Geothermal well valve barrel-shaped valve body chip rotary extrusion induced semi-solid extrusion upsetting forming process and device

Abstract

The application discloses a device and a process for cutting-extrusion induced semi-solid extrusion-upsetting forming of a well valve cylindrical valve body, wherein the process is characterized in that: firstly, cutting-extrusion is performed on cutting-extrusion scrap to obtain a solid initial forming; then, the initial forming is heated to a suitable temperature and kept for a period of time, so that semi-solid fine-grain material is obtained by using the original strain energy and the pre-deformation of the cutting-extrusion; then, the semi-solid fine-grain material is subjected to extrusion-upsetting forming; finally, the upper die is kept static, the lower die is driven by a multi-stage hydraulic cylinder to move upward as a whole, and the semi-solid fine-grain material is subjected to extrusion-upsetting to obtain a final forming well valve cylindrical valve body.

Description

Technical Field

[0001] This invention belongs to the field of semi-solid forming manufacturing technology of well valve cylindrical body, and specifically relates to the semi-solid extrusion upsetting process and device for well valve cylindrical body chip spin extrusion induced semi-solid extrusion. Background Technology

[0002] The cylindrical valve body of a ground well valve mainly consists of an inner well casing and an outer well casing. The outer and inner well casings are independent and do not interfere with each other. The ground well valve is installed inside the housing. The cylindrical valve body of the ground well valve effectively prevents damage to the oil supply pipeline network caused by natural disasters such as ground subsidence and earthquakes.

[0003] Traditional methods for recycling metal scrap involve significant energy consumption during the remelting and casting processes. Furthermore, the base material obtained from recycled metal scrap still requires secondary machining to meet the shape, size, and precision requirements of the parts. Currently, the strain energy of metal scrap is not being effectively utilized.

[0004] Traditional methods for manufacturing well boxes have many drawbacks, requiring the separate manufacture of inner and outer well casings followed by assembly. Well boxes are cylindrical components that can be manufactured using methods such as cutting, casting, and forging. Cutting results in significant material waste, the severing of metal fibers, and a reduction in the mechanical properties of the parts. Casting cannot fully utilize the inherent mechanical properties of the material. Forging for complex shapes suffers from low material utilization and high forming loads; furthermore, the low material utilization leads to a waste of alloying element resources. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention aims to provide a process and apparatus for semi-solid extrusion upsetting of well valve cylindrical body induced by chip spin extrusion, through which a high-performance well valve cylindrical body with a semi-solid spherulitic structure can be prepared.

[0006] To achieve the above objectives, the present invention provides a chip-induced semi-solid extrusion upsetting device for a cylindrical valve body of a well valve, comprising a U-shaped frame base for forming the device; a crossbeam is fixedly connected to the upper end of the U-shaped frame base, and a second servo motor and a third servo motor are mounted on the crossbeam; the output ends of the second servo motor and the third servo motor are connected to a first integral motor rotor screw and a second integral motor rotor screw, and the lower ends of the first integral motor rotor screw and the second integral motor rotor screw are mounted on the U-shaped frame base for forming the device; two nut-type movable crossbeams are fitted on the first integral motor rotor screw and the second integral motor rotor screw, and a first servo motor is mounted on the upper end of the two nut-type movable crossbeams; a medium-frequency induction self-heating upper mold is fixedly connected to the lower end of the output shaft of the first servo motor; a multi-stage hydraulic cylinder is fixedly mounted on the lower end of the U-shaped frame base for forming the device, and a medium-frequency induction self-heating lower mold is fixedly mounted on the upper end of the multi-stage hydraulic cylinder.

