (which may cause overburning or softening), the system will dynamically adjust the lowering speed of the press connecting seat 11 according to the preset temperature control threshold: when the temperature rise rate exceeds the set value, the system reduces the stamping speed to slow down the material flow and avoid excessive deformation caused by heat accumulation; otherwise, it maintains or increases the speed to improve efficiency. In this process, the temperature change rate and the stamping speed form a negative feedback closed-loop control, and form a dynamic balance with the deformation amount.

[0027] In the second stamping stage, the second upper forming surface 122 and the third upper forming surface 123 cooperate with the second lower forming surface 222 and the third lower forming surface 223 of the lower die mechanism 2 to complete the final forming. At this time, the first stamping has ensured that the material is in an ideal plastic state through temperature-related forming control. The upper die pressing block 12 applies pressure at the optimized speed adjusted by the system, so that the second and third upper forming surfaces 123 accurately guide the material to form the complex contour of the special-shaped end of the joint pipe fitting. During the second stamping process, the temperature monitoring and data acquisition of the infrared temperature sensor can be used to ensure that the joint pipe fitting is always within the optimal forming temperature range, improving the forming effect of the product.

[0028] The synchronization of the temperature monitoring data in this embodiment can also be used to verify the process stability. For example, by monitoring the cooling rate after stamping, it is judged whether the material phase change meets the standard. If it is abnormal, the system will trigger an alarm or automatically correct the subsequent stamping parameters.

[0029] Through temperature-speed linkage control, the present invention transforms the traditional stamping process that relies on empirical judgment into a data-driven dynamic adjustment. For example, when processing high-strength alloy steel joints, the system can respond in real time to the hardness reduction of the material due to deformation heat, and avoid out-of-tolerance forming dimensions by reducing the speed by 20%-30%. The forming accuracy of the end (such as wall thickness tolerance) is improved from ±0.5mm to ±0.2mm, while reducing the grain coarsening defect caused by overheating, and the scrap rate is reduced by more than 40%. The mechanism setting of this control process not only improves the forming consistency of complex special-shaped structures, but also significantly enhances the ability of the process to adapt to different material characteristics.

[0030] Example 3. This example is about the forging and forming process of oil and gas production connectors. Please refer to Figures 1-4 , and the forging and forming process can be specifically implemented according to the following steps: A forging and forming process of oil and gas production connectors includes the following steps: S1. Blanking pretreatment: Cut seamless steel pipes with the required diameter and wall thickness for the oil and gas production connectors to the same length. The seamless steel pipes can be made of 30CrMo material, with a set length of 400 mm, 510 mm or 550 mm. The diameter of the seamless steel pipes can be selected as 133 mm, and the wall thickness as 18.5 mm. Remove the burrs at both ends of the steel pipes and check whether there are obvious defects on the surface of the steel pipes. If there are no surface defects, transfer to the forging process. S2. First heating: Place one end of the pipe fitting blank in a high-frequency heating furnace for heat treatment. Heat the end of the pipe fitting blank to 1050°C - 1150°C, and the continuous heating time is 3 - 8 minutes. As a preferred implementation method, when heating for the first time, heat the end of the pipe fitting to the temperature values of 1050°C, 1100°C, or 1150°C, with a continuous heating time of 5 minutes, and then cool it preliminarily to 850°C, 900°C, 950°C or 1000°C before performing the first stamping and forming. S3. First stamping: After heating the end of the pipe fitting to a completely penetrated state, cool the pipe fitting. After the end of the pipe fitting is preliminarily cooled, place it in the lower die mechanism, start the hydraulic press to descend, so that the upper die mechanism descends and performs the first stamping on the pipe fitting, forming the first stamping shape on the pipe fitting. Specifically, the first stamping further includes the following steps: S301. After placing the preliminarily cooled pipe fitting between the lower die mechanism and the bottom support seat, control the hydraulic press to descend so that the end of the upper die block extends into the inner wall of the pipe fitting and continues to move downward along the inner wall of the pipe fitting until the upper end surface of the pipe fitting and the intersection of the first upper forming surface and the second upper forming surface are in the same plane, and then control the hydraulic press to stop. S302. Obtain the current temperature of the end of the pipe fitting when the hydraulic press stops through an infrared temperature sensor, and determine whether the end of the pipe fitting has cooled to the first stamping feed temperature threshold or below: If the current temperature of the end of the pipe fitting is greater than the first stamping feed temperature threshold, cool the end of the pipe fitting through an auxiliary cooling device until it reaches the first stamping feed temperature threshold; If the current temperature of the end of the pipe fitting is less than or equal to the first stamping feed temperature threshold, control the hydraulic press to start descending again, so that the second upper forming surface starts to contact and apply pressure to the inner wall of the pipe fitting. During the descent of the hydraulic press, according to the temperature data of the end of the pipe fitting obtained in real time by the infrared temperature sensor, the stamping control system collects, processes and outputs instructions for the data, and adjusts the descent speed of the hydraulic press in real time according to the instructions output by the stamping control system until the hydraulic press can no longer continue to descend or stops when the upper end surface of the pipe fitting and the junction of the second upper forming surface and the third upper forming surface are in the same plane, and the pipe fitting forms the first stamping shape; Preferably, the first stamping feed temperature threshold is set to 700 °C, 750 °C or 800 °C; S303. The hydraulic press rises to make the upper die block rise and withdraw from the inner wall of the pipe fitting to prepare for the second heating.

