CN113399651B - Vacuum die-casting system based on air detection and computer storage medium - Google Patents
Vacuum die-casting system based on air detection and computer storage medium Download PDFInfo
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- CN113399651B CN113399651B CN202110706538.4A CN202110706538A CN113399651B CN 113399651 B CN113399651 B CN 113399651B CN 202110706538 A CN202110706538 A CN 202110706538A CN 113399651 B CN113399651 B CN 113399651B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/32—Controlling equipment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/14—Machines with evacuated die cavity
- B22D17/145—Venting means therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L21/00—Vacuum gauges
Abstract
The invention provides a vacuum die-casting system based on air detection, which comprises a model cavity, a die-casting module, an air extraction module, an air detection module and an intelligent control module, wherein the air extraction module is used for extracting air in the model cavity, the air detection module is used for detecting air pressure conditions in the model cavity and the air extraction module, the intelligent control module analyzes and controls the air extraction rate of the air extraction module according to data detected by the air detection module, and the die-casting module is used for pressing liquid metal into the model cavity under a proper air pressure condition. The intelligent control module can calculate the sealing coefficient of the system according to the air pressure value outside the model cavity, and the air pressure in the model cavity is calculated by utilizing the sealing coefficient, so that the required air pressure value in the model cavity can be achieved, and the finished product effect of the die-casting part is improved.
Description
Technical Field
The invention relates to the technical field of part manufacturing, in particular to a vacuum die-casting system based on air detection.
Background
The vacuum die casting method is an advanced die casting process for improving the mechanical property and the surface quality of die castings by eliminating or remarkably reducing air holes and dissolved air in die castings through pumping air in a die cavity of a die casting die in the die casting process.
Now a number of vacuum die casting systems have been developed, and after a number of searches and references, it has been found that the existing die casting systems are disclosed as KR101359386B1, KR101359388B1 and KR101512152B1, which comprise a valve seat, an upper valve body, a lower valve body and a valve core, wherein the lower valve body and the upper valve body are positioned above the valve seat, the valve core is provided with an upper end passing through the lower valve body and being movable therein, and a lower end positioned in a cavity of the valve seat, and the vacuum die casting system is characterized in that: the valve core is provided with an annular groove; a liquid flow passage is arranged in the lower valve body and passes through the valve core. The valve core is provided with an annular groove, and the liquid flow channel is connected with the valve core, so that the phenomenon that fins are continuously accumulated and clamped in a gap is avoided, and the valve core and the valve body are protected. However, the system does not compensate when the sealing performance of the die is poor, so that the vacuum degree during die casting does not meet the preset requirement, and the effect is further influenced.
Disclosure of Invention
The invention aims to provide a vacuum die-casting system based on air detection aiming at the defects,
in order to overcome the defects of the prior art, the invention adopts the following technical scheme:
a vacuum die-casting system based on air detection comprises a model cavity, a die-casting module, an air extraction module, an air detection module and an intelligent control module, wherein the air extraction module is used for extracting air in the model cavity;
further, the mold cavity comprises a mold shell and a mold, the mold is arranged in the mold shell, the mold shell and the mold are both provided with a liquid inlet and a ventilation outlet, the liquid inlet of the mold is tightly attached to the liquid inlet of the mold shell, and the ventilation outlet of the mold is tightly attached to the ventilation outlet of the mold shell;
furthermore, a drainage cavity is arranged between the die shell and the die, a drainage channel is arranged on the wall of the ventilation outlet of the die and communicated with the drainage cavity, and a ventilation outlet of the die shell is provided with a drainage channelHaving a first air pressure sensor for detecting a pressure value P1(t), a second air pressure sensor is arranged on the inner wall of the drainage cavity, and the detected value of the second air pressure sensor is P2(t)；
Furthermore, a third air pressure sensor is arranged in the air exhaust module, and the detected air pressure value is P3(t) the P3(t) a stable value P when said pumping module pumps air at a speed v3The intelligent control module is according to P3Calculating a sealing coefficient delta:
wherein, P' is standard atmospheric pressure, k is a decompression coefficient related to the system structure and is obtained through actual test;
further, said P1(t) a stable value of P1Said P is2(t) a stable value of P2And P is1、P2And P3The relationship of (1) is:
wherein, VqIs the volume of the drainage lumen, VmIs the cavity volume within the mold;
furthermore, the intelligent control module calculates the air pressure P in the model cavity through the following formulam(t)：
And P is controlled by controlling the pumping speed vm(t) Final stabilization at the target pressure P0；
Further, when saidAfter the die casting module is started, liquid metal is filled in the die cavity and enters the drain cavity through the drain channel, and P is2(t) rises with it, when P is2(t) stopping the die casting module when the following equation is satisfied;
wherein, V0The liquid metal flows into a preset volume in the drainage cavity;
further, a pipeline, communicated with the mold cavity, on the air extraction module is also provided with a gaseous metal detection device and a gaseous metal recovery device, the gaseous metal detection device is used for detecting the concentration of gaseous metal contained in air, and the gaseous metal recovery device liquefies and recovers the gaseous metal according to the concentration set cooling temperature;
a computer-readable storage medium, comprising an air-detection-based vacuum die casting system program that, when executed by a processor, performs the steps of an air-detection-based vacuum die casting system.
