A method of producing a two-split spacer frame

Abstract

The application relates to a production method of a two-split spacer frame, which is made of aluminum alloy, and the specific components (in percentage by weight) are as follows: Si: 10-13, Fe: 0.5-2.0, Cu: 1.0-2.5, Mg: 0.2-0.4, Mn: 0.05-0.1, Ti: 0.01-0.03, Ni: 0.01-0.02, Ba: 0.005-0.01, Cr: 0.01-0.1, B<=0.001, P<=0.001, S<=0.001; hard phase: 0.001-0.005; and the rest is Al; the production steps of the two-split spacer frame include aluminum liquid smelting, metal mold preparation, high-pressure die casting, mold opening, cleaning and heat treatment; through reasonable design of aluminum alloy components of the two-split spacer frame, high-pressure die casting forming and stress relief annealing process are adopted, the produced two-split spacer frame has the characteristics of compact structure, high yield, compact structure and high tensile strength.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of aluminum alloy electric power fitting preparation, and particularly relates to a production method of a two-split spacer frame. BACKGROUND

[0002] The water power and energy in China are mainly distributed in the central and western parts, and need to be transported over a long distance after being converted into electric energy. The electric energy is often transported through a power transmission line at high or extra-high voltage, and the power transmission line usually adopts two or more parallel wires. In order to meet the requirement of electric power transmission, the diameter of the wire is large, and in order to reduce the cost, the support point span between adjacent wires is large. Under the action of external force in the environment, the wire drops or swings, the wires close to each other even touch each other to cause short circuit, and the safe operation of the power transmission line is reduced. In order to keep the distance between the parallel wires in the power transmission line stable, a two-split spacer is usually used for fixation. The two-split spacer is used for relative fixation between two parallel wires.

[0003] There are many types of two-split spacers, but the structures are similar. For example, the Chinese invention patent application (201611004547.4) discloses a pre-hinged two-split spacer. The pre-hinged two-split spacer comprises a frame, two wire clamp arms and two wire clamp plates. The middle parts of the two wire clamp arms are respectively connected with the two arms of the frame through pivots. The ends of the two wire clamp arms are provided with stop blocks. The two arms of the frame are provided with limiting grooves for placing the stop blocks. The upper end of the wire clamp plate is connected with the end of the wire clamp arm through a pin shaft. The other end of the wire clamp plate is clamped through a lock rod installed on the wire clamp arm. The wire clamp arm and the wire clamp plate are respectively provided with damping pads in the semicircular arcs. The relative fixation between the two parallel wires is realized. The frame is a component of the two-split spacer. The two-split spacer frame is currently made by sand casting or directly processed from a plate. The frame made by sand casting has low cost, but the organization is loose and not dense, the tensile strength is low, and the yield is low. The frame directly processed from a plate has dense organization, but the production cost is high, and the processing process is complex. SUMMARY

[0004] In order to obtain a frame with dense organization, high yield, dense organization and high tensile strength, the application provides a production method of a two-split spacer frame. In order to achieve the above purpose, the technical scheme adopted by the application is as follows:

[0005] The application relates to a production method of a two-split spacer frame, and the material of the two-split spacer frame is an aluminum alloy, and the specific components (in percentage by weight) are as follows: Si: 10-13, Fe: 0.5-2.0, Cu: 1.0-2.5, Mg: 0.2-0.4, Mn: 0.05-0.1, Ti: 0.01-0.03, Ni: 0.01-0.02, Ba: 0.005-0.01, Cr: 0.01-0.1, B<=0.001, P<=0.001, S<=0.001; the hard phase is 0.001-0.005; and the rest is Al; and the production steps of the two-split spacer frame are as follows.

[0006] Step S1: smelting; raw material aluminum ingots are added into a reverberatory furnace or an electric resistance furnace for heating and melting, according to the components of the aluminum ingots, small materials are added into the aluminum liquid so that the components of the aluminum liquid are within the following ranges, Si: 10-13, Fe: 0.5-2.0, Cu: 1.0-2.5, Mg: 0.2-0.4, Mn: 0.05-0.1, Ti: 0.01-0.03, Ni: 0.01-0.02, Ba: 0.005-0.01, Cr: 0.01-0.1, B<=0.001, P<=0.001, S<=0.001; refining, the aluminum liquid is discharged, and aluminum titanium alloy and aluminum barium alloy are added during the discharging process so that the titanium and barium contents in the aluminum liquid after discharging are within the following ranges, Ti: 0.01-0.03, Ba: 0.005-0.01; and the aluminum titanium alloy and the aluminum barium alloy are added into a holding furnace for use.