[0031] S4. Second heating. Put the pipe fitting after the first deformation into a high-frequency furnace for secondary heating, and the heating temperature is 1050 °C, 1100 °C or 1150 °C; S5. Second stamping and forming. Perform second stamping and forming on the heated pipe fitting to form the second stamping shape and realize product forming. Specifically, the second stamping and forming further includes the following steps: S501. After the heated pipe fitting is placed between the lower die mechanism and the bottom support seat, control the hydraulic press to descend so that the upper die block extends into the inner wall of the pipe fitting and continues to move downward along the inner wall of the pipe fitting until it moves to the height where the hydraulic press forms the first stamping shape of the pipe fitting in S302, and then control the hydraulic press to stop; S502. Obtain the current temperature of the end of the pipe fitting when the hydraulic press in S501 stops through an infrared temperature sensor, and determine whether the temperature of the end of the pipe fitting has cooled to the second stamping feed temperature threshold or above. If the current temperature of the end of the pipe fitting is less than the second stamping feed temperature threshold, heat the end of the pipe fitting through an auxiliary heating device until it reaches the second stamping feed temperature threshold. If the current temperature of the end of the pipe fitting is greater than or equal to the second stamping feed temperature threshold, control the hydraulic press to start descending again, so that the third upper forming surface starts to contact and apply pressure to the inner wall of the pipe fitting. During the descent of the hydraulic press, according to the temperature data of the end of the pipe fitting obtained in real time by the infrared temperature sensor, the stamping control system collects, processes the data and outputs commands, and adjusts the descent speed of the hydraulic press in real time according to the commands output by the stamping control system until the upper die block reaches the mold closing position point of the forming groove of the lower die seat, and the pipe fitting forms the second stamping shape. If the temperature of the end of the pipe fitting is less than the second stamping feed temperature threshold during the descent of the hydraulic press in the second stamping, control the hydraulic press to stop heating and insulating the end of the pipe fitting until the condition of the second stamping feed temperature threshold is met. The second stamping feed temperature threshold can be set to 1020 °C, 1040 °C, 1060 °C or 1080 °C.

[0032] S503. After maintaining the mold closing state of the upper die mechanism and the lower die mechanism for a period of time, control the hydraulic press to rise, so that the upper die block rises and withdraws from the inner wall of the pipe fitting, and the second stamping forming process is completed.

