CN110000361B - Device and method for timely supplying metal elements for aluminum alloy low-pressure casting - Google Patents
Device and method for timely supplying metal elements for aluminum alloy low-pressure casting Download PDFInfo
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- CN110000361B CN110000361B CN201910400428.8A CN201910400428A CN110000361B CN 110000361 B CN110000361 B CN 110000361B CN 201910400428 A CN201910400428 A CN 201910400428A CN 110000361 B CN110000361 B CN 110000361B
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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
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
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Abstract
The invention relates to the field of low-pressure casting, in particular to a device and a method for timely supplying metal elements for aluminum alloy low-pressure casting. The wire feeding device comprises a rack and a motor fixed on the rack, wherein a rotating shaft is installed on a motor shaft of the motor, a wire feeding disc is detachably sleeved in the middle of the rotating shaft and fixed on the rotating shaft through a fastener, and a wire is wound on the wire feeding disc and is Mg-Sr with the diameter of 3-5 mm. The invention is characterized in that: in the heat preservation process, the metal element supplying device is used for timely adding the alloy element Mg and the alterant Sr to be introduced into the heat preservation furnace, so that the defect of element recession in the aluminum alloy can be effectively overcome, the microalloying element and the alterant can obtain excellent modification and strengthening effects again in heat preservation, the mechanical property and hardness value of the alloy are improved, and the product performance stability is ensured.
Description
Technical Field
The invention relates to the field of low-pressure casting, in particular to a device and a method for timely supplying metal elements for aluminum alloy low-pressure casting.
Background
Low pressure casting is widely used in manufacturing, and cast aluminum alloys are the most common raw materials for low pressure casting. Taking an electric power fitting product as an example, hypoeutectic or near-eutectic aluminum-silicon (Al-Si) alloy has excellent mechanical properties and formability and is widely applied. However, the eutectic silicon phase in the as-cast aluminum-silicon alloy is distributed in a needle shape, which greatly reduces the mechanical properties of the alloy, and modification and refinement treatment by adding a modifier or a refiner are required. Currently, the refiner and modifier commonly used for aluminum-silicon alloy mainly comprise aluminum boron (Al-B), aluminum titanium boron (Al-Ti-B), aluminum titanium carbon (Al-Ti-C), aluminum titanium boron rare earth (Al-Ti-B-RE), aluminum strontium (Al-Sr), Rare Earth (RE) and the like. Strontium is a surface active element and crystallographically alters the behavior of intermetallic phases. Therefore, the modification treatment by strontium element can improve the plastic processing property of the alloy and the quality of the final product. In recent years, Al — Si cast alloys have been used in place of sodium because of the advantages of long effective time for strontium modification, good effect and reproducibility, and the like. Sr is added into the Al-Si alloy, so that the morphology of eutectic silicon can be changed, the strength of the alloy is improved, the growth behavior of an alpha-Al phase is changed, more crystal nuclei are promoted to form, alloy crystal grains are refined, the strength and the plasticity of the alloy are improved, and the modifier is generally considered to be an ideal modifier.
However, when the aluminum alloy electric power fittings are prepared by low-pressure casting, 200kg of medium-frequency smelting furnace is generally used for smelting, and the alloy is transferred to a holding furnace of low-pressure casting equipment after smelting. The die-casting die adopts one die and two cavities, the weight of a product is about 2kg, and a 200kg furnace charge needs to be formed 50 times. And the time for each casting molding is about 6 minutes, so that 200kg of furnace charge needs to be kept in the heat preservation furnace for about 5 hours before being produced. The microalloying element Mg and the modified element Sr are both active and are volatilized or burnt in the heat preservation process, the element content is reduced along with the prolonging of the heat preservation time, and particularly the Sr element is basically absent after the heat preservation is carried out for 2 hours. In the aluminum alloy, Mg can form an alpha-Al solid solution in aluminum to play a role in solid solution strengthening, and can also generate an intermetallic compound Mg2Si phase in situ with silicon element to play a role in strengthening. The Sr element is used as a modifier to play a role in refining eutectic silicon and an alpha-Al phase, and the reduction of the Sr element and the alpha-Al element can certainly weaken the strengthening effect and the modification effect of the Sr element and the alpha-Al element, so that the dendritic spacing of the eutectic silicon phase in the metallurgical structure of the casting is gradually increased. Meanwhile, the size of the eutectic silicon phase grows rapidly, and the fibrous structure presented by the good initial modification effect is converted into a thick needle sheet shape, so that the degradation and decline phenomenon of the alloy is caused. The main reason for the degradation phenomenon is that most eutectic silicon phases and intermetallic compounds in the Al-Si alloy are aggregated and grown up because the modifier is not supplemented in the heat preservation process, edge corners are passivated continuously, and the Ostwald coarsening phenomenon appears, so that the effective nucleation points are reduced rapidly, and the degradation effect is obviously degraded. The decline of the alloy element Mg and the alterant Sr can also reduce the mechanical property and the hardness value of the aluminum alloy casting. And the defect of element recession in the aluminum alloy can be effectively made up by adding Mg and Sr elements in time in the heat preservation process. Compared with an alloy sample without the modifier during the heat preservation process, the micro-alloying elements and the modifier are continuously added during the heat preservation process, so that excellent modification and strengthening effects can be obtained again.