[0007] On the other hand, the present invention also provides a forming device process based on the above-mentioned chip rotary extrusion induced semi-solid extrusion upsetting device for the cylindrical valve body of the well valve, including the following steps: Step 1. Complete the rotary extrusion solid pre-forming of the cylindrical valve body chips; First, put the chip fragments into the medium frequency induction self-heating lower mold; Then, by controlling the first integral motor rotor screw and the second integral motor rotor screw to generate rotational motion, the two nut-type moving crossbeams installed with the first integral motor rotor screw and the second integral motor rotor screw move downward, driving the medium frequency induction self-heating lower mold. The upper hot mold moves downward and gradually flattens the chips and scraps. Then, the first servo motor installed on the upper side of the two nut-type moving crossbeams is controlled to rotate, which drives the medium frequency induction self-heating upper mold fixed to the output shaft of the first servo motor to rotate. At the same time, the first integral motor rotor screw and the second integral motor rotor screw are controlled to rotate, which drives the two nut-type moving crossbeams to move downward, so that the medium frequency induction self-heating upper mold moves downward and realizes the rotational extrusion deformation of the chips and scraps. This increases the deformation of the chips and scraps while obtaining the rotary extrusion solid preform of the well valve cylindrical valve body chips.

[0008] Step 2. Prepare semi-solid spherulite material and perform extrusion upsetting on the rotary extrusion solid preform of the well valve body obtained in Step 1. First, use the first induction heating coil distributed inside the upper mold and the first induction heating coil distributed inside the lower mold to simultaneously heat the upper and lower molds of the rotary extrusion solid preform of the well valve body to the semi-solid temperature range of the chip material and hold it at that temperature to obtain semi-solid fine spherulite material 2-1 with a diameter of 30-50 μm and an average shape factor ≥0.6. Then, control the rotation of the first integral motor rotor screw and the second integral motor rotor screw to drive the two nut-type moving crossbeams to move downward, so that the upper mold of the medium frequency induction self-heating moves downward, realizing the initial processing of the semi-solid fine spherulite material. The process involves extrusion deformation to obtain a semi-solid extruded well valve body. Then, the upper die is kept stationary by controlling the medium-frequency induction self-heating type, while the first-stage piston of the multi-stage hydraulic cylinder is activated, pushing the lower die upwards to achieve upsetting deformation of the semi-solid extruded well valve body, ultimately obtaining a semi-solid upset well valve body. Subsequently, the first and second integral motor rotor screws are rotated to drive the two nut-type moving crossbeams upwards to a preset height. Finally, multiple pistons of the multi-stage hydraulic cylinder are activated simultaneously, causing the middle part of the lower die to move upwards, pushing the final formed semi-solid upset well valve body until it is above the lower die, at which point it stops and is removed.

[0009] Compared with existing technologies, the present invention uses a chip spin extrusion-induced semi-solid extrusion upsetting process to prepare the cylindrical valve body of a well valve, which has the following advantages:

[0010] 1. The inner and outer wellbore bodies of the well valve are manufactured as a single unit, eliminating the need to drill threaded holes for assembling the inner and outer wellbore bodies and avoiding the troublesome process of assembling them.

[0011] 2. Fully utilize the existing strain energy and rotational extrusion strain energy of the shredded metal chips to induce a semi-solid state. Heating the chips to a semi-solid temperature and utilizing their deformation to create new high-energy grain boundaries within the material achieves dendrite breakage, preparing a semi-solid billet and avoiding mechanical and electromagnetic stirring. During mechanical stirring, the stirrer is in direct contact with the molten metal, resulting in a short stirrer lifespan and easy metal contamination. Electromagnetic stirring consumes a large amount of electrical energy, has a complex equipment structure, and is costly.

[0012] 3. The semi-solid forming of the well valve's cylindrical body results in low deformation resistance, high material utilization, and high yield. The semi-solid slurry has already released some of the latent heat of crystallization, reducing thermal shock to the mold and extending mold life.

[0013] 4. Combining multiple forming methods to fully utilize the advantages of rotary extrusion and upsetting. Rotary extrusion improves material properties by increasing deformation shear stress and shear strain to refine grains. Semi-solid upsetting results in high strength and good internal microstructure.

[0014] 5. Compared with traditional cylindrical part processing technology, this process can save production costs, improve production efficiency, and process parts with complex shapes. The formed parts have fine and uniform grains, dense structure, high dimensional accuracy, few defects, high strength, and good internal structure properties. Attached Figure Description

[0015] Figure 1 This is a process flow diagram of the present invention.

[0016] Figure 2 This is a schematic diagram of the removal process of the semi-solid extrusion-formed part of the well valve body, which is the final product of this invention.

[0017] Figure 3 This is a diagram of the apparatus used in the process of this invention. Detailed Implementation

[0018] The present invention will now be described in detail with reference to the accompanying drawings.