[0033] Based on the implementation of the above technical solutions, the forming process of the present invention can inhibit material thermal cracking and out-of-control deformation. By setting the stamping feed temperature threshold and adopting infrared real-time monitoring combined with hydraulic press speed interlocking control, it is ensured that the material completes plastic deformation under more ideal temperature conditions, and the deformation speed is prevented from being too fast under non-ideal temperature conditions, resulting in the crack sensitivity of the joint. By judging the size of the current temperature and the threshold value, the stamping speed is dynamically adjusted, so that the strain rate can match the material dynamic recrystallization rate, eliminating the risk of local necking. This process contacts the first and second upper forming surfaces in stages, controls the deformation amount through the intersection plane positioning, and applies pressure in a stepped manner to reduce the axial stress gradient, effectively avoiding the circumferential stress concentration generated by traditional single stamping. The measured residual stress value can be reduced from 350 MPa in the traditional process to below 220 MPa.

[0034] As one of the optimal examples, the present invention can set the first stamping feed temperature threshold to 750 °C and the second stamping feed temperature threshold to 1050 °C to achieve the best control effect of the deformation amount size in the first stamping and ensure the best pressing and forming effect in the second stamping.

[0035] To further facilitate the operator in obtaining the dynamic relationship between temperature and speed, based on the forming device and process of the present invention, a temperature-strain rate coupling control model can also be established, and the correlation function between the stamping speed v and the temperature T is established: v = k·exp(-Q / (R·T)), where k is the material constant, Q is the deformation activation energy, and R is the universal gas constant, whose value is 8.314 J / (mol·K), exp( x ) is the power function of the base of the natural logarithm, that is e , used to describe the exponential growth or decay relationship. By dynamically calculating the optimal stamping speed through real-time temperature feedback, the strain rate of the material is stabilized within the ideal range, improving the product quality. This process realizes the high-efficiency and precision manufacturing of high-strength oil and gas connectors through precise thermo-mechanical control, enabling the product to meet the requirements of extreme working conditions such as deep-sea oil and gas fields. Compared with the traditional process, the scrap rate is reduced from 12% to less than 1.5%, with significant technical and economic benefits. e x , which is used to describe the exponential growth or decay relationship. By dynamically calculating the optimal stamping speed through real-time temperature feedback, the strain rate of the material is stabilized within the ideal range, improving the product quality. This process realizes the high-efficiency and precision manufacturing of high-strength oil and gas connectors through precise thermo-mechanical control, enabling the product to meet the requirements of extreme working conditions such as deep-sea oil and gas fields. Compared with the traditional process, the scrap rate is reduced from 12% to less than 1.5%, with significant technical and economic benefits.

[0036] The forming process of the present invention can also be set with the following steps: S6. Pipe fitting trimming, removing the excess dimensions at the ends of the pipe fittings after the second forging and forming; S7. Finished product inspection, performing non-destructive inspection on the product, and taking the oil and gas connection end of the qualified inspection.

[0037] The above embodiments only represent the specific implementation manners of the present invention, and the description is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. An oil and gas production joint forging and forming device, characterized in that It includes an upper die mechanism and a lower die mechanism, and the upper die mechanism is arranged above the lower die mechanism; Among them, the upper die mechanism includes a press connecting seat and an upper die pressing block connected to the press connecting seat. One side of the upper die pressing block is provided with a first upper forming surface, a second upper forming surface, and a third upper forming surface connected in sequence in the vertical direction. An included angle is provided between the second upper forming surface and the first upper forming surface and the third upper forming surface respectively; The lower die mechanism includes a lower die pressing seat, and a forming groove for accommodating the end of the joint pipe fitting is opened on the lower die pressing seat. The shape of the forming groove matches that of the upper pressing block, and a space for forming the joint pipe fitting is provided between the forming groove and the upper pressing block; The first upper forming surface and the second upper forming surface are used in the first stamping and the second stamping. They respectively contact different depth parts of the joint pipe fitting through pressure, so that the end of the joint pipe fitting is formed into a first stamping shape and a second stamping shape respectively. The third upper forming surface is used in the second stamping to contact the joint pipe fitting through pressure to make the end of the joint pipe fitting formed into a second stamping shape.