[0007] Step S2: mold; the mold is a metal mold, the fixed mold and the movable mold of the metal mold surround to form a cavity of the two-split spacer frame and a pouring system; when the metal mold is closed, a demolding agent is sprayed on the inner surface of the metal mold; the hard phase is mixed in the demolding agent and is sprayed on the inner surface of the metal mold along with the demolding agent;

[0008] Step S3: high-pressure die casting; the aluminum liquid in the holding furnace is dug into a barrel chamber of a die casting machine, a shooting rod pushes the aluminum liquid at a low speed of 0.2M / s so that the aluminum liquid fills the barrel chamber, the shooting rod pushes the aluminum liquid into the pouring system and the cavity of the two-split spacer frame at a high speed of 1M / s, the pressure is increased to 55MPa-62MPa, the pressure maintaining time is 5S-20S, and the high-pressure die casting is completed;

[0009] Step S4: mold opening; after the high-pressure die casting is completed, the movable mold is opened, the two-split spacer frame and the pouring system are integrally pushed out under the action of a mold ejector rod, and the two-split spacer frame and the pouring system are taken away by a mechanical hand;

[0010] Step S5: cleaning; the pouring system is cut off, and burrs and flash of the two-split spacer frame are polished;

[0011] Step S6: heat treatment: stress relief annealing, the bisection spacer frame is placed in the heat treatment furnace, the heat treatment temperature is controlled at 195±5℃, the heat preservation time is 8~10h, and the furnace is cooled down.

[0012] The production method of the bisection spacer frame has the following advantages:

[0013] (1) The bisection spacer frame produced by the method has the characteristics of compact structure, high yield, compact structure and high tensile strength.

[0014] (2) The material of the bisection spacer frame is aluminum-silicon alloy, the Si content is set to 10~13, which is near the eutectic point of aluminum-silicon alloy, and the aluminum alloy has good fluidity, which is beneficial to high-pressure casting; iron is a harmful element in aluminum alloy, and the iron content in aluminum-silicon alloy is controlled at 0.5~2.0; high iron content is beneficial to reducing the production cost of the bisection spacer; in the aluminum alloy, Fe forms β-Fe or α-Al8Fe2Si second phase, but β-Fe phase presents fishbone shape, and α-AL8Fe2Si presents needle shape, which seriously cracks the matrix and reduces the tensile strength of the bisection spacer frame. Through multiple experiments, when the Fe content is within 0.5~2.0, 0.05~0.1Mn, 1.0~2.5Cu and 0.01~0.1Cr are added to the aluminum alloy, the ratio of Fe, Mn, Cu and Cr is reasonably set, Mn and Cu form a certain proportion of (FeMn)Al6, Al 64 Cu 24 Fe 12 second phase, thereby reducing or replacing the formation of β-Fe or α-AL8Fe2Si second phase, (FeMn)Al6, Al 64 Cu 24 Fe 12 present strip or sheet shape, which is beneficial to reducing the addition of Fe to crack the matrix; and is beneficial to improving the tensile strength. The addition of 0.01~0.1Cr replaces the position of Fe in Al 64 Cu 24 Fe 12 forms Al 64 Cu 24 Fe 10 Cr2, which improves the shape or size of Al 64 Cu 24 Fe 12 , further reduces the cracking of the matrix; and is beneficial to improving the tensile strength and hardness.