Therefore, how to design a device for timely supplying metal elements in aluminum alloy low-pressure casting, which has the advantages of simple structure, stable operation, improved mechanical property of the alloy, ensured product performance stability and improved production efficiency, is one of the research directions of technicians in the field.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the device for timely supplying the metal elements in the aluminum alloy low-pressure casting process and the method for supplying the metal elements, which have the advantages of simple structure, stable operation, improvement of the mechanical property of the alloy, guarantee of the performance stability of the product and improvement of the production efficiency.
The technical scheme of the invention is realized as follows: the utility model provides an aluminum alloy low pressure casting in time supply metal element device, includes the frame and is fixed in the motor in the frame, install the rotation axis on the motor shaft of motor, the middle part of rotation axis can be dismantled the cover and be equipped with the winding dish that unreels that supplies the silk material, it is fixed in on the rotation axis through the fastener to put the dish.
By adopting the technical scheme, in the heat preservation process, the alloying element Mg and the modifier Sr are added in time by the metal element supplying device and are introduced into the heat preservation furnace, so that the defect of element recession in the aluminum alloy can be effectively made up, the microalloying element and the modifier can obtain excellent modification and strengthening effects again in heat preservation, the mechanical property and hardness value of the alloy are improved, and the product performance stability is ensured. The device has improved cast production efficiency moreover, simple structure, operation stability.
The invention is further configured to: the low-pressure casting device is characterized by further comprising an actuating mechanism, wherein the actuating mechanism comprises an air cylinder, a cover body, a swing rod and a base plate, the shell of the air cylinder can be hinged with the outer wall of a pressure tank of the low-pressure casting device through a hinge seat, an air cylinder shaft of the air cylinder is connected with the swing rod through a sliding assembly, one end of the swing rod is hinged with the base plate, and the other end, opposite to the connecting end of the swing rod and the base plate, of the swing rod is fixedly connected with the cover body.
By adopting the technical scheme, the structure is simple, and the realization is convenient.
The invention is further configured to: the motor is characterized by also comprising a control module, wherein the control module consists of a central controller, an operation button, a starting button and a timer, the operation button, the starting button and the timer are all connected with the central controller, and the motor is connected with the central controller through a relay; the air cylinder is connected with the central controller through an electromagnetic valve.
By adopting the technical scheme, the automatic control of the device is realized, and the production efficiency is improved.
The invention is further configured to: the cover body comprises a cover body, a sealing groove is formed in the end face, facing the feeding pipe, of the cover body, a sealing column used for extending into the feeding pipe extends from the middle of the bottom of the sealing groove, a sealing cavity for inserting the pipe wall of the feeding pipe is formed between the outer wall of the sealing column and the groove wall of the sealing groove, a sealing groove is formed in the bottom of the sealing cavity, a sealing ring is arranged in the sealing groove, the outer wall of the sealing ring is mutually abutted against the groove wall of the sealing groove, an abutting groove abutted against the sealing ring is formed in the end face, facing the sealing groove, of the feeding pipe, and the abutting groove; the diameter of sealing post by keep away from the one end of seal groove toward the one end grow gradually that is close to the seal groove, the outer wall of sealing post contradict each other with the inner wall of inlet pipe.