2. The forging and forming device for an oil and gas production joint according to claim 1, wherein It also includes a bottom support seat, which is arranged below the lower die mechanism. The cross-section of the bottom support seat is convex-shaped, and the bottom support seat is used to support the bottom end of the joint pipe fitting during stamping.

3. The forging and forming device for an oil and gas production joint according to claim 1, wherein On the side of the inner wall of the forming groove opposite to the first upper forming surface, the second upper forming surface, and the third upper forming surface of the upper die pressing block, there are respectively arranged a first lower forming surface, a second lower forming surface, and a third lower forming surface whose shapes correspond to those of the upper die pressing block; Among them, the first lower forming surface is used to contact the same part of the joint pipe fitting during the first stamping and the second stamping, and keep the shape of the contacted part of the joint pipe fitting unchanged; the second lower forming surface and the third lower forming surface are used to contact and fit with the joint pipe fitting through pressure during the second stamping, and cooperate with the second upper forming surface and the third upper forming surface to make the joint pipe fitting form a second stamping shape.

4. The forging and forming device for an oil and gas production joint according to claim 1, characterized in that An infrared temperature sensor facing the lower die pressing seat is arranged at the connection between the upper die pressing block and the press connecting seat, and the infrared temperature sensor is arranged on one side close to the third upper forming surface of the upper die pressing block; The infrared temperature sensor is used to collect the temperature of the deformed part of the joint pipe fitting during the first stamping and feedback the temperature information, so that the upper die mechanism adjusts the descending speed of the press connecting seat according to the change rate of the cooling temperature, and controls the deformation amount of the first stamping.

5. The forging and forming device for an oil and gas production joint according to claim 4, characterized in that The infrared sensor is connected to a stamping control system through signal transmission. The stamping control system includes a central processing unit, a data transceiver unit, a monitoring and display unit, and a control execution unit. The central processing unit is respectively connected to the data transceiver unit, the monitoring and display unit, and the control execution unit. The data transceiver unit is connected to the control execution unit, and the control execution unit is connected to the upper die mechanism; Wherein, the central processing unit is used to process the temperature information received by the data transceiver unit and issue control instruction information according to the processing result; the data transceiver unit is used to receive the temperature information collected by the infrared temperature sensor and transmit it to the control execution unit, and transmit the control instruction information of the control execution unit to the control execution unit; the control execution unit is used to execute the control instruction information and adjust the stamping process parameters of the upper die mechanism.

6. A forging and forming process for an oil and gas production joint, characterized in that, The method includes the following steps: S1. Blanking pretreatment: Cut seamless steel pipes with the required diameter and wall thickness of the oil and gas production joint into the same length; remove the burrs at both ends of the steel pipe and check whether there are obvious defects on the surface of the steel pipe; if there are no defects on the surface, transfer to the forging process. S2. First heating: Place one end of the pipe fitting blank in a high-frequency heating furnace for heating treatment. The end of the pipe fitting blank is heated to 1050°C to 1150°C, and the continuous heating time is 3 to 8 minutes. S3. First stamping: After the end of the pipe fitting is heated to a fully penetrated state, cool the pipe fitting. After the end of the pipe fitting is preliminarily cooled, place it in the lower die mechanism, start the hydraulic press to descend, so that the upper die mechanism descends and performs the first stamping on the pipe fitting, so that the pipe fitting is stamped into the first stamping shape. S4. Second heating: Put the pipe fitting after the first deformation into the high-frequency furnace for secondary heating, and the heating temperature is 1050°C to 1150°C. S5. Second stamping and forming: Perform the second stamping and forming on the heated pipe fitting to form the second stamping shape and realize the product forming.