[0015] (3) Adding 0.01~0.03 Ti, 0.01~0.02 Ni and 0.005~0.01 Ba into the aluminum alloy, and adding a small amount of Ti, Ni and Ba, forming Al3Ti and AlNi compounds, hindering the growth of eutectic silicon grains during solidification process, achieving modification purpose, being conducive to refining the grains of eutectic silicon; improving the mechanical properties of the two-division spacer frame; Ba has strong modification ability and long effective time, and adding a small amount of Ba is conducive to improving the modification effect, further refining the grains of the aluminum alloy and further improving the mechanical properties. Adding aluminum-titanium alloy and aluminum-barium alloy when the molten aluminum is discharged is conducive to prolonging the modification effect. Controlling the elements of B, P and S to be below 0.001 to avoid combination with Ti, Ni and Ba and reduce the modification effect.

[0016] (4) Using the molten aluminum filling process, adding 0.001~0.005 hard phase into the molten aluminum, the hard phase has good heat resistance, roundness and particle size, using a metal mold, only spraying release agent on the surface of the metal mold, the molten aluminum solidifies quickly after filling, and the hard phase forms stable hard phase or hard point in the interior and surface layer of the two-division spacer frame, further improving the tensile strength of the two-division spacer frame.

[0017] (5) The mold is a metal mold with long service life and high casting size precision, the hard phase is mixed in the release agent to cut and facilitate demolding, and the molten aluminum filling and flushing make the hard phase roll into the molten aluminum to form dispersed hard phase in the two-division spacer frame.

[0018] (6) When the molten aluminum is scooped into the barrel chamber of the die casting machine with a spoon, the shot rod pushes the molten aluminum at a low speed of 0.2M / s to make the molten aluminum flow forward while filling the chamber formed by the barrel chamber and the shot rod; low-speed pushing makes the molten aluminum flow slowly to reduce air entrainment during the flow process; high-speed pushing of the molten aluminum at 1M / s makes the molten aluminum quickly fill the chamber of the two-division spacer frame and the pouring system, reduces the filling time, prevents the molten aluminum from solidifying due to heat dissipation, and cannot complete the filling; and the pressure is increased to 55MPa~62MPa, and the holding pressure time is 5S~20S, under the premise of allowing the locking force, the molten aluminum is solidified under a certain pressure, the pouring system has a feeding effect on the molten aluminum in the chamber of the two-division spacer frame, and the compactness of the two-division spacer frame structure is improved.

[0019] (7) The two-division spacer frame solidifies quickly in the metal mold, the heat treatment temperature is controlled at 195±5℃, the heat preservation time is 8~10h, and the furnace cooling is performed, so as to fully eliminate the internal stress of the two-division spacer frame, and the stability of the two-division spacer frame is improved.

[0020] Further, the hard phase is one of Al2O3, SiC, BN or a mixture of two or more thereof; the particle size of the hard phase is less than 1000 mesh; and the hard phase is mixed uniformly with the release agent when used.

[0021] Beneficial effects: Al2O3, SiC, BN respectively has good wettability with molten aluminum and stable combination with molten aluminum, and has the characteristics of high hardness and strong thermal stability, and is not easy to decompose during the solidification and heat treatment of the molten aluminum; the particle size is less than 1000 mesh, and the roundness is high, which is beneficial to the dispersion distribution of the hard phase in the molten aluminum and avoids the isolation of the tip from the matrix; the hard phase is mixed uniformly with the release agent when used; and it is beneficial to the uniform spraying of the hard phase.

[0022] Further, the release agent is an oil-based release agent, and the oil-based release agent mainly includes mineral oil: 25-40, graphite: 10-30, mica: 10-20, and talc powder: 30-40, and the particle size of the graphite, mica and talc powder is less than 1000 mesh; and the oil-based release agent is continuously stirred with the hard phase when used, so that the oil-based release agent is mixed uniformly with the hard phase.

[0023] Beneficial effects: The release agent is set to mineral oil: 25-40, graphite: 10-30, mica: 10-20 and talc powder: 30-40; it has good isolation effect and is well attached to the inner surface of the mold when sprayed; and the particle size is controlled to be less than 1000 mesh, which is beneficial to the uniform spraying of the release agent.

[0024] Further, the chamber formed by the mold includes two groups of two-split spacer rod frames, the two groups of two-split spacer rod frames are symmetrically arranged, the gating system is located below the two groups of two-split spacer rod frames, the gating system includes a handle, a first inner gate and a second inner gate, the first inner gate and the second inner gate are respectively used for the handle to communicate with the two groups of two-split spacer rod frames, and V-shaped grooves are respectively arranged on the back surfaces of the first inner gate and the second inner gate.

