Disclosure of Invention
To solve the problems set forth in the background art. The invention provides a titanium-nickel tube forming method, which solves the technical problem of poor welding quality.
In order to achieve the above purpose, the present invention provides the following technical solutions:
The method for forming the titanium-nickel tube as one embodiment comprises the following steps: step one: the seamless titanium-nickel tube blank is extruded and molded for one time according to a preset size to obtain a semi-finished product, and the semi-finished product is subjected to heat treatment, wherein the heat treatment is to heat the semi-finished product to 675-725 ℃, and the heat preservation is carried out for 9-11 hours; step two: and (3) secondarily extruding the semi-finished product subjected to heat treatment to form a titanium-nickel tube finished product, and finally carrying out heat treatment on the finished product.
In one or more embodiments of the invention, the primary extrusion and/or the secondary extrusion is cold extrusion.
In one or more embodiments of the present invention, the extrusion speed of the cold extrusion is 30 to 40mm/min.
In one or more embodiments of the invention, the cold extrusion applies a pressure of 100 to 2000 kg force.
In one or more embodiments of the present invention, the final product of the second step is heat treated to a final product at a holding temperature of 600±10 ℃ for a holding time of: 1-2 minutes per wall thickness (per mm); after heat preservation, the finished product is quickly immersed in room temperature aqueous solution, and is driven by machinery to rotate for 2-20 revolutions per minute, meanwhile, water jet is formed in the inner cavity of the tube, and the tube is naturally cooled after the temperature is reduced to below 290 ℃.
In one or more embodiments of the invention, the high pressure water stream is formed by a high pressure nozzle that sprays in the tube lumen.
In one or more embodiments of the present invention, the injection direction of the high pressure nozzle is an axial direction.
In one or more embodiments of the invention, the high pressure nozzle is disposed along the inner wall and offset from the centerline of the titanium nickel tube.
In one or more embodiments of the present invention, the high pressure nozzle is spaced from the inner wall by a distance of (1/3-1/4) R, where R is the radius of the tube cross-section where the corresponding high pressure nozzle orifice is located.
In one or more embodiments of the invention, the incubation time is at an incubation temperature of 600 ℃ ± 10 ℃): 1 minute/wall thickness (per millimeter) and not less than 30 minutes incubation time; after heat preservation, putting the titanium-nickel tube into a pool of 25 ℃ aqueous solution within 20 seconds, immersing the outer surface of the titanium-nickel tube into water, mechanically driving the titanium-nickel tube to rotate at 2 revolutions per minute, cooling the inner hole by using a high-pressure water pump flushing method at a cooling rate of 280 ℃/minute, and naturally cooling the titanium-nickel tube after the temperature of the titanium-nickel tube is reduced to below 290 ℃.
In one or more embodiments of the present invention, the titanium nickel tube forming method of the present invention may be performed as follows: after blanking the seamless titanium-nickel pipe according to a preset size, placing the seamless titanium-nickel pipe in a semi-cylindrical cavity of a lower die, starting a booster oil pump, driving an upper die to move downwards by an upper cylinder action, locking the upper die and the lower die, and driving two pushing heads to start extrusion by synchronous action of two side cylinders when the pressure reaches a preset value; the two ends of the seamless titanium-nickel pipe are extruded by the push heads, and the seamless titanium-nickel pipe is extruded from the semi-cylindrical cavities of the upper die and the lower die. After half of the molding is performed, the two side cylinders return, the two pushing heads are withdrawn, the upper die is pulled upwards by the upper cylinder return, the semi-finished product is taken out, and the semi-finished product is subjected to heat treatment; and (3) placing the semi-finished product subjected to heat treatment in a semi-cylindrical cavity of the lower die, repeating the above steps until the two cylinders at two sides reach a preset size, withdrawing the two pushing heads, pulling the upper die upwards by the return stroke of the upper cylinder, taking out a seamless three-dimensional four-way finished product, and finally performing heat treatment on the finished product.
In one or more embodiments of the present invention, a cold extrusion apparatus includes an upper die, a lower die, an upper cylinder, a side cylinder, a pusher, a booster pump, and a fuel tank.