By adopting the technical scheme, when the cover body covers the feed inlet of the feed pipe, as the diameter of the sealing column is gradually increased from one end far away from the sealing groove to one end close to the sealing groove, and the outer wall of the sealing column is mutually abutted against the inner wall of the feeding pipe, so that when the sealing column on the sealing groove is inserted into the feeding pipe, realizes gradual tightness and primary sealing, and is combined with a sealing ring arranged in the sealing groove, after the sealing ring is extruded, the sealing ring has reset force, the surface of the sealing ring is tightly attached to the end face of the inlet pipe facing the sealing groove and the sealing groove, secondary sealing is achieved, finally, the sealing performance of the joint of the cover body and the inlet pipe is improved, gas cannot escape from the joint of the cover body and the inlet pipe when compressed gas is introduced into the pressure tank, and therefore the molten metal can be smoothly introduced into a cavity of a die through the riser pipe.
The invention is further configured to: the sealing cover is characterized in that a sealing groove is formed in the cover body, a sealing column extends from the middle of the bottom of the sealing groove, a sealing cavity is formed between the outer wall of the sealing column and the wall of the sealing groove, the bottom of the sealing cavity is provided with the sealing groove, a sealing ring is arranged in the sealing groove, and the outer wall of the sealing ring is abutted against the wall of the sealing groove; the diameter of sealing post by keep away from the one end of seal groove toward the one end grow gradually that is close to the seal groove, the outer wall of sealing post contradict each other with the inner wall of inlet pipe.
Through adopting above-mentioned technical scheme, the power that resets when having improved the sealing washer and having received the extrusion, and then has improved the leakproofness of the junction of lid and inlet pipe.
The technical scheme of the invention is realized as follows: a method for supplying metal elements in time for aluminum alloy low-pressure casting is characterized in that: the method comprises the following steps:
1) pressing an operation key to start timing by a timer;
2) meanwhile, the central processing unit drives the electromagnetic valve, the electromagnetic valve drives the air cylinder, and the air cylinder shaft is ejected out to open the cover body at the moment;
3) then, pressing a start button, driving a relay by the central processing unit, driving a motor to run by the relay to rotate the unwinding disc, and feeding wires on the unwinding disc into the low-pressure casting device continuously;
4) after the timer counts a period of time, the motor is suspended to operate, and feeding to a holding furnace of the low-pressure casting device is stopped;
5) then, the central processing unit drives the electromagnetic valve again, the electromagnetic valve drives the air cylinder, and at the moment, the air cylinder shaft is recovered, so that the cover body seals a feeding hole of the low-pressure casting device.
The invention has the following beneficial effects: the device for supplying metal elements in time is utilized to realize semi-automatic feeding and casting of the aluminum alloy low-pressure casting device, so that the production efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a block diagram of a control module according to an embodiment of the present invention;
FIG. 3 is an enlarged view of portion A of FIG. 1;
FIG. 4 is a cross-sectional view of a seal ring configuration according to an embodiment of the present invention;
FIG. 5 is an as-cast microstructure of different metamorphic processes;
FIG. 6 is a microstructure of T6 heat treated for a different metamorphic process;
FIG. 7 is the mechanical property data of ZL101 alloy before and after heat treatment under different modification processes;
FIG. 8 shows the chemical composition detection results of as-cast ZL101 alloy in different modification processes.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in figures 1-4, the invention discloses a device for timely supplying metal elements in aluminum alloy low-pressure casting, wherein the low-pressure casting device comprises a pressure tank 1 with an opening and a workbench 3 covering the opening of the pressure tank 1, the workbench 3 and the pressure tank 1 form a closed chamber, a holding furnace 2 is arranged in the chamber, molten metal is filled in the holding furnace 2, a mold 4 is arranged on the workbench 3, a cavity 400 is arranged on the mold 4, a liquid lifting pipe 5 for filling the molten metal into the cavity 400 is arranged in the holding furnace 2, the top end of the liquid lifting pipe 5 passes through the workbench 3 and is communicated with the cavity 400, the bottom end of the liquid lifting pipe 5 extends into the bottom of the holding furnace 2, an air inlet pipe 7 for introducing compressed air into the cavity is arranged on the side wall of the pressure tank 1, and the air inlet pipe 7 can be connected with an air compressor, in the specific embodiment of the invention, the device for timely supplying metal elements comprises a frame 12 and a motor fixed on the frame 12, wherein a rotating shaft 13 is installed on a motor shaft of the motor, an unwinding disc 14 for winding wires is detachably sleeved in the middle of the rotating shaft 13, and the unwinding disc 14 is fixed on the rotating shaft 13 through a fastener; a wire material 100 is wound on the unwinding disc 14, and the wire material is Mg-Sr with the diameter of 3-5 mm; the motor is a servo motor.