The beneficial effects obtained by the invention are as follows:
according to the invention, the air pressure sensors are arranged at a plurality of positions outside the die cavity, the sealing coefficient of the system is calculated by using the detected air pressure value, the air pressure value in the die cavity is compensated and calculated by using the sealing coefficient, and finally the air suction speed is controlled to enable the air pressure in the die cavity to reach the preset air pressure requirement.
Drawings
The invention will be further understood from the following description in conjunction with the accompanying drawings. The components in the figures are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the embodiments. Like reference numerals designate corresponding parts throughout the different views.
Fig. 1 is a schematic view of an overall structural framework.
Fig. 2 is a schematic diagram of a die casting process.
FIG. 3 is a schematic view of a mold cavity configuration.
Fig. 4 is a schematic diagram showing comparison of detection values of the respective air pressure sensors.
Fig. 5 is a schematic diagram illustrating changes in barometric pressure values of the second barometric pressure sensor.
Detailed Description
In order to make the objects and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the following embodiments; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Other systems, methods, and/or features of the present embodiments will become apparent to those skilled in the art upon review of the following detailed description. It is intended that all such additional systems, methods, features and advantages be included within this description, be within the scope of the invention, and be protected by the accompanying claims. Additional features of the disclosed embodiments are described in, and will be apparent from, the detailed description that follows.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not indicated or implied that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limitations of the present patent, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
The first embodiment.
A vacuum die-casting system based on air detection comprises a model cavity, a die-casting module, an air extraction module, an air detection module and an intelligent control module, wherein the air extraction module is used for extracting air in the model cavity;
the mold cavity comprises a mold shell and a mold, the mold is arranged in the mold shell, the mold shell and the mold are both provided with a liquid inlet and a ventilation outlet, the liquid inlet of the mold is tightly attached to the liquid inlet of the mold shell, and the ventilation outlet of the mold is tightly attached to the ventilation outlet of the mold shell;
a vent cavity is arranged between the die shell and the die, a vent channel is arranged on the wall of a vent outlet of the die and communicated with the vent cavity, a first air pressure sensor is arranged on the vent outlet of the die shell, and the air pressure value detected by the first air pressure sensor is P1(t), a second air pressure sensor is arranged on the inner wall of the drainage cavity, and the detected value of the second air pressure sensor is P2(t)；
A third air pressure sensor is arranged in the air extraction module, and the detected air pressure value is P3(t) the P3(t) a stable value P when said pumping module pumps air at a speed v3The intelligent control module is according to P3Calculating a sealing coefficient delta:
wherein, P' is standard atmospheric pressure, k is a decompression coefficient related to the system structure and is obtained through actual test;
the P is1(t) a stable value of P1Said P is2(t) a stable value of P2And P is1、P2And P3The relationship of (1) is:
wherein, VqIs the volume of the drainage lumen, VmIs the cavity volume within the mold;
the intelligent control module calculates the air pressure P in the model cavity through the following formulam(t)：
And P is controlled by controlling the pumping speed vm(t) Final stabilization at the target pressure P0；
When the die casting module is started, liquid metal is filled in the model cavity and enters the drain cavity through the drain channel, P2(t) rises with it, when P is2(t) stopping the die casting module when the following equation is satisfied;
wherein, V0The liquid metal flows into a preset volume in the drainage cavity;
a pipeline, communicated with the mold cavity, on the air extraction module is also provided with a gaseous metal detection device and a gaseous metal recovery device, the gaseous metal detection device is used for detecting the concentration of gaseous metal contained in the air, and the gaseous metal recovery device liquefies and recovers the gaseous metal at a set cooling temperature according to the concentration;
a computer-readable storage medium, comprising an air-detection-based vacuum die casting system program that, when executed by a processor, performs the steps of an air-detection-based vacuum die casting system.
Example two.