[0025] Beneficial effects: The metal mold is set to one mold with two pieces, which is beneficial to improve the production efficiency, the two groups of two-split spacer rod frames are symmetrically arranged, so that the filling and solidification conditions of the two pieces are the same, which is beneficial to improve the quality; the gating system is arranged below the two groups of two-split spacer rod frames to form a bottom casting, when the mold is filled, the molten aluminum is lifted, which is beneficial to the air exhaust in the chamber and reduces casting defects such as pores; the gating system only includes the handle, the first inner gate and the second inner gate, and the proportion of the gating system is small, which is beneficial to improve the yield; the V-shaped grooves are respectively arranged on the back surfaces of the first inner gate and the second inner gate; and the V-shaped grooves are cut off or sheared off, which reduces the collapse or cracking.

[0026] Further, overflow channels are arranged in two sets of the two-split spacer frame cavity of the mold respectively, the overflow channels include overflow packages and flow channels, two ends of the flow channels are connected with the two-split spacer frame and the overflow package respectively; V-shaped grooves are arranged on the flow channels.

[0027] Beneficial effects: the overflow channels are used to collect the aluminum liquid filled into the cavity first, the part of the aluminum liquid contains a large amount of slag, so that solidification in the two-split spacer frame cavity is avoided, and the quality of the two-split spacer frame is improved; the V-shaped grooves are opened, and the cutting or shearing is performed from the V-shaped grooves, so that the collapse or crack is reduced.

[0028] Further, the overflow channels include three groups, two groups are arranged on both sides of the end of the two-split spacer frame cavity away from the gating system; and the other group is arranged on the outside of the end of the two-split spacer frame cavity close to the gating system.

[0029] Beneficial effects: the three groups of overflow channels are arranged at the end of the filling, so that the collection effect of the aluminum liquid filled into the cavity first is improved.

[0030] Further, a vacuum valve is arranged on the movable mold of the mold, the vacuum valve is communicated with the two-split spacer frame cavity through the overflow channel; and the vacuum valve is used to vacuumize the two-split spacer frame cavity between the mold closing and the aluminum liquid filling.

[0031] Beneficial effects: by arranging the vacuum valve, the vacuum valve is used to vacuumize the two-split spacer frame cavity and the gating system when the mold is closed, and the vacuum degree in the two-split spacer frame cavity and the gating system is-80 kpa when the aluminum liquid is filled; the air is reduced or avoided to be rolled in during the aluminum liquid flowing, and the formation of the porosity casting defect is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is one of the gating system diagrams of example 1 of the production method of the two-split spacer frame of the application;

[0033] Figure 2 is the second gating system diagram of example 1 of the production method of the two-split spacer frame of the application;

[0034] Figure 3 is the aluminum liquid as-cast metallographic diagram of example 1 of the production method of the two-split spacer frame of the application.

[0035] In the figure: 1-two-split spacer frame, 2-gating system, 3-handle, 4-first inner gate, 5-second inner gate, 6-V-shaped groove, 7-overflow channel, 8-overflow package, 9-flow channel. DETAILED DESCRIPTION

[0036] The application will be described in further detail below in combination with the drawings and specific embodiments:

[0037] The specific steps of the embodiment 1 of the production method of the two-split spacer frame are as follows:

[0038] The two-split spacer frame 1 is made of aluminum alloy, and the specific components (in percentage by weight) are as follows: Si: 10-13, Fe: 0.5-2.0, Cu: 1.0-2.5, Mg: 0.2-0.4, Mn: 0.05-0.1, Ti: 0.01-0.03, Ni: 0.01-0.02, Ba: 0.005-0.01, Cr: 0.01-0.1, B≤0.001, P≤0.001, S≤0.001; hard phase: 0.001-0.005; and the rest is Al; and the sum of other impurity elements is ≤0.002.