By adopting the technical scheme, in the heat preservation process, the alloying element Mg and the modifier Sr are added in time by the metal element supplying device and are introduced into the heat preservation furnace, so that the defect of element recession in the aluminum alloy can be effectively made up, the microalloying element and the modifier can obtain excellent modification and strengthening effects again in heat preservation, the mechanical property and hardness value of the alloy are improved, and the product performance stability is ensured. The device has improved cast production efficiency moreover, simple structure, operation stability.
In the specific embodiment of the invention, the side wall of the pressure tank 1 is further provided with a feeding pipe 6 for feeding materials into the holding furnace 2, and further comprises an actuating mechanism for controlling the on-off of the feeding pipe 6, the actuating mechanism comprises a cylinder 9, a cover body for on-off of the feeding pipe 6, a swing rod 8 and a base plate 11, a shell of the cylinder 9 is hinged with the outer wall of the pressure tank 1 through a hinge seat 10, a cylinder 9 shaft of the cylinder 9 is connected with the swing rod 8 through a sliding assembly, one end of the swing rod 8 is hinged with the base plate 11, and the other end of the swing rod 8, relative to the connecting end of the swing rod 8 and the base plate 11, is fixedly connected with the cover body. The sliding assembly comprises a sliding rail fixed on the swinging rod 8 and a sliding block connected with the sliding rail in a sliding manner, and the sliding block is hinged with a cylinder 9 shaft of the cylinder 9.
By adopting the technical scheme, the structure is simple, and the realization is convenient.
In the specific embodiment of the present invention, the present invention further comprises a control module, the control module is composed of a central controller 200, an operation button 300, a start button 800 and a timer 400, the operation button 300, the start button 800 and the timer 400 are all connected with the central controller 200, and the motor 500 is connected with the central controller 200 through a relay 300; the cylinder 9 is connected with the central controller 200 through an electromagnetic valve 700.
By adopting the technical scheme, the automatic control of the device is realized, and the casting production efficiency is improved.
In a specific embodiment of the present invention, a sealing groove 150 is disposed on an end surface of the cover body 15 facing the feed pipe 6, a sealing column 151 extending into the feed pipe 6 is extended from a middle portion of a bottom of the sealing groove 150, the sealing column 151 and the cover body 15 are integrally formed, a sealing cavity into which a pipe wall of the feed pipe 6 is inserted is formed between an outer wall of the sealing column 151 and a groove wall of the sealing groove 150, the bottom of the sealing cavity is provided with the sealing groove 150, a sealing ring 16 is disposed in the sealing groove 150, the outer wall of the sealing ring 16 is abutted against the groove wall of the sealing groove 150, an abutting groove 61 abutting against the sealing ring 16 is disposed on an end surface of the feed pipe 6 facing the sealing groove 150, and the abutting groove 61 is disposed corresponding to; the diameter of the sealing column 151 gradually increases from the end far away from the sealing groove 150 to the end close to the sealing groove 150, and the outer wall of the sealing column 151 is abutted against the inner wall of the feed pipe 6. Wherein, the lid is made for high temperature resistant material, lists as: tungsten.
By adopting the above technical scheme, when the cover body covers the feed inlet of the feed pipe 6, since the diameter of the sealing column 151 gradually increases from the end far away from the sealing groove 150 to the end close to the sealing groove 150, and the outer wall of the sealing column 151 and the inner wall of the feed pipe 6 are abutted against each other, so that when the sealing column 151 on the sealing groove 150 is inserted into the feed pipe 6, realizes gradual tightness and primary sealing, and is combined with the sealing ring 16 arranged in the sealing groove 150, after the sealing ring 16 is extruded, the sealing ring has a reset force, so that the surface of the sealing ring 16 is tightly attached to the end surface of the feeding pipe 6 facing the sealing groove 150 and the inside of the sealing groove 150, secondary sealing is realized, finally, the sealing performance of the joint of the cover body and the feeding pipe 6 is improved, gas cannot escape from the joint of the cover body and the feeding pipe 6 when compressed gas is introduced into the pressure tank 1, thereby ensuring that the molten metal can be smoothly introduced into the cavity 400 of the mold 4 through the riser pipe 5.