[0019] Reference Figure 1 , Figure 2 The semi-solid extrusion upsetting process for the cylindrical valve body of a well valve, induced by spun extrusion, includes the following steps:

[0020] 1) Solid preforming of cylindrical valve body chips by rotary extrusion 1. First, the chip fragments 1-1 are placed into the medium frequency induction self-heating lower mold 1-2; then, by controlling the rotation of the first integral motor rotor screw 1-3 and the second integral motor rotor screw 1-4, the two nut-type moving crossbeams 1-5 installed in conjunction with the first integral motor rotor screw 1-3 and the second integral motor rotor screw 1-4 move downward. As the two nut-type moving crossbeams 1-5 move downwards, they drive the medium-frequency induction self-heating upper mold 1-6 downwards, gradually flattening the chips 1-1. Then, the first servo motor 1-7, mounted on the upper side of the two nut-type moving crossbeams 1-5, is controlled to rotate, thereby driving the medium-frequency induction self-heating upper mold 1-6, which is fixedly connected to the output shaft of the first servo motor 1-7, to rotate. Simultaneously, the first integral motor rotor screw 1-3 and the second integral motor rotor screw 1-4 are controlled to rotate, driving the two nut-type moving crossbeams 1-5 downwards, causing the medium-frequency induction self-heating upper mold 1-6 to move downwards. Through the above-mentioned "downward rotational feeding" motion, the medium-frequency induction self-heating upper mold 1-6 achieves rotational extrusion deformation of the chips 1-1, increasing the deformation of the chips 1-1 while obtaining the rotary extrusion solid preform 1-8 of the well valve cylindrical valve body chips.

[0021] 2) Semi-solid extrusion upsetting of the well valve cylindrical body. The semi-solid spherulite material preparation and extrusion upsetting of the well valve cylindrical body chip rotary extrusion solid preform 1-8 obtained in step 1) are performed. The first induction heating coil 1-6-1 distributed inside the medium-frequency induction self-heating upper mold 1-6 and the first induction heating coil 1-2-1 distributed inside the medium-frequency induction self-heating lower mold 1-2 are used to simultaneously heat the medium-frequency induction self-heating upper mold 1-6 and the medium-frequency induction self-heating lower mold 1-2, thereby heating the well valve cylindrical body chip rotary extrusion solid preform 1-8 to the semi-solid temperature range of the chip fragment 1-1 material and holding it at that temperature to obtain a semi-solid fine spherulite material 2-1 with a diameter of 30-50 μm and an average shape factor ≥0.6. Next, the first integral motor rotor screw 1-3 and the second integral motor rotor screw 1-4 are controlled to rotate, driving the two nut-type moving crossbeams 1-5 to move downwards. This causes the medium-frequency induction self-heating upper die 1-6 to move downwards, achieving initial extrusion deformation of the semi-solid fine spherulite material 2-1, thereby obtaining the semi-solid extruded part 2-2 of the well valve body. Then, the medium-frequency induction self-heating upper die 1-6 remains stationary, and the first-stage piston 2-3-1 of the multi-stage hydraulic cylinder 2-3 is controlled to work, pushing the medium-frequency induction self-heating lower die 1-2 to move upwards as a whole, achieving upsetting deformation of the semi-solid extruded part 2-2 of the well valve body, ultimately obtaining the semi-solid upsetting part 2-4 of the well valve body. Subsequently, the first integral motor rotor screw 1-3 and the second integral motor rotor screw 1-4 rotate, driving the two nut-type moving crossbeams 1-5 to move upwards to a suitable height. Finally, the second-stage piston 2-3-2, the third-stage piston 2-3-3, the fourth-stage piston 2-3-4, and the fifth-stage piston 2-3-5 of the multi-stage hydraulic cylinder 2-3 work simultaneously, causing the middle part 1-2-2 of the medium-frequency induction self-heating lower mold 1-2 to move upward, pushing the final formed semi-solid extrusion die 2-4 of the well valve cylindrical body upward until it stops above the position of the medium-frequency induction self-heating lower mold 1-2, at which point the final formed semi-solid extrusion die 2-4 of the well valve cylindrical body can be removed.