[0039] In this embodiment, the hard phase is a mixture of Al2O3 and SiC, and the ratio of Al2O3 to SiC is 2:3; the particle size of the mixture of Al2O3 and SiC is less than 1000 mesh. Al2O3 powder has low cost, good wettability with aluminum liquid, stable combination with aluminum liquid, high hardness, and strong thermal stability, and is not easy to decompose during the solidification and heat treatment of the aluminum liquid; the particle size of less than 1000 mesh and high roundness are beneficial to the dispersion of the hard phase in the aluminum liquid and the avoidance of the sharp tip from isolating the matrix. In other embodiments, the hard phase is one of Al2O3, SiC, and BN; or a mixture of Al2O3 and BN or a mixture of SiC and BN, or a mixture of Al2O3, SiC, and BN, instead of the mixture of Al2O3 and SiC; wherein, when the mixture of Al2O3 and BN or the mixture of SiC and BN or the mixture of Al2O3, SiC, and BN is used, the component ratio of the mixture is reasonably set in terms of cost and effect.

[0040] The production steps of the two-split spacer frame 1 are as follows:

[0041] Step S1: smelting; the raw material aluminum ingot is added into a reverberatory furnace or an electric resistance furnace for heating and melting; according to the components of the aluminum ingot, small materials (mainly including aluminum-silicon, aluminum-magnesium, aluminum-copper, pure nickel, aluminum-chromium, and aluminum-manganese alloy) are added into the aluminum liquid for refining; the composition of the aluminum liquid is detected before the furnace, so that the composition of the aluminum liquid is within the following range: Si: 10-13, Fe: 0.5-2.0, Cu: 1.0-2.5, Mg: 0.2-0.4, Mn: 0.05-0.1, Ni: 0.01-0.02, Cr: 0.01-0.1, B≤0.001, P≤0.001, and S≤0.001; after the composition is qualified, the aluminum liquid is discharged from the furnace, and aluminum-titanium alloy and aluminum-barium alloy are added during the discharging process, so that the content of titanium and barium in the aluminum liquid after discharging meets the following range: Ti: 0.01-0.03, and Ba: 0.005-0.01.

[0042] After argon blowing refining of the molten aluminum, the composition is detected again, and the composition is specifically: Si: 11.22, Fe: 1.85, Cu: 2.23, Mg: 0.35, Mn: 0.08, Ti: 0.025, Ni: 0.017, Ba: 0.008, Cr: 0.079, B: 0.0008, P: 0.0005, S: 0.0006; after the composition is qualified, the temperature of the molten aluminum is controlled at 690-700°C, and the molten aluminum is added into the holding furnace through the transfer ladle for use, and the temperature of the molten aluminum in the holding furnace is controlled at 675±10°C.

[0043] Step S2: mold; the mold is a metal mold, and the fixed mold and the movable mold of the metal mold enclose a cavity of the two-split interval rod frame 1 and a pouring system 2; when the metal mold is closed, a release agent is sprayed on the inner surface of the metal mold; the hard phase is mixed in the release agent and sprayed on the inner surface of the metal mold along with the release agent.

[0044] In this embodiment, the release agent is an oily release agent, and the oily release agent mainly includes mineral oil: 25-40, graphite: 10-30, mica: 10-20, and talcum powder: 30-40, the particle size of the graphite, mica and talcum powder is less than 1000 mesh; during use, the oily release agent is continuously stirred with the hard phase to uniformly mix the oily release agent with the hard phase. The release agent has good isolation effect and is well attached to the inner surface of the mold when sprayed; the particle size is controlled to be less than 1000 mesh, which is beneficial to uniform spraying of the release agent. The specific composition of the oily release agent is mineral oil: 30, graphite: 20, mica: 15 and talcum powder: 35. In other embodiments, the specific composition of the oily release agent is mineral oil: 25, graphite: 30, mica: 10 and talcum powder: 35; or mineral oil: 40, graphite: 10, mica: 10 and talcum powder: 40; instead of mineral oil: 30, graphite: 20, mica: 15 and talcum powder: 35.

[0045] During use, the release agent and the hard phase are mixed according to the corresponding proportion in a stirring tank, and the stirring is not stopped when the release agent and the hard phase are sprayed on the inner surface of the metal mold, so that the uniformity is maintained.