A vacuum die-casting system based on air detection comprises a model cavity, a die-casting module, an air extraction module, an air detection module and an intelligent control module, wherein the air extraction module is used for extracting air in the model cavity;
the mold cavity comprises a mold shell and a mold, the mold is arranged in the mold shell, the mold shell and the mold are both provided with a liquid inlet and a ventilation outlet, the liquid inlet of the mold is tightly attached to the liquid inlet of the mold shell, and the ventilation outlet of the mold is tightly attached to the ventilation outlet of the mold shell;
a vent cavity is arranged between the die shell and the die, a vent channel is arranged on the wall of a vent outlet of the die and communicated with the vent cavity, a first air pressure sensor is arranged on the vent outlet of the die shell, and the air pressure value detected by the first air pressure sensor is P1(t), a second air pressure sensor is arranged on the inner wall of the drainage cavity, and the detected value of the second air pressure sensor is P2(t)；
A third air pressure sensor is arranged in the air extraction module, and the detected air pressure value is P3(t) the P3(t) a stable value P when said pumping module pumps air at a speed v3The intelligent control module is according to P3Calculating a sealing coefficient delta:
wherein, P' is standard atmospheric pressure, k is a decompression coefficient related to the system structure and is obtained through actual test;
the P is1(t) a stable value of P1Said P is2(t) a stable value of P2And P is1、P2And P3The relationship of (1) is:
wherein, VqIs the volume of the drainage lumen, VmIs the cavity volume within the mold;
the intelligent control module calculates the air pressure P in the model cavity through the following formulam(t)：
And P is controlled by controlling the pumping speed vm(t) Final stabilization at the target pressure P0；
When the die casting module is started, liquid metal is filled in the model cavity and enters the drain cavity through the drain channel, P2(t) rises with it, when P is2(t) stopping the die casting module when the following equation is satisfied;
wherein, V0The liquid metal flows into a preset volume in the drainage cavity;
a pipeline, communicated with the mold cavity, on the air extraction module is also provided with a gaseous metal detection device and a gaseous metal recovery device, the gaseous metal detection device is used for detecting the concentration of gaseous metal contained in the air, and the gaseous metal recovery device liquefies and recovers the gaseous metal at a set cooling temperature according to the concentration;
a computer-readable storage medium, wherein the computer-readable storage medium includes an air-detection-based vacuum die-casting system program, which when executed by a processor, performs the steps of an air-detection-based vacuum die-casting system;
based on the design, the vacuum die-casting system based on air detection comprises a model cavity, a die-casting module, an air extraction module, an air detection module and an intelligent control module, wherein the air extraction module is used for extracting air in the model cavity, the air detection module is used for detecting air pressure conditions in the model cavity and the air extraction module, the intelligent control module analyzes and controls the air extraction rate of the air extraction module according to data detected by the air detection module, and the die-casting module is used for pressing liquid metal into the model cavity under a proper air pressure condition;
the mold cavity comprises a mold shell and a mold, a liquid inlet and a ventilation outlet are arranged on the mold shell, molds in various shapes can be placed in the mold shell, the mold is provided with a corresponding liquid inlet and a ventilation outlet, a double-layer sealing clamping groove is arranged on the inner wall of the liquid inlet on the mold shell, a corresponding double-layer convex ring is arranged on the outer wall of the liquid inlet of the mold, the convex ring is embedded in the sealing clamping groove, the sealing structure is used for preventing liquid metal from directly permeating between the mold and the mold shell when the liquid metal enters the mold through the liquid inlet, a liquid blocking net is arranged on the ventilation outlet of the mold and used for blocking the liquid metal from flowing to the ventilation outlet, a drainage channel is arranged above the liquid blocking net, a drainage cavity is arranged between the mold shell and the mold and communicated with the drainage cavity, the liquid metal under the action of the die casting module flows into the drain cavity through the drain channel after passing through the liquid blocking net, an inductor is arranged in the drain cavity, the inductor stops the work of the die casting module after detecting the liquid metal and plays a role of a switch, the liquid metal in the drain cavity can be recycled, and the design of the drain channel and the drain cavity can also prevent the liquid metal from flowing into the air exhaust module through the vent outlet so as to influence the use of the air exhaust module;
the mould shell comprises two mould shell halves, one side of each mould shell half is rotationally connected through a rotating device, the other side of each mould shell half is provided with a buckle, the mould shell halves are opened firstly, a mould is placed in the mould shell, and then the mould shell halves are closed and the buckles are buckled;
