CN-121972530-A - Vacuum extrusion device for preparing titanium and titanium alloy

CN121972530ACN 121972530 ACN121972530 ACN 121972530ACN-121972530-A

Abstract

The invention discloses a vacuum extrusion device for preparing titanium and titanium alloy, relates to the technical field of titanium and titanium alloy preparation, and aims to solve the problems that the sealing of the conventional device is easy to fail, the cleaning is not thorough and the temperature control precision is low. The device comprises a vacuum chamber, an extrusion rod, an air passage system, an air source distributor, a temperature monitoring module and an external control module. The working section of the extrusion rod is provided with three sections of spiral grooves, and the three sections of spiral grooves are matched with a plurality of air paths through an air path system, so that the precise coupling of dynamic sealing, self cleaning and temperature field regulation is realized. The first section of main seal spiral groove forms a high-pressure air curtain, the second section of temperature control spiral groove adjusts temperature in a self-adaptive way by means of a shape memory alloy ring, and the third section of cleaning spiral groove is deeply cleaned by utilizing a reverse suction effect. The external control module adaptively regulates and controls each gas circuit according to the temperature and impurity concentration monitoring data, so that the structure is simplified, the efficiency is improved, the quality stability of products is ensured, and the mass production requirements of high-quality titanium and titanium alloy are met.

Inventors

ZHU JUN
SUN DONGBAI
JIAO SHUQIANG
LIU SUNING
JING JIANFA
JIANG LILI

Assignees

兰州理工大学
南方海洋科学与工程广东省实验室(珠海)
北京科技大学
渤海大学

Dates

Publication Date: 20260505
Application Date: 20260114

Claims (8)

1. A vacuum extrusion apparatus for producing titanium and titanium alloys, comprising: The vacuum chamber is used for providing a vacuum environment required by titanium or titanium alloy extrusion, and the outer side wall of the vacuum chamber is provided with a vacuum interface; the extruding rod can do linear reciprocating motion along the axial direction of the vacuum chamber, and the working section of the extruding rod is sequentially provided with three sections of spiral grooves from front to back, wherein the three sections of spiral grooves are respectively a first section of main sealing spiral groove, a second section of temperature control spiral groove and a third section of cleaning spiral groove; The axial main air passage is penetrated and arranged along the axis of the extrusion rod and is used for conveying air flow; the radial branch air passages are vertically communicated with the axial main air passage and are uniformly distributed along the axial full length of each section of spiral groove, and the outer ends of the radial branch air passages are opened at the middle upper part of the groove wall of the corresponding spiral groove; the air source distributor is arranged at the tail part of the extrusion rod and is communicated with the axial main air passage in a sealing way, a plurality of air passage interfaces are integrated in the air source distributor and are respectively communicated with the main sealing air passage, the pulse cooling air passage, the reverse cleaning air passage and the exhaust air passage, the air passage interfaces are respectively correspondingly communicated with radial branch air passages of the specific spiral grooves, an impurity concentration sensor is arranged in the exhaust air passage, and electromagnetic valves are arranged on the air passage interfaces; The temperature monitoring module comprises temperature sensors arranged in the extrusion rod head, near a sealing ring between the extrusion rod and the vacuum chamber and in a second section of temperature control spiral groove area; And the external control module is electrically connected with the impurity concentration sensor, the temperature monitoring module, the electromagnetic valve and the air source distributor and is used for regulating and controlling the working state of each air passage according to the temperature detection data so that the extrusion device synchronously realizes the functions of dynamic sealing, self-cleaning and temperature field regulation.
2. The vacuum extrusion device for preparing titanium and titanium alloy according to claim 1, wherein the first section of main sealing spiral groove is provided with a micropore array on the groove wall close to the head of the extrusion rod, the micropore array is communicated with the pulse cooling air path, the first section of main sealing spiral groove forms a high-pressure air curtain through a forward pumping effect, and the micropore array sprays cooling air flow to the contact interface of the extrusion rod and the titanium or titanium alloy blank.
3. The vacuum extrusion device for preparing titanium and titanium alloy according to claim 1, wherein the second temperature control spiral groove adopts a variable lead structure design, an annular sleeve is arranged at a position of the extrusion rod corresponding to the second temperature control spiral groove, a shape memory alloy ring is embedded in the annular sleeve, and the shape memory alloy ring can expand or contract along with temperature change so as to change the effective flow section of the second temperature control spiral groove.
4. The vacuum extrusion device for preparing titanium and titanium alloy according to claim 1, wherein the helical teeth of the third section of cleaning helical groove are of a reverse inclined structure, deep cleaning of the extrusion rod body is achieved through a reverse suction effect during return stroke, and the reverse cleaning gas circuit can supplement gas to the third section of cleaning helical groove to enhance the entrainment effect.
5. The vacuum extrusion device for preparing titanium and titanium alloy according to claim 1, wherein the main sealing gas circuit is a constant pressure gas supply circuit for maintaining stable formation of a high pressure gas curtain; The air supply frequency of the pulse cooling air circuit is positively correlated with the temperature of the extrusion rod head detected by the temperature monitoring module; the reverse cleaning air path is selectively opened only in the return stroke stage of the extrusion rod.
6. The vacuum extrusion apparatus for producing titanium and titanium alloys of claim 1 wherein said external control module's adaptive control logic comprises: when the extrusion rod is in a forward state, the main sealing gas circuit is controlled to be opened; if the temperature of the extrusion rod head is higher than a preset threshold T1, starting a pulse cooling air path; if the temperature of the second-stage temperature control spiral groove area is higher than a preset threshold T2, adjusting a corresponding air passage valve to increase cooling flow; When the extrusion rod is in a return state, the main sealing gas circuit is controlled to reduce the pressure, and a cleaning enhancement mode is started; And if the impurity concentration monitoring value of the exhaust gas path is higher than the set threshold value, increasing the cleaning cycle times.
7. The vacuum extrusion device for preparing titanium and titanium alloys according to claim 1, wherein the first section of main seal spiral groove can reversely suck high-temperature gas and volatile matters at the extrusion interface in the return stage, and the second section of temperature control spiral groove and the first section of main seal spiral groove cooperate to realize waste heat discharge, so that heat accumulation in the vacuum chamber is avoided.
8. A vacuum extrusion apparatus for producing titanium and titanium alloys according to claim 1 wherein said vacuum chamber has a feed gate at an end thereof remote from the extrusion rod, said feed gate having a billet-positioning shoulder on a side wall thereof adjacent the vacuum chamber.