[0046] Step S3: high-pressure die casting; the ladle keeps the aluminum liquid in the furnace and digs into the barrel chamber of the die casting machine, the ram pushes the aluminum liquid at a low speed of 0.2M / s, the aluminum liquid fills the barrel chamber, and the ram pushes the aluminum liquid at a high speed of 1M / s to press into the cavity of the pouring system 2 and the two-split spacer bar frame 1; when the aluminum liquid is dug into the barrel chamber of the die casting machine by the ladle, the ram pushes the aluminum liquid at a low speed of 0.2M / s, and the aluminum liquid flows forward while filling the cavity formed by the barrel chamber and the ram; the low-speed pushing makes the aluminum liquid flow slowly, reducing the air entrainment during the flow of the aluminum liquid; the high-speed pushing of the aluminum liquid at 1M / s makes the aluminum liquid quickly fill the cavity of the two-split spacer bar frame 1 and the pouring system 2, reducing the mold filling time and preventing the aluminum liquid from solidifying due to heat dissipation, which cannot complete the mold filling. After the mold filling is completed, the pressure is increased to 55MPa~62MPa, and the holding pressure time is 5S~20S, and the high-pressure die casting is completed; under the premise of allowing the locking force, the aluminum liquid is solidified at a certain pressure, so that the pouring system 2 has a feeding effect on the aluminum liquid in the cavity of the two-split spacer bar frame 1, and the compactness of the two-split spacer bar frame 1 is improved. In this embodiment, the pressure is increased to 60MPa; the holding pressure time is 10S. In other embodiments, the pressure is increased to 62MPa, the holding pressure time is 5S, or the pressure is increased to 55MPa, the holding pressure time is 20S, etc.

[0047] In this embodiment, as shown in Figure 1 and Figure 2 , the cavity formed by the mold includes two groups of two-split spacer bar frames 1, the two groups of two-split spacer bar frames 1 are symmetrically arranged, the pouring system 2 is located below the two groups of two-split spacer bar frames 1, the pouring system 2 includes a handle 3, a first sprue 4 and a second sprue 5, the first sprue 4 and the second sprue 5 are respectively used for the handle 3 to communicate with the two groups of two-split spacer bar frames 1; V-shaped grooves 6 are respectively arranged on the back surfaces of the first sprue 4 and the second sprue 5. The metal mold is set to one mold with two pieces, which is beneficial to improve the production efficiency, the two groups of two-split spacer bar frames 1 are symmetrically arranged, so that the mold filling and solidification conditions of the two pieces are the same, which is beneficial to improve the quality; the pouring system 2 is arranged below the two groups of two-split spacer bar frames 1 to form a bottom casting, when the mold is filled, the aluminum liquid is lifted, which is beneficial to the air exhaust in the cavity and reduces casting defects such as pores; the pouring system 2 only includes the handle 3, the first sprue 4 and the second sprue 5, and the pouring system 2 occupies a small proportion, which is beneficial to improve the yield; the V-shaped grooves 6 are respectively arranged on the back surfaces of the first sprue 4 and the second sprue 5; when cutting or shearing, the cutting or shearing is performed from the V-shaped grooves 6, which reduces the collapse or cracking. In other embodiments, under the premise of not considering the cost, the cavity formed by the mold is set to one group of split spacer bar frame, and the pouring system is arranged below the cavity of the split spacer bar frame.

[0048] In the embodiment, the overflow groove 7 is arranged in the two sets of two-split spacer frame 1 chambers of the mold respectively, the overflow groove 7 comprises an overflow package 8 and a flow channel 9, two ends of the flow channel 9 are connected with the two-split spacer frame 1 and the overflow package 8 respectively; the V-shaped groove 6 is arranged on the flow channel 9; the overflow groove 7 is used for collecting the aluminum liquid filled into the cavity first, the part of the aluminum liquid contains a large amount of gas slag, and the solidification in the two-split spacer frame 1 chamber is avoided, and the quality of the two-split spacer frame 1 is improved; the V-shaped groove 6 is opened, and the cutting or shearing is performed from the V-shaped groove 6, so that the collapse or crack is reduced.

[0049] The overflow groove 7 comprises three groups, two groups are arranged on the two sides of the end of the two-split spacer frame 1 chamber away from the gating system 2; and the other group is arranged on the outside of the end of the two-split spacer frame 1 chamber close to the gating system 2. In other embodiments, more than four overflow grooves can be arranged under the condition that the yield is not considered, and are distributed around the two-split spacer frame chamber.