the air detection device comprises a plurality of air pressure sensors, wherein a first air pressure sensor is arranged on a ventilation outlet of the die shell, and the air pressure value detected by the first air pressure sensor is P1(t), a second air pressure sensor is arranged on the inner wall of the drainage cavity, and the air pressure value detected by the second air pressure sensor is P2(t), a third air pressure sensor is arranged in the air extraction module, and the air pressure value detected by the third air pressure sensor is P3(t), when the pumping module works stably, the P3(t) tends to be stable, its stable value P3Comprises the following steps:
wherein, P' is standard atmospheric pressure, and v is the pumping speed of the module of bleeding, and k is the pressure reduction coefficient of the module of bleeding, and δ is the sealing coefficient of system, the pressure reduction coefficient is decided by the structure of the module of bleeding, for the fixed value and measure through actual test, can obtain sealing coefficient δ after the transform of above-mentioned formula:
after the pumping module is operated, P1(t) and P2(t) decrease to a minimum value P after a period of time has elapsed1And P2And tends to be stable, and P2(t) is always slightly greater than P1(t) the value of the pressure P in the mouldm(t) is obtained by the following formula:
wherein, VqIs the volume of the drainage lumen, VmIs the cavity volume within the mold;
and P is1、P2And P3The relationship of (1) is:
the intelligent control module controls the air pumping speed v of the air pumping module according to the relation, so that P is enabled to be in a stable statemThe value of (t) eventually stabilizes at the target value P0；
Pm(t) stabilization at P0Then, starting the die casting module, enabling the liquid metal to slowly flow into the die, enabling part of the liquid metal to flow into the drainage channel through the liquid blocking net after the die is filled with the liquid metal, enabling the drainage cavity to be in a sealed state, and enabling P to be in a sealed state2(t) will increase with increasing liquid metal flow into the drainage chamber when P is2(t) reaching a threshold value PyAfter that, the die-casting module is closed, PyThe values of (A) are:
wherein, V0A predetermined volume for the liquid metal to flow into the drain chamber.
Example three.
A vacuum die-casting system based on air detection comprises a model cavity, a die-casting module, an air extraction module, an air detection module and an intelligent control module, wherein the air extraction module is used for extracting air in the model cavity;
the mold cavity comprises a mold shell and a mold, the mold is arranged in the mold shell, the mold shell and the mold are both provided with a liquid inlet and a ventilation outlet, the liquid inlet of the mold is tightly attached to the liquid inlet of the mold shell, and the ventilation outlet of the mold is tightly attached to the ventilation outlet of the mold shell;
a vent cavity is arranged between the die shell and the die, a vent channel is arranged on the wall of a vent outlet of the die and communicated with the vent cavity, a first air pressure sensor is arranged on the vent outlet of the die shell, and the air pressure value detected by the first air pressure sensor is P1(t), a second air pressure sensor is arranged on the inner wall of the drainage cavity, and the detected value of the second air pressure sensor is P2(t)；
A third air pressure sensor is arranged in the air extraction module, and the detected air pressure value is P3(t) the P3(t) a stable value P when said pumping module pumps air at a speed v3The intelligent control module is according to P3Calculating a sealing coefficient delta:
wherein, P' is standard atmospheric pressure, k is a decompression coefficient related to the system structure and is obtained through actual test;
the P is1(t) a stable value of P1Said P is2(t) a stable value of P2And P is1、P2And P3The relationship of (1) is:
wherein, VqIs the volume of the drainage lumen, VmIs the cavity volume within the mold;
the intelligent control module calculates the air pressure P in the model cavity through the following formulam(t)：
And P is controlled by controlling the pumping speed vm(t) Final stabilization at the target pressure P0；
When the die casting module is started, liquid metal is filled in the model cavity and enters the drain cavity through the drain channel, P2(t) rises with it, when P is2(t) stopping the die casting module when the following equation is satisfied;
wherein, V0The liquid metal flows into a preset volume in the drainage cavity;
a pipeline, communicated with the mold cavity, on the air extraction module is also provided with a gaseous metal detection device and a gaseous metal recovery device, the gaseous metal detection device is used for detecting the concentration of gaseous metal contained in the air, and the gaseous metal recovery device liquefies and recovers the gaseous metal at a set cooling temperature according to the concentration;
a computer-readable storage medium, wherein the computer-readable storage medium includes an air-detection-based vacuum die-casting system program, which when executed by a processor, performs the steps of an air-detection-based vacuum die-casting system;
based on the design, the vacuum die-casting system based on air detection comprises a model cavity, a die-casting module, an air extraction module, an air detection module and an intelligent control module, wherein the air extraction module is used for extracting air in the model cavity, the air detection module is used for detecting air pressure conditions in the model cavity and the air extraction module, the intelligent control module analyzes and controls the air extraction rate of the air extraction module according to data detected by the air detection module, and the die-casting module is used for pressing liquid metal into the model cavity under a proper air pressure condition;