In the present embodiment, the seal ring 16 includes a seal ring 16 body, which includes an inner ring and an outer ring, a plurality of semicircular second elastic lugs 162 are equidistantly arranged on the inner wall of the outer ring along the circumference, a plurality of semicircular first elastic protrusions 161 are equidistantly arranged along the circumference on the outer wall of the inner ring, the first elastic bumps 161 are disposed inside the second elastic bumps 162, a first elastic cavity 1610 is formed between two adjacent first elastic bumps 161 and a corresponding second elastic bump 162, a second elastic cavity 1620 is formed between two adjacent second elastic bumps 162 and a corresponding first elastic bump 161, the front end of each second elastic bump 160 is abutted against the first elastic cavity 1610, the first elastic projection 161 on the sealing ring body and the second elastic projection 162 on the sealing ring body are arranged in a staggered manner. Wherein, the sealing ring is made of polytetrafluoroethylene material.
Through adopting above-mentioned technical scheme, improved the power that resets when sealing washer 16 receives the extrusion, and then improved the leakproofness of the junction of lid and inlet pipe 6.
The technical scheme of the invention is realized as follows: a method for supplying metal elements in time for aluminum alloy low-pressure casting is characterized in that: the method comprises the following steps:
1) pressing an operation key to start timing by a timer;
2) meanwhile, the central processing unit drives the electromagnetic valve, the electromagnetic valve drives the air cylinder 9, and the air cylinder 9 is ejected out of the shaft to open the cover body at the moment;
3) then, a start button is pressed, the central processing unit drives a relay, the relay drives a motor to operate, so that the unwinding disc 14 rotates, and at the moment, the wires 100 on the unwinding disc 14 are continuously fed into the holding furnace 2 through the feeding pipe 6; when the wires are fed into the feeding pipe, the wires are manually inserted into the feeding pipe, and then semi-automatic feeding into the heat preservation furnace is realized through the operation of the motor;
4) after the timer times for a period of time (the timing time is set according to the actual situation), the motor is suspended from running, and the feeding into the holding furnace 2 is stopped;
5) then, the central processing unit drives the electromagnetic valve again, the electromagnetic valve drives the cylinder 9, and at the moment, the cylinder 9 is axially recycled, so that the cover body seals the feeding pipe 6;
6) finally, compressed gas is introduced into the pressure tank 1, and at the moment, the molten metal in the holding furnace 2 is introduced into the cavity 400 on the mold 4 through the riser pipe 5, so that casting is realized.
The invention is further configured to: the wire 100 is fed into a holding furnace 2 at a speed of 1 cm/h.
The invention has the following beneficial effects: the device for supplying metal elements in time is utilized to realize semi-automatic feeding and casting of the aluminum alloy low-pressure casting device, so that the production efficiency is improved.
Specific data
FIG. 5 is an as-cast microstructure of different metamorphic processes. As can be seen from the figure, when the incubation time was 10min and the crystal was not added midway, the eutectic structure was in the form of floc and the α -Al was regularly arranged. When the holding time was 3 hours and the addition was not performed, the eutectic structure was changed into fine needles before the deterioration, and the phase size was significantly increased. In comparison with the component detection in FIG. 8, it was found that the Sr element and Mg element contents were 0.0203% and 0.4513%, respectively, when the incubation time was 10min and the element was not added halfway, the effect of significantly modifying the eutectic structure was exhibited. The Sr element can not be detected in the experimental group which is not added midway during the heat preservation for 3 hours, and the content of the Mg element is also reduced to 0.1689 percent. Leading to deterioration of the deterioration effect. Therefore, the modification effect of Sr gradually declines with the increase of the holding time, and the size of eutectic silicon also grows with the increase of the holding time. In the test group which is continuously added in the middle of 3h of heat preservation, the contents of Sr element and Mg element are increased to 0.0216 percent and 0.4548 percent. The eutectic structure in the metallographic structure is degenerated again, and the eutectic structure is flocculent, and the alpha-Al is regularly arranged and has smaller size. FIG. 5 shows the as-cast microstructure of ZL101 alloy under different modification processes, (a) heat preservation is carried out for 10min and no intermediate addition is carried out; (b) preserving the heat for 3 hours without adding in the midway; (c) keeping the temperature for 3 hours and continuously adding the mixture.