[0022] like Figure 3As shown, corresponding to the chip spin-extrusion induced semi-solid extrusion upsetting process of the cylindrical valve body of the well valve, the chip spin-extrusion induced semi-solid extrusion upsetting device 3 of the cylindrical valve body includes a U-shaped frame base 3-1 of the forming device, and a crossbeam 3-2 fixedly connected to the upper end of the U-shaped frame base 3-1. A second servo motor 3-3 and a third servo motor 3-4 are mounted on the crossbeam 3-2. A first integral motor rotor screw 1-3 and a second integral motor rotor screw 1-4 are installed inside the second servo motor 3-3 and the third servo motor 3-4, respectively. The lower ends of the first integral motor rotor screw 1-3 and the second integral motor rotor screw 1-4 are mounted on the U-shaped frame base 3-1 of the forming device. The first integral motor rotor screw 1-3 and the second integral motor rotor screw 1-4 are fitted with two nut-type moving crossbeams 1-5. The upper end of the two nut-type moving crossbeams 1-5 is fitted with a first servo motor 1-7. The lower end of the output shaft of the first servo motor 1-7 is fixedly connected to a medium-frequency induction self-heating upper mold 1-6. The lower end of the U-shaped frame base 3-1 of the forming device is fixedly fitted with a multi-stage hydraulic cylinder 2-3. The upper end of the multi-stage hydraulic cylinder 2-3 is fixedly fitted with a medium-frequency induction self-heating lower mold 1-2.

[0023] The principle of the chip spin extrusion induced semi-solid extrusion upsetting device used in this invention is as follows:

[0024] Reference Figure 3 As shown, the device includes a U-shaped frame base 3-1 for forming equipment. A crossbeam 3-2 is fixedly connected to the upper end of the U-shaped frame base 3-1. A second servo motor 3-3 and a third servo motor 3-4 are mounted on the crossbeam 3-2. Both the second servo motor 3-3 and the third servo motor 3-4 have a first integral motor rotor screw 1-3 and a second integral motor rotor screw 1-4 installed inside them. The lower ends of the first integral motor rotor screw 1-3 and the second integral motor rotor screw 1-4 are mounted on the U-shaped frame base 3-1. Two nut-type movable crossbeams 1-5 are fitted onto the first integral motor rotor screw 1-3 and the second integral motor rotor screw 1-4. When the second servo motor 3-3 and the third servo motor 3-4 are working, the first integral motor rotor screw 1-3 and the second integral motor rotor screw 1-4 rotate, which drives the two nut-type movable crossbeams 1-5 to reciprocate linearly upward or downward.

[0025] Reference Figure 3 As shown, when the two nut-type moving crossbeams 1-5 descend to a certain position, the first servo motor 1-7 is installed at the upper end of the two nut-type moving crossbeams 1-5, and the lower end of the output shaft of the first servo motor 1-7 is fixedly connected to the medium-frequency induction self-heating upper mold 1-6. Therefore, when the first servo motor 1-7 is working, it can drive the medium-frequency induction self-heating upper mold 1-6 to rotate.

[0026] Reference Figure 1 , Figure 2 and Figure 3 As shown, when the second servo motor 3-3, the third servo motor 3-4 and the first servo motor 1-7 work simultaneously, they can drive the medium-frequency induction self-heating upper mold 1-6 to perform both linear and rotary motion. In particular, it can achieve "the medium-frequency induction self-heating upper mold 1-6 to perform both downward and rotary motion", that is, downward "rotational feeding", which can realize the rotational extrusion deformation of the chip fragments 1-1. While increasing the deformation amount of the chip fragments 1-1, it can also obtain the rotary extrusion solid preform 1-8 of the well valve cylindrical valve body chip.

[0027] Reference Figure 1 , Figure 2 and Figure 3 As shown, when the semi-solid fine spherulite material 2-1 has been prepared, the first integral motor rotor screw 1-3 and the second integral motor rotor screw 1-4 can be controlled to rotate to drive the two nut-type moving crossbeams 1-5 to move downward, so that the medium frequency induction self-heating upper mold 1-6 moves downward to achieve the initial extrusion deformation of the semi-solid fine spherulite material 2-1, thereby obtaining the semi-solid extruded forming part 2-2 of the well valve cylindrical valve body.