the mold cavity comprises a mold shell and a mold, a liquid inlet and a ventilation outlet are arranged on the mold shell, molds in various shapes can be placed in the mold shell, the mold is provided with a corresponding liquid inlet and a ventilation outlet, a double-layer sealing clamping groove is arranged on the inner wall of the liquid inlet on the mold shell, a corresponding double-layer convex ring is arranged on the outer wall of the liquid inlet of the mold, the convex ring is embedded in the sealing clamping groove, the sealing structure is used for preventing liquid metal from directly permeating between the mold and the mold shell when the liquid metal enters the mold through the liquid inlet, a liquid blocking net is arranged on the ventilation outlet of the mold and used for blocking the liquid metal from flowing to the ventilation outlet, a drainage channel is arranged above the liquid blocking net, a drainage cavity is arranged between the mold shell and the mold and communicated with the drainage cavity, the liquid metal under the action of the die casting module flows into the drain cavity through the drain channel after passing through the liquid blocking net, an inductor is arranged in the drain cavity, the inductor stops the work of the die casting module after detecting the liquid metal and plays a role of a switch, the liquid metal in the drain cavity can be recycled, and the design of the drain channel and the drain cavity can also prevent the liquid metal from flowing into the air exhaust module through the vent outlet so as to influence the use of the air exhaust module;
the mould shell comprises two mould shell halves, one side of each mould shell half is rotationally connected through a rotating device, the other side of each mould shell half is provided with a buckle, the mould shell halves are opened firstly, a mould is placed in the mould shell, and then the mould shell halves are closed and the buckles are buckled;
the air detection device comprises a plurality of air pressure sensors, wherein a first air pressure sensor is arranged on a ventilation outlet of the die shell, and the air pressure value detected by the first air pressure sensor is P1(t), a second air pressure sensor is arranged on the inner wall of the drainage cavity, and the air pressure value detected by the second air pressure sensor is P2(t)A third air pressure sensor is arranged in the air extraction module, and the air pressure value detected by the third air pressure sensor is P3(t), when the pumping module works stably, the P3(t) tends to be stable, its stable value P3Comprises the following steps:
wherein, P' is standard atmospheric pressure, and v is the pumping speed of the module of bleeding, and k is the pressure reduction coefficient of the module of bleeding, and δ is the sealing coefficient of system, the pressure reduction coefficient is decided by the structure of the module of bleeding, for the fixed value and measure through actual test, can obtain sealing coefficient δ after the transform of above-mentioned formula:
after the pumping module is operated, P1(t) and P2(t) decrease to a minimum value P after a period of time has elapsed1And P2And tends to be stable, and P2(t) is always slightly greater than P1(t) the value of the pressure P in the mouldm(t) is obtained by the following formula:
wherein, VqIs the volume of the drainage lumen, VmIs the cavity volume within the mold;
and P is1、P2And P3The relationship of (1) is:
the intelligent control module controls the air pumping speed v of the air pumping module according to the relation, so that P is enabled to be in a stable statemThe value of (t) eventually stabilizes at the target value P0；
Pm(t) stabilization at P0Then, starting the die casting module, enabling the liquid metal to slowly flow into the die, enabling part of the liquid metal to flow into the drainage channel through the liquid blocking net after the die is filled with the liquid metal, enabling the drainage cavity to be in a sealed state, and enabling P to be in a sealed state2(t) will increase with increasing liquid metal flow into the drainage chamber when P is2(t) reaching a threshold value PyAfter that, the die-casting module is closed, PyThe values of (A) are:
wherein, V0The liquid metal flows into a preset volume in the drainage cavity;
the air extraction module comprises a vacuum tank and a vacuum pump, the vacuum pump is connected between an air outlet of the model cavity and the vacuum pump, the third air pressure sensor is installed in the vacuum tank, the vacuum pump comprises a pump shell, a pump chamber is arranged in the pump shell, the pump chamber is respectively communicated with an air inlet and an air outlet, a main rotor and an auxiliary rotor are arranged in the pump chamber, air flows into the pump chamber from the air inlet under the action of the main rotor and the auxiliary rotor and then flows out of the pump chamber from the air outlet, a low-pressure area is formed in the pump chamber, an air pressure difference is formed between the vacuum tank and the pump chamber, so that the air in the vacuum tank continuously flows into the pump chamber until the air pressure in the vacuum tank is the same as the air pressure in the pump chamber, the main rotor is fixedly installed in the central area of the pump chamber through a rotating shaft, and the auxiliary rotor is fixedly installed at the air outlet through the rotating shaft, the main rotor includes the multi-disc flabellum, the flabellum is the arc, the direction of the directional centre of a circle of flabellum with main rotor's direction of rotation is the same, the flabellum will a plurality of subchambers are cut apart into to the pump chamber, when gas in the subchamber rotates to gas outlet department the partial gas of effect of auxiliary rotor is followed the gas outlet flows out, makes the atmospheric pressure in the subchamber reduce, rotates again during to the gas inlet, gas in the vacuum tank supplyes extremely the subchamber, continuous repetitive cycle finally makes atmospheric pressure in the vacuum tank reduces to stable value.