[0050] In the embodiment, the vacuum valve is arranged on the movable mold of the mold, the vacuum valve is communicated with the two-split spacer frame 1 chamber through the overflow groove 7; the vacuum valve is used for vacuumizing the two-split spacer frame 1 chamber between the mold closing and the aluminum liquid filling; through the arrangement of the vacuum valve, the vacuum valve is used for vacuumizing the two-split spacer frame 1 chamber and the gating system 2 when the mold is closed, and the vacuum degree in the two-split spacer frame 1 chamber and the gating system 2 is-80 kpa when the aluminum liquid is filled; the air entrained in the aluminum liquid flowing process is reduced or avoided, and the formation of the porosity casting defect is reduced. In other embodiments, the vacuum valve is not arranged on the movable mold of the mold under the condition that the porosity does not cause the two-split spacer frame to be scrapped.

[0051] Step S4: opening the mold; after the high-pressure die casting is completed, the movable mold is opened, the two-split spacer frame 1 and the gating system 2 are integrally ejected under the action of the mold ejector rod, and are taken away by the robot;

[0052] Step S5: cleaning: cutting off the gating system 2, and polishing burrs and flash of the two-split spacer frame 1;

[0053] Step S6: heat treatment: stress relief annealing, the two-split spacer frame 1 is placed in the heat treatment furnace, the heat treatment temperature is controlled to be 195±5℃, the heat preservation time is 8-10h, and the furnace cooling is performed, so that the internal stress of the two-split spacer frame 1 is fully eliminated, and the stability of the two-split spacer frame 1 is improved. In the embodiment, the heat treatment temperature is controlled to be 195℃, and the heat preservation time is 9h. In other embodiments, the heat treatment temperature is 200℃, the heat preservation time is 8h, or the heat treatment temperature is 190℃, the heat preservation time is 10h, instead of the heat treatment temperature being 195℃ and the heat preservation time being 9h.

[0054] Compared with the embodiment 1, the main difference of the embodiment 2 of the production method of the two-split spacer frame of the application lies in that in the step S2, after the argon blowing refining, the component is detected again, and the component is Si: 12.03, Fe: 1.94, Cu: 2.32, Mg: 0.38, Mn: 0.07, Ti: 0.026, Ni: 0.015, Ba: 0.007, Cr: 0.081, B: 0.0006, P: 0.0005, S: 0.0007; the component is qualified. After the argon blowing refining, the component is detected again, and the component has certain randomness, and can be used under the premise of meeting the component requirements of the two-split spacer frame.

[0055] The two-split spacer frame produced by the application has the characteristics of compact structure, high yield, compact structure and high tensile strength by reasonably designing the aluminum alloy component of the two-split spacer frame, using high-pressure die casting forming and stress relief annealing process. The as-cast metallographic photograph of the aluminum liquid used in the two-split spacer frame is shown in Figure 3 The metallographic level of the Al-Si eutectic and hypoeutectic alloy is 1, the point granular eutectic silicon is in the form of bone block and is uniformly distributed, the tensile strength σb (MPa) after heat treatment is: ≥370, and the two-split spacer frame can withstand a larger tensile working condition.

[0056] In the application, unless otherwise specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0057] The above is only the preferred embodiment of the application, and it should be pointed out that for ordinary skilled in the art, several improvements and replacements can be made without departing from the technical principles of the application, and these improvements and replacements should also be regarded as the protection scope of the application.