In one or more embodiments of the present invention, the upper die and the lower die are arranged in a vertically-opposite manner, and semi-cylindrical concave cavities which are symmetrically arranged with each other are arranged on the lower end surface of the upper die and the upper end surface of the lower die.
In one or more embodiments of the present invention, the upper end surface of the upper die is provided with a branch pipe cavity, and the right end surface of the lower die is provided with a branch pipe cavity.
In one or more embodiments of the present invention, the upper mold and the lower mold are combined up and down to form a three-dimensional four-way mold.
Compared with the prior art, the invention has the beneficial effects that:
According to the titanium-nickel pipe forming method, the titanium-nickel three-dimensional four-way pipe fitting can uniformly distribute and convey the medium of the main pipeline to a plurality of branch pipelines, and can uniformly and intensively convey the medium of a plurality of pipelines to one main pipeline, so that the safety coefficient and the service life of a product are greatly improved, the production efficiency is also greatly improved, the large-scale mass production can be realized, more than 30% of materials can be saved, and the production cost is greatly reduced.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The invention provides the following technical scheme: a titanium-nickel tube forming method comprises the following steps:
step one: feeding the seamless titanium-nickel pipe into a cold extrusion molding device according to a preset size, placing the seamless titanium-nickel pipe into a semi-cylindrical cavity of a lower die, starting a booster oil pump, driving an upper die to move downwards by an upper cylinder action, locking the upper die and the lower die, and driving two push heads to start extrusion by synchronous action of two side cylinders when the pressure reaches the preset value;
step two: the two ends of the seamless titanium-nickel pipe are extruded by the push heads, the seamless titanium-nickel pipe is extruded from the semi-cylindrical cavities of the upper die and the lower die, the extrusion speed is 40mm/min, and the pressure is 100 kg force. After half of the molding, returning the cylinders at two sides, withdrawing the two pushing heads, pulling up the upper die upwards by the return stroke of the upper cylinder, taking out the semi-finished product, performing heat treatment on the semi-finished product, heating the semi-finished product to 700 ℃, and preserving heat for 9 hours;
Step three: and (3) placing the semi-finished product subjected to heat treatment in a semi-cylindrical cavity of a lower die, repeating the steps until the two cylinders at two sides reach a preset size, withdrawing the two pushing heads, pulling the upper die upwards by the upper cylinder, taking out a seamless three-dimensional four-way finished product, and finally performing heat treatment on the finished product, wherein the heat preservation time is as follows at the heat preservation temperature of 600 ℃:1 minute/wall thickness (per mm); after heat preservation, the finished product is quickly immersed in room temperature aqueous solution and is driven by machinery to rotate at 2 revolutions per minute, meanwhile, 1 high-pressure nozzles are arranged at 1/3R positions of an inner cavity and an inner wall of the pipe for example, so that water jet is formed, the jet direction is axial, R is the radius of the section of the pipe where a corresponding high-pressure nozzle is located, and after the temperature is reduced to below 290 ℃, the titanium-nickel three-dimensional four-way pipe fitting is naturally cooled.