Example four.
A vacuum die-casting system based on air detection comprises a model cavity, a die-casting module, an air extraction module, an air detection module and an intelligent control module, wherein the air extraction module is used for extracting air in the model cavity;
the mold cavity comprises a mold shell and a mold, the mold is arranged in the mold shell, the mold shell and the mold are both provided with a liquid inlet and a ventilation outlet, the liquid inlet of the mold is tightly attached to the liquid inlet of the mold shell, and the ventilation outlet of the mold is tightly attached to the ventilation outlet of the mold shell;
a vent cavity is arranged between the die shell and the die, a vent channel is arranged on the wall of a vent outlet of the die and communicated with the vent cavity, a first air pressure sensor is arranged on the vent outlet of the die shell, and the air pressure value detected by the first air pressure sensor is P1(t), a second air pressure sensor is arranged on the inner wall of the drainage cavity, and the detected value of the second air pressure sensor is P2(t)；
A third air pressure sensor is arranged in the air extraction module, and the detected air pressure value is P3(t) the P3(t) a stable value P when said pumping module pumps air at a speed v3The intelligent control module is according to P3Calculating a sealing coefficient delta:
wherein, P' is standard atmospheric pressure, k is a decompression coefficient related to the system structure and is obtained through actual test;
the P is1(t) a stable value of P1Said P is2(t) a stable value of P2And P is1、P2And P3The relationship of (1) is:
wherein, VqIs the volume of the drainage lumen, VmIs the cavity volume within the mold;
the intelligent control module calculates the air pressure P in the model cavity through the following formulam(t)：
And P is controlled by controlling the pumping speed vm(t) Final stabilization at the target pressure P0；
When the die casting module is started, liquid metal is filled in the model cavity and enters the drain cavity through the drain channel, P2(t) rises with it, when P is2(t) stopping the die casting module when the following equation is satisfied;
wherein, V0The liquid metal flows into a preset volume in the drainage cavity;
a pipeline, communicated with the mold cavity, on the air extraction module is also provided with a gaseous metal detection device and a gaseous metal recovery device, the gaseous metal detection device is used for detecting the concentration of gaseous metal contained in the air, and the gaseous metal recovery device liquefies and recovers the gaseous metal at a set cooling temperature according to the concentration;
a computer-readable storage medium, wherein the computer-readable storage medium includes an air-detection-based vacuum die-casting system program, which when executed by a processor, performs the steps of an air-detection-based vacuum die-casting system;
based on the design, the vacuum die-casting system based on air detection comprises a model cavity, a die-casting module, an air extraction module, an air detection module and an intelligent control module, wherein the air extraction module is used for extracting air in the model cavity, the air detection module is used for detecting air pressure conditions in the model cavity and the air extraction module, the intelligent control module analyzes and controls the air extraction rate of the air extraction module according to data detected by the air detection module, and the die-casting module is used for pressing liquid metal into the model cavity under a proper air pressure condition;
the mold cavity comprises a mold shell and a mold, a liquid inlet and a ventilation outlet are arranged on the mold shell, molds in various shapes can be placed in the mold shell, the mold is provided with a corresponding liquid inlet and a ventilation outlet, a double-layer sealing clamping groove is arranged on the inner wall of the liquid inlet on the mold shell, a corresponding double-layer convex ring is arranged on the outer wall of the liquid inlet of the mold, the convex ring is embedded in the sealing clamping groove, the sealing structure is used for preventing liquid metal from directly permeating between the mold and the mold shell when the liquid metal enters the mold through the liquid inlet, a liquid blocking net is arranged on the ventilation outlet of the mold and used for blocking the liquid metal from flowing to the ventilation outlet, a drainage channel is arranged above the liquid blocking net, a drainage cavity is arranged between the mold shell and the mold and communicated with the drainage cavity, the liquid metal under the action of the die casting module flows into the drain cavity through the drain channel after passing through the liquid blocking net, an inductor is arranged in the drain cavity, the inductor stops the work of the die casting module after detecting the liquid metal and plays a role of a switch, the liquid metal in the drain cavity can be recycled, and the design of the drain channel and the drain cavity can also prevent the liquid metal from flowing into the air exhaust module through the vent outlet so as to influence the use of the air exhaust module;
the mould shell comprises two mould shell halves, one side of each mould shell half is rotationally connected through a rotating device, the other side of each mould shell half is provided with a buckle, the mould shell halves are opened firstly, a mould is placed in the mould shell, and then the mould shell halves are closed and the buckles are buckled;