[0028] Reference Figure 1 , Figure 2 and Figure 3 As shown, after obtaining the semi-solid extruded part 2-2 of the well valve body, the medium-frequency induction self-heating upper mold 1-6 is kept stationary, and the first-stage piston 2-3-1 of the multi-stage hydraulic cylinder 2-3 is controlled to work, pushing the medium-frequency induction self-heating lower mold 1-2 to move upward as a whole, thereby realizing the upsetting deformation of the semi-solid extruded part 2-2 of the well valve body, and finally obtaining the semi-solid extruded upsetting part 2-4 of the well valve body.

Claims

1. A forming process based on a semi-solid extrusion upsetting device induced by spun extrusion of cylindrical valve body chips for well valves, characterized in that, The forming apparatus includes: The forming device has a U-shaped frame base; a crossbeam is fixedly connected to the upper end of the U-shaped frame base, and a second servo motor and a third servo motor are mounted on the crossbeam; the output ends of the second servo motor and the third servo motor are connected to a first integral motor rotor screw and a second integral motor rotor screw, and the lower ends of the first integral motor rotor screw and the second integral motor rotor screw are mounted on the U-shaped frame base; two nut-type moving crossbeams are fitted on the first integral motor rotor screw and the second integral motor rotor screw, and a first servo motor is mounted on the upper end of the two nut-type moving crossbeams; the lower end of the output shaft of the first servo motor is fixedly connected to a medium-frequency induction self-heating upper mold; a multi-stage hydraulic cylinder is fixedly mounted on the lower end of the U-shaped frame base, and a medium-frequency induction self-heating lower mold is fixedly mounted on the upper end of the multi-stage hydraulic cylinder. The forming process includes the following steps: Step 1. Complete the rotary extrusion solid preforming of the cylindrical valve body chips for the well valve. First, place the chip fragments into the medium-frequency induction self-heating lower mold. Then, control the rotation of the first integral motor rotor screw and the second integral motor rotor screw to cause the two nut-type moving crossbeams installed in conjunction with the first integral motor rotor screw and the second integral motor rotor screw to move downward, driving the medium-frequency induction self-heating upper mold to move downward and gradually flatten the chip fragments. Then, control the rotation of the first servo motor installed on the upper side of the two nut-type moving crossbeams to drive the rotation of the medium-frequency induction self-heating upper mold which is fixed to the output shaft of the first servo motor. At the same time, control the rotation of the first integral motor rotor screw and the second integral motor rotor screw to drive the two nut-type moving crossbeams to move downward, causing the medium-frequency induction self-heating upper mold to move downward and realize the rotary extrusion deformation of the chip fragments, increasing the deformation of the chip fragments while obtaining the rotary extrusion solid preform of the cylindrical valve body chips for the well valve. Step 2. Prepare semi-solid spherulite material and perform extrusion upsetting on the rotary extrusion solid preform of the well valve body obtained in Step 1. First, use a first induction heating coil distributed inside the upper die and a first induction heating coil distributed inside the lower die to simultaneously heat the upper and lower dies, heating the rotary extrusion solid preform of the well valve body to the semi-solid temperature range of the chip material and holding it at that temperature to obtain semi-solid fine spherulite material with a diameter of 30~50μm and an average shape factor ≥0.

6. Next, control the rotation of the first and second integral motor rotor screws to drive the two nut-type moving crossbeams to move downwards, causing the upper die to move downwards, thus achieving the initial extrusion of the semi-solid fine spherulite material. The process involves several steps: First, deformation is performed to obtain a semi-solid extruded well valve body. Then, the upper die is kept stationary by controlling the medium-frequency induction self-heating type, while the first-stage piston of the multi-stage hydraulic cylinder is activated, pushing the lower die upwards to achieve upsetting deformation of the semi-solid extruded well valve body, ultimately obtaining a semi-solid upset well valve body. Next, the first and second integral motor rotor screws are rotated to drive the two nut-type moving crossbeams upwards to a preset height. Finally, multiple pistons of the multi-stage hydraulic cylinder are activated simultaneously, causing the middle part of the lower die to move upwards, pushing the final formed semi-solid upset well valve body until it reaches a position higher than the lower die, at which point the final formed semi-solid upset well valve body is removed.

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