Example 2
The invention provides the following technical scheme: a titanium-nickel tube forming method comprises the following steps:
step one: feeding the seamless titanium-nickel pipe into a cold extrusion molding device according to a preset size, placing the seamless titanium-nickel pipe into a semi-cylindrical cavity of a lower die, starting a booster oil pump, driving an upper die to move downwards by an upper cylinder action, locking the upper die and the lower die, and driving two push heads to start extrusion by synchronous action of two side cylinders when the pressure reaches the preset value;
Step two: the two ends of the seamless titanium-nickel pipe are extruded by the push heads, the seamless titanium-nickel pipe is extruded from the semi-cylindrical cavities of the upper die and the lower die, the extrusion speed is 30mm/min, and the pressure is 2000 kg force. After half of the molding, returning the cylinders at two sides, withdrawing the two pushing heads, pulling up the upper die upwards by the return stroke of the upper cylinder, taking out the semi-finished product, performing heat treatment on the semi-finished product, heating the semi-finished product to 675 ℃, and preserving heat for 10 hours;
Step three: and (3) placing the semi-finished product subjected to heat treatment in a semi-cylindrical cavity of a lower die, repeating the steps until the two cylinders at two sides reach a preset size, withdrawing the two pushing heads, pulling the upper die upwards by the upper cylinder, taking out a seamless three-dimensional four-way finished product, and finally performing heat treatment on the finished product, wherein the heat preservation time is as follows at the heat preservation temperature of 590 ℃:1.5 minutes per wall thickness (per mm); after heat preservation, the finished product is quickly immersed in room temperature aqueous solution, and is driven by a machine to rotate at 20 revolutions per minute, meanwhile, 4 high-pressure nozzles are uniformly arranged at 1/4R positions of an inner cavity and an inner wall of a pipe, so that water jet is formed, the jet direction is axial, R is the radius of the section of the pipe where a nozzle of the corresponding high-pressure nozzle is positioned, and the pipe is naturally cooled after the radius is reduced to below 290 ℃, so that the titanium-nickel three-dimensional four-way pipe fitting is formed.
Example 3
The invention provides the following technical scheme: a titanium-nickel tube forming method comprises the following steps:
step one: feeding the seamless titanium-nickel pipe into a cold extrusion molding device according to a preset size, placing the seamless titanium-nickel pipe into a semi-cylindrical cavity of a lower die, starting a booster oil pump, driving an upper die to move downwards by an upper cylinder action, locking the upper die and the lower die, and driving two push heads to start extrusion by synchronous action of two side cylinders when the pressure reaches the preset value;
step two: the two ends of the seamless titanium-nickel pipe are extruded by the push heads, the seamless titanium-nickel pipe is extruded from the semi-cylindrical cavities of the upper die and the lower die, the extrusion speed is 35mm/min, and the pressure is 1000 kg force. After half of the molding, returning the cylinders at two sides, withdrawing the two pushing heads, pulling up the upper die upwards by the return stroke of the upper cylinder, taking out the semi-finished product, performing heat treatment on the semi-finished product, heating the semi-finished product to 725 ℃, and preserving heat for 11 hours;
Step three: and (3) placing the semi-finished product subjected to heat treatment in a semi-cylindrical cavity of a lower die, repeating the steps until the two cylinders at two sides reach a preset size, withdrawing the two pushing heads, pulling the upper die upwards by the upper cylinder, taking out a seamless three-dimensional four-way finished product, and finally performing heat treatment on the finished product, wherein the heat preservation time is as follows at the heat preservation temperature of 6010 ℃:2 minutes per wall thickness (per mm); after heat preservation, the finished product is quickly immersed in room temperature aqueous solution, and is driven by a machine to rotate at 15 revolutions per minute, 2 high-pressure nozzles are uniformly arranged at 0.3R positions of an inner cavity and an inner wall of a pipe, so that water jet is formed, the jet direction is axial, R is the radius of the section of the pipe where a corresponding high-pressure nozzle is positioned, and the pipe is naturally cooled after the temperature is reduced to below 290 ℃.
The invention can uniformly distribute and convey the medium of the main pipeline to a plurality of branch pipelines, and can uniformly and intensively convey the medium of a plurality of pipelines to a main pipeline, thereby greatly improving the safety coefficient and the service life of products, greatly improving the production efficiency, realizing mass production, saving more than 30 percent of materials and greatly reducing the production cost.
Specifically, the cold extrusion forming device comprises an upper die, a lower die, an upper cylinder, a side cylinder, a push head, a booster oil pump and an oil tank. The upper die and the lower die are arranged in an up-down involution mode, and semi-cylindrical concave cavities which are symmetrically arranged are arranged on the lower end face of the upper die and the upper end face of the lower die. The upper end face of the upper die is provided with a branch pipe cavity, and the right end face of the lower die is provided with a branch pipe cavity. The upper die and the lower die are combined up and down to form a three-dimensional four-way die. These pressing apparatuses can be realized by using the prior art, and are not particularly limited herein.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that alterations, modifications, substitutions and variations may be made in the above embodiments by those skilled in the art within the scope of the invention.