the air detection device comprises a plurality of air pressure sensors, wherein a first air pressure sensor is arranged on a ventilation outlet of the die shell, and the air pressure value detected by the first air pressure sensor is P1(t), a second air pressure sensor is arranged on the inner wall of the drainage cavity, and the air pressure value detected by the second air pressure sensor is P2(t), a third air pressure sensor is arranged in the air extraction module, and the air pressure value detected by the third air pressure sensor is P3(t), when the pumping module works stably, the P3(t) tends to be stable, its stable value P3Comprises the following steps:
wherein, P' is standard atmospheric pressure, and v is the pumping speed of the module of bleeding, and k is the pressure reduction coefficient of the module of bleeding, and δ is the sealing coefficient of system, the pressure reduction coefficient is decided by the structure of the module of bleeding, for the fixed value and measure through actual test, can obtain sealing coefficient δ after the transform of above-mentioned formula:
after the pumping module is operated, P1(t) and P2(t) decrease to a minimum value P after a period of time has elapsed1And P2And tends to be stable, and P2(t) is always slightly greater than P1(t) the value of the pressure P in the mouldm(t) is obtained by the following formula:
wherein, VqIs the volume of the drainage lumen, VmIs the cavity volume within the mold;
and P is1、P2And P3The relationship of (1) is:
the intelligent control module controls the air pumping speed v of the air pumping module according to the relation, so that P is enabled to be in a stable statemThe value of (t) eventually stabilizes at the target value P0；
Pm(t) stabilization at P0Then, starting the die casting module, enabling the liquid metal to slowly flow into the die, enabling part of the liquid metal to flow into the drainage channel through the liquid blocking net after the die is filled with the liquid metal, enabling the drainage cavity to be in a sealed state, and enabling P to be in a sealed state2(t) will increase with increasing liquid metal flow into the drainage chamber when P is2(t) reaching a threshold value PyAfter that, the die-casting module is closed, PyThe values of (A) are:
wherein, V0The liquid metal flows into a preset volume in the drainage cavity;
the air extraction module comprises a vacuum tank and a vacuum pump, the vacuum pump is connected between an air outlet of the model cavity and the vacuum pump, the third air pressure sensor is installed in the vacuum tank, the vacuum pump comprises a pump shell, a pump chamber is arranged in the pump shell, the pump chamber is respectively communicated with an air inlet and an air outlet, a main rotor and an auxiliary rotor are arranged in the pump chamber, air flows into the pump chamber from the air inlet under the action of the main rotor and the auxiliary rotor and then flows out of the pump chamber from the air outlet, a low-pressure area is formed in the pump chamber, an air pressure difference is formed between the vacuum tank and the pump chamber, so that the air in the vacuum tank continuously flows into the pump chamber until the air pressure in the vacuum tank is the same as the air pressure in the pump chamber, the main rotor is fixedly installed in the central area of the pump chamber through a rotating shaft, and the auxiliary rotor is fixedly installed at the air outlet through the rotating shaft, the main rotor comprises a plurality of fan blades, the fan blades are arc-shaped, the direction of the fan blades pointing to the circle center is the same as the rotating direction of the main rotor, the pump chamber is divided into a plurality of sub-chambers by the fan blades, when the gas in the sub-chambers rotates to the gas outlet, part of the gas flows out from the gas outlet under the action of the auxiliary rotor, so that the gas pressure in the sub-chambers is reduced, when the gas rotates to the gas inlet, the gas in the vacuum tank is supplemented to the sub-chambers, the gas is continuously recycled, and finally the gas pressure in the vacuum tank is reduced to a stable value;
the air detection system also comprises a gaseous metal detector, the gaseous metal detector is arranged on the inner wall of the pipeline connected between the vacuum tank and the model cavity, as the liquid metal in the model cavity is in a high-temperature low-pressure state, part of the liquid metal can be gasified and enters the pipeline along with the air, and if the gaseous metal is not treated, the gaseous metal can directly enter the vacuum tank or even the vacuum pump, so that the use of the vacuum pump is influenced;
the gas metal detector is internally provided with a detection channel, one side of the detection channel is provided with a micro air hole, air flow can be ejected out of the micro air hole, the other side of the detection channel is provided with a collision sensing film, a micro sensing element is arranged on the collision sensing film, air in the channel can collide against the collision sensing film under the action of the air flow, the sensing element can only react to the collision of the gas metal by setting a sensing value because the gas metal has larger mass than different gas molecules, and the concentration of the gas metal in the air can be graded by the number of the sensing elements reacting on the collision sensing film;
gaseous state metal detector with be equipped with gaseous state metal recovery unit between the vacuum tank, gaseous state metal recovery unit includes cooling net and accumulator, the accumulator is located cooling net below, the cooling net links to each other with a temperature control device, temperature control device sets up different cooling temperature according to the concentration grade of gaseous state metal, and gaseous state metal in the air can cool off the liquefaction and instil into in the accumulator of below when passing through the cooling net, the accumulator surface scribbles the release agent, prevent after the liquid metal solidification with the accumulator is together glutinous.