Claims

1. A method for producing a binary split spacer frame, characterized in that: The binary splitting spacer frame is made of aluminum alloy, and its specific composition, by weight percentage, is as follows: Si: 10-13, Fe: 1.85-2.0, Cu: 1.0-2.5, Mg: 0.2-0.4, Mn: 0.05-0.1, Ti: 0.01-0.03, Ni: 0.01-0.02, Ba: 0.005-0.01, Cr: 0.01-0.1, B≤0.001, P≤0.001, S≤0.001; hard phase: 0.001-0.005; the rest is Al; the hard phase is one or a mixture of two or more of Al2O3, SiC, and BN; the particle size of the hard phase is less than 1000 mesh; the production steps of the binary splitting spacer frame are as follows: Step S1: smelting; adding the raw aluminum ingot into a reverberatory furnace or a resistance furnace for heating and melting, adding small materials to the aluminum liquid according to the composition of the aluminum ingot, so that the composition of the aluminum liquid is within the following ranges: Si: 10-13, Fe: 1.85-2.0, Cu: 1.0-2.5, Mg: 0.2-0.4, Mn: 0.05-0.1, Ti: 0.01-0.03, Ni: 0.01-0.02, Ba: 0.005-0.01, Cr: 0.01-0.1, B≤0.001, P≤0.001, S≤0.001; refining, the aluminum liquid is discharged from the furnace, and aluminum-titanium alloy and aluminum-barium alloy are added during the discharge process to ensure that the titanium and barium contents in the aluminum liquid after discharge meet the following ranges: Ti: 0.01-0.03, Ba: 0.005-0.01; adding and holding in the furnace for use; Step S2: Mold; the mold is a metal mold, and the fixed mold and the movable mold of the metal mold enclose a cavity and a pouring system for the two-split spacer rod frame; when the metal mold is closed, a release agent is sprayed on the inner surface of the metal mold; the hard phase is mixed in the release agent and sprayed on the inner surface of the metal mold along with the release agent; the release agent is an oily release agent, and the oily release agent is composed of mineral oil: 25-40, graphite: 10-30, mica: 10-20 and talc: 30-40, and the particle size of the graphite, mica and talc is less than 1000 mesh; during use, the oily release agent and the hard phase are continuously stirred to ensure that the oily release agent and the hard phase are evenly mixed; Step S3: High-pressure die casting: A spoon is used to dig the aluminum liquid in the furnace into the barrel chamber of the die-casting machine. The shooting rod pushes the aluminum liquid at a low speed of 0.2m / s to fill the barrel chamber. The shooting rod presses the aluminum liquid into the cavity of the pouring system and the two-split spacer rod frame at a high speed of 1m / s. The pressure is increased to 55MPa~62MPa and the pressure is maintained for 5s~20s to complete the high-pressure die casting. Step S4: mold opening; after the high-pressure die casting is completed, the movable mold is opened, and the two-split spacer frame and the gating system are ejected as a whole under the action of the mold ejector and taken away by the robot; Step S5: Cleaning: cutting off the gating system and polishing the burrs and flash of the binary spacer frame; Step S6: Heat treatment: stress relief annealing, placing the binary splitting spacer rod frame in a heat treatment furnace, controlling the heat treatment temperature at 195±5°C, keeping the temperature for 8-10 hours, and cooling with the furnace.

2. The method for producing a binary split spacer frame according to claim 1, characterized in that: The cavity formed by the mold includes two groups of two-split spacer rod frames, which are symmetrically arranged. The pouring system is located below the two groups of two-split spacer rod frames. The pouring system includes a material handle, a first ingrowth and a second ingrowth. The first ingrowth and the second ingrowth are respectively used to connect the material handle with the two groups of two-split spacer rod frames; V-shaped grooves are respectively provided on the back of the first ingrowth and the second ingrowth.

3. The method for producing a binary split spacer frame according to claim 1, characterized in that: Overflow troughs are respectively provided in the two groups of binary split spacer bar frame cavities of the mold. The overflow troughs include an overflow bag and a flow channel. The two ends of the flow channel are respectively connected to the binary split spacer bar frame and the overflow bag; a V-shaped groove is provided on the flow channel.

4. The method for producing a binary split spacer frame according to claim 3, characterized in that: The overflow troughs include three groups, two of which are arranged on both sides of one end of the binary split spacer rod frame cavity away from the pouring system; and the other group is arranged on the outside of the one end of the binary split spacer rod frame cavity close to the pouring system.

5. The method for producing a binary split spacer frame according to claim 4, characterized in that: A vacuum valve is provided on the movable mold of the mold, and the vacuum valve is connected to the binary spacer frame chamber through an overflow groove; the vacuum valve evacuates the binary spacer frame chamber between mold closing and aluminum liquid filling.

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