Fig. 6 is a microstructure of T6 heat treated for different metamorphic processes. As can be seen from FIG. 5, the eutectic silicon in the form of original flocks or needles was changed into grains or short rods after the T6 heat treatment of the as-cast aluminum alloy. As can be seen from the figure 4, the eutectic silicon phase in the test group is not added midway for 10min, the eutectic silicon phase is changed from a flocculent state in a casting state to a granular state with fine spheroidization after heat treatment, and the processes of dissolution and spheroidization of the eutectic silicon are realized, so that the stress concentration effect on the matrix during cutting and bearing is reduced, and the strength of the alloy is improved; the eutectic silicon phase in the alloy after heat treatment of the heat preservation for 3 hours without adding the test group midway is in a short rod shape, and the size of the phase is larger than that of the phase without adding the test group midway in 10 minutes. And when the eutectic silicon phase is continuously added into the alloy after the heat treatment of the test group in the heat preservation process for 3 hours, the eutectic silicon phase has a fine granular appearance again and is distributed uniformly, so that the eutectic silicon phase plays a great role in improving the mechanical property of the alloy and ensuring the stability of the product performance. FIG. 6 shows the microstructure of ZL101 alloy after heat treatment under different modification processes, (a) the alloy is kept warm for 10min and is not added midway; (b) preserving the heat for 3 hours without adding in the midway; (c) keeping the temperature for 3 hours and continuously adding the mixture.
FIG. 7 is the mechanical property data of ZL101 alloys before and after heat treatment under different metamorphic processes. As is evident from the figure, the mechanical properties of the as-cast alloy are inferior to those of the post-heat treatment. Wherein the tensile strength of the alloy in the test group is 239.7MPa, the yield strength is 186.4MPa and the elongation is 3.4% after the heat preservation is carried out for 10 min. After heat treatment of a test group is not added midway for 3 hours, the mechanical property of the alloy is obviously reduced, the tensile strength is 201.5MPa, the yield strength is 170.6MPa, and the elongation is 1.1%. And after the heat treatment of the test group is continuously added in the heat preservation for 3 hours, the tensile strength of the alloy is 243.5MPa, the yield strength is 185.9MPa, the elongation is 3.6%, the mechanical property is improved to the initial stage (when the heat preservation is carried out for 10 minutes), and the performance stability of the electric power fitting product is ensured. After T6 heat treatment, the mechanical properties of ZL101 alloy under three modification processes are greatly improved. Wherein the tensile strength of the alloy in the test group is 321.6MPa, the yield strength is 270.9MPa and the elongation is 8.4% after the heat preservation is carried out for 10 min. The tensile strength of the alloy after heat treatment of the test group is maintained for 3 hours and is 288.9MPa, the yield strength is 223.7MPa, and the elongation is 4.8%. The tensile strength of the alloy after heat treatment by continuously adding the test group in the heat preservation for 3 hours is 330.4MPa, the yield strength is 281.6MPa, the elongation is 8.1%, the strength value in the mechanical property is improved to the initial stage (when the heat preservation is carried out for 10 minutes), and the elongation even exceeds the test group in the initial stage, which shows that continuously adding Sr and Mg in the midway has good deterioration and strengthening effects on electric power fittings. FIG. 7 mechanical properties of ZL101 alloy under different modification processes before and after heat treatment.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. The utility model provides an aluminum alloy low pressure casting in time supply metallic element device which characterized in that: the wire winding machine comprises a rack and a motor fixed on the rack, wherein a rotating shaft is mounted on a motor shaft of the motor, an unwinding disc for winding wires is detachably sleeved in the middle of the rotating shaft, and the unwinding disc is fixed on the rotating shaft through a fastener; the low-pressure casting device is characterized by further comprising an actuating mechanism, wherein the actuating mechanism comprises an air cylinder, a cover body, a swinging rod and a base plate, the shell of the air cylinder can be hinged with the outer wall of a pressure tank of the low-pressure casting device through a hinge seat, an air cylinder shaft of the air cylinder is connected with the swinging rod through a sliding assembly, one end of the swinging rod is hinged with the base plate, and the other end, opposite to the connecting end of the swinging rod and the base plate, of the swinging rod is fixedly connected with the cover body; the motor is characterized by also comprising a control module, wherein the control module consists of a central controller, an operation button, a starting button and a timer, the operation button, the starting button and the timer are all connected with the central controller, and the motor is connected with the central controller through a relay; the cylinder is connected with the central controller through an electromagnetic valve; the sealing cover is characterized in that a sealing groove is formed in the cover body, a sealing column extends from the middle of the bottom of the sealing groove, a sealing cavity is formed between the outer wall of the sealing column and the wall of the sealing groove, the bottom of the sealing cavity is provided with the sealing groove, a sealing ring is arranged in the sealing groove, and the outer wall of the sealing ring is abutted against the wall of the sealing groove; the diameter of the sealing column is gradually increased from one end far away from the sealing groove to one end close to the sealing groove, and the outer wall of the sealing column is abutted against the inner wall of the feeding pipe; the sliding assembly comprises a sliding rail fixed on the swing rod and a sliding block connected with the sliding rail in a sliding mode, and the sliding block is hinged with a cylinder shaft of the cylinder.