Although the invention has been described above with reference to various embodiments, it should be understood that many changes and modifications may be made without departing from the scope of the invention. That is, the methods, systems, and devices discussed above are examples. Various configurations may omit, substitute, or add various procedures or components as appropriate. For example, in alternative configurations, the methods may be performed in an order different than that described, and/or various components may be added, omitted, and/or combined. Moreover, features described with respect to certain configurations may be combined in various other configurations, as different aspects and elements of the configurations may be combined in a similar manner. Further, elements therein may be updated as technology evolves, i.e., many elements are examples and do not limit the scope of the disclosure or claims.
Specific details are given in the description to provide a thorough understanding of the exemplary configurations including implementations. However, configurations may be practiced without these specific details, for example, well-known circuits, processes, algorithms, structures, and techniques have been shown without unnecessary detail in order to avoid obscuring the configurations. This description provides example configurations only, and does not limit the scope, applicability, or configuration of the claims. Rather, the foregoing description of the configurations will provide those skilled in the art with an enabling description for implementing the described techniques. Various changes may be made in the function and arrangement of elements without departing from the spirit or scope of the disclosure.
In conclusion, it is intended that the foregoing detailed description be regarded as illustrative rather than limiting, and that it be understood that these examples are illustrative only and are not intended to limit the scope of the invention. After reading the description of the invention, the skilled person can make various changes or modifications to the invention, and these equivalent changes and modifications also fall into the scope of the invention defined by the claims.
Claims (3)
1. A vacuum die-casting system based on air detection comprises a model cavity, a die-casting module, an air extraction module, an air detection module and an intelligent control module, wherein the air extraction module is used for extracting air in the model cavity; the mold cavity comprises a mold shell and a mold, the mold is arranged in the mold shell, the mold shell and the mold are both provided with a liquid inlet and a ventilation outlet, the liquid inlet of the mold is tightly attached to the liquid inlet of the mold shell, and the ventilation outlet of the mold is tightly attached to the ventilation outlet of the mold shell; a vent cavity is arranged between the die shell and the die, a vent channel is arranged on the wall of a vent outlet of the die and communicated with the vent cavity, a first air pressure sensor is arranged on the vent outlet of the die shell, and the air pressure value detected by the first air pressure sensor is P1(t), a second air pressure sensor is arranged on the inner wall of the drainage cavity, and the detected air pressure value is P2(t); a third air pressure sensor is arranged in the air extraction module, and the detected air pressure value is P3(t) the P3(t) a stable value P when said pumping module pumps air at a pumping rate v3The intelligent control module is according to P3Calculating a sealing coefficient delta:
wherein, P' is standard atmospheric pressure, k is a decompression coefficient related to the system structure and is obtained through actual test; the P is1(t) a stable value of P1Said P is2(t) a stable value of P2And P is1、P2And P3The relationship of (1) is:
wherein, VqIs the volume of the drainage lumen, VmIs the cavity volume within the mold; the intelligent control module calculates the air pressure P in the model cavity through the following formulam(t)：
And P is controlled by controlling the pumping speed vm(t) Final stabilization at the target pressure P0。
2. The air detection-based vacuum die casting system of claim 1, wherein when said die casting module is started, liquid metal fills said mold cavity and enters a drain cavity through said drain channel, P2(t) rises with it, when P is2(t) stopping the die casting module when the following equation is satisfied;
wherein, V0For liquid metal to flow into the draining chamberSetting the volume.
3. The vacuum die-casting system based on air detection as claimed in claim 2, wherein a pipeline of the air-extracting module, which is communicated with the mold cavity, is further provided with a gaseous metal detection device and a gaseous metal recovery device, the gaseous metal detection device is used for detecting the concentration of the gaseous metal contained in the air, and the gaseous metal recovery device is used for liquefying and recovering the gaseous metal according to the cooling temperature set by the concentration of the gaseous metal.
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