Description

Vacuum extrusion device for preparing titanium and titanium alloy Technical Field The invention relates to the technical field of titanium and titanium alloy preparation, in particular to a vacuum extrusion device for preparing titanium and titanium alloy. Background Titanium and titanium alloy have excellent properties such as high strength, corrosion resistance, high temperature resistance and the like, and are widely applied to the fields of aerospace, medical instruments, high-end equipment and the like. The process is characterized in that the stability of the vacuum environment, the controllability of the interface state of the blank and the extrusion rod and the cleanliness of the inside of the device in the extrusion process are ensured, so that quality defects such as oxidation, inclusion and adhesion of titanium or titanium alloy products are avoided. In the existing titanium and titanium alloy vacuum extrusion device, sealing, cleaning and temperature control are realized by adopting independent functional modules, wherein sealing is easy to wear due to reciprocating motion of an extrusion rod due to a static sealing element or a single air curtain structure, heat is conducted along the extrusion rod to further aggravate sealing failure, cleaning functions are mostly cleaning afterwards or blowing air in a single direction, interface volatile matters and residual impurities are difficult to thoroughly remove, temperature control is often realized by adopting an integral cooling mode, a targeted temperature gradient cannot be formed, and the problems that blanks are bonded with the extrusion rod due to local overheating of the interfaces or the plasticity of the blanks is influenced due to excessive cooling are easy to occur. The independent functional design not only makes the device structure complicated and poor in synergy, but also has the defects of large energy loss, low working efficiency and the like, and is difficult to meet the requirements of mass production of high-quality titanium and titanium alloy. Therefore, developing a vacuum extrusion device capable of precisely coupling and cooperatively working three key functions of sealing, cleaning and temperature control becomes a technical problem to be solved in the field. Disclosure of Invention The invention aims to provide a vacuum extrusion device for preparing titanium and titanium alloy, which synchronously realizes the functions of dynamic sealing, self-cleaning and temperature field regulation and control through the precise coupling design of motion, airflow and heat, and solves the problems of easy failure of sealing, incomplete cleaning and low temperature control precision of the traditional device. The invention is realized by the following technical scheme: The invention relates to a vacuum extrusion device for preparing titanium and titanium alloy, which comprises: The vacuum chamber is used for providing a vacuum environment required by titanium or titanium alloy extrusion, and the outer side wall of the vacuum chamber is provided with a vacuum interface; the extruding rod can do linear reciprocating motion along the axial direction of the vacuum chamber, and the working section of the extruding rod is sequentially provided with three sections of spiral grooves from front to back, wherein the three sections of spiral grooves are respectively a first section of main sealing spiral groove, a second section of temperature control spiral groove and a third section of cleaning spiral groove; The axial main air passage is penetrated and arranged along the axis of the extrusion rod and is used for conveying air flow; the radial branch air passages are vertically communicated with the axial main air passage and are uniformly distributed along the axial full length of each section of spiral groove, and the outer ends of the radial branch air passages are opened at the middle upper part of the groove wall of the corresponding spiral groove; the air source distributor is arranged at the tail part of the extrusion rod and is communicated with the axial main air passage in a sealing way, a plurality of air passage interfaces are integrated in the air source distributor and are respectively communicated with the main sealing air passage, the pulse cooling air passage, the reverse cleaning air passage and the exhaust air passage, the air passage interfaces are respectively correspondingly communicated with radial branch air passages of the specific spiral grooves, an impurity concentration sensor is arranged in the exhaust air passage, and electromagnetic valves are arranged on the air passage interfaces; The temperature monitoring module comprises temperature sensors arranged in the extrusion rod head, near a sealing ring between the extrusion rod and the vacuum chamber and in a second section of temperature control spiral groove area; And the external control module is electrically connected with the impurity concentration sensor, the