2. The device for timely supplying metal elements in the low-pressure casting of the aluminum alloy according to claim 1, wherein: the sealing washer include the sealing washer body, the sealing washer body includes inner circle and outer lane, be provided with a plurality of semicircular second elastic lug along the circumference equidistance on the inner wall of outer lane, be provided with a plurality of semicircular first elastic lug along the circumference equidistance on the outer wall of inner circle, first elastic lug establishes at second elastic lug inboardly, forms first elasticity chamber between two adjacent first elastic lug and a second elastic lug that corresponds, forms second elasticity chamber between two adjacent second elastic lug and the first elastic lug that corresponds, each second elastic lug's front end all contradicts with first elasticity chamber, second elastic lug dislocation set on first elastic lug on the sealing washer body and the sealing washer body.
3. The device for timely supplying metal elements in the low-pressure casting of the aluminum alloy according to claim 1, wherein: the motor is a servo motor.
4. A method of supplying an apparatus for supplying a metal element in time for low pressure casting of an aluminum alloy according to any one of claims 1 to 3, comprising: the method comprises the following steps:
1) pressing an operation key to start timing by a timer;
2) meanwhile, the central processing unit drives the electromagnetic valve, the electromagnetic valve drives the air cylinder, and the air cylinder shaft is ejected out to open the cover body at the moment;
3) then, pressing a start button, driving a relay by the central processing unit, driving a motor to run by the relay to rotate the unwinding disc, and feeding wires on the unwinding disc into the low-pressure casting device continuously;
4) after the timer counts a period of time, the motor is suspended to operate, and feeding to a holding furnace of the low-pressure casting device is stopped;
5) then, the central processing unit drives the electromagnetic valve again, the electromagnetic valve drives the air cylinder, and at the moment, the air cylinder shaft is recovered, so that the cover body seals a feeding hole of the low-pressure casting device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910400428.8A CN110000361B (en) | 2019-05-15 | 2019-05-15 | Device and method for timely supplying metal elements for aluminum alloy low-pressure casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910400428.8A CN110000361B (en) | 2019-05-15 | 2019-05-15 | Device and method for timely supplying metal elements for aluminum alloy low-pressure casting |
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| CN207756860U (en) * | 2018-01-24 | 2018-08-24 | 东莞市宏锦金属制品有限公司 | Aluminium titanium boron wire feeds silk system |
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| JPH08257712A (en) * | 1995-03-20 | 1996-10-08 | Nippon Steel Corp | Method and device for feeding wire-additive in continuous casting |
| CN201848509U (en) * | 2010-10-18 | 2011-06-01 | 云南铝业股份有限公司 | Rod feeding device for grain refinement of aluminium alloy |
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| CN207756860U (en) * | 2018-01-24 | 2018-08-24 | 东莞市宏锦金属制品有限公司 | Aluminium titanium boron wire feeds silk system |
| CN208368250U (en) * | 2018-06-07 | 2019-01-11 | 扬州市金阳光电缆有限公司 | A kind of extraordinary direct current cables of measuring body rail traffic |
| CN208745080U (en) * | 2018-07-17 | 2019-04-16 | 江西龙晨科技有限公司 | A kind of processing PVC plate mixing raw materials machine |
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