7. A forging and forming process for an oil and gas production joint according to claim 6, characterized in that, The first stamping in S3 specifically includes the following steps: S301. After the preliminarily cooled pipe fitting is placed between the lower die mechanism and the bottom support seat, control the hydraulic press to descend so that the end of the upper die pressing block extends into the inner wall of the pipe fitting and continues to move downward along the inner wall of the pipe fitting until the upper end surface of the pipe fitting and the intersection of the first upper forming surface and the second upper forming surface are in the same plane, then control the hydraulic press to stop. S302. Obtain the current temperature of the end of the pipe fitting when the hydraulic press stops through the infrared temperature sensor, and judge whether the end of the pipe fitting is cooled to the first stamping feed temperature threshold or below: If the current temperature of the end of the pipe fitting is greater than the first stamping feed temperature threshold, cool the end of the pipe fitting through the auxiliary cooling device until it reaches the first stamping feed temperature threshold; if the current temperature of the end of the pipe fitting is less than or equal to the first stamping feed temperature threshold, control the hydraulic press to start descending again, so that the second upper forming surface starts to contact and press the inner wall of the pipe fitting. During the descending process of the hydraulic press, collect, process and output instructions for the data according to the temperature data of the end of the pipe fitting obtained in real time by the infrared temperature sensor. According to the instructions output by the stamping control system, control and adjust the descending speed of the hydraulic press in real time until the hydraulic press can no longer continue to descend or move to the position where the upper end surface of the pipe fitting and the intersection of the second upper forming surface and the third upper forming surface are in the same plane, then stop the hydraulic press, and the pipe fitting forms the first stamping shape. S303. The hydraulic press rises, so that the upper die pressing block rises and withdraws from the inner wall of the pipe fitting to prepare for the second heating.

8. A forging and forming process for an oil and gas production joint according to claim 7, characterized in that, The second stamping forming includes the following steps: S501. After the heated pipe fitting is placed between the lower die mechanism and the bottom support seat, control the hydraulic press to descend so that the upper die pressing block extends into the inner wall of the pipe fitting and continues to move downward along the inner wall of the pipe fitting until it moves to the height at which the hydraulic press forms the first stamping shape in S302, and then control the hydraulic press to stop; S502. Obtain the current temperature of the end of the pipe fitting when the hydraulic press stops in S501 through the infrared temperature sensor, and judge whether the end of the pipe fitting has cooled to the second stamping feed temperature threshold or above: If the current temperature of the end of the pipe fitting is less than the second stamping feed temperature threshold, then use the auxiliary heating device to heat the end of the pipe fitting until it reaches the second stamping feed temperature threshold; If the current temperature of the end of the pipe fitting is greater than or equal to the second stamping feed temperature threshold, then control the hydraulic press to start descending again, so that the third upper forming surface begins to contact and press the inner wall of the pipe fitting. During the descending process of the hydraulic press, according to the temperature data of the end of the pipe fitting obtained in real time by the infrared temperature sensor, the stamping control system collects, processes and outputs commands for the data, and adjusts the descending speed of the hydraulic press in real time according to the commands output by the stamping control system until the upper die pressing block reaches the mold closing position point of the forming groove of the lower die seat, and the pipe fitting forms the second stamping shape; If the temperature of the end of the pipe fitting is less than the second stamping feed temperature threshold during the descending process of the hydraulic press in the second stamping, then control the hydraulic press to stop heating and insulating the end of the pipe fitting until the second stamping feed temperature threshold condition is met; S503. After maintaining the mold closing state of the upper die mechanism and the lower die mechanism for a period of time, control the hydraulic press to ascend so that the upper die pressing block ascends and exits from the inner wall of the pipe fitting, and complete the second stamping forming process.

9. A forging and forming process for an oil and gas production joint according to claim 8, characterized in that, The seamless steel pipe is made of 30CrMo material, and the set length is 400mm - 550mm; When heating for the first time, heat the end of the pipe fitting to a temperature value of 1100°C, and the continuous heating time is 5 minutes. After preliminary cooling to 850°C - 1000°C, then carry out the first stamping forming. The first stamping feed temperature threshold is set to 700°C - 800°C; When heating for the second time, heat the end of the pipe fitting to a temperature value of 1100°C, and the second stamping feed temperature threshold is set to 1020°C - 1080°C.

10. A forging and forming process for an oil and gas production joint according to claim 9, characterized in that, The first stamping feed temperature threshold is set to 750°C, and the second stamping feed temperature threshold is set to 1050°C.

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