CN110170621B - High-creep-rate high-strength hydraulic motor shell blank casting process - Google Patents
High-creep-rate high-strength hydraulic motor shell blank casting process Download PDFInfo
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- CN110170621B CN110170621B CN201910606698.4A CN201910606698A CN110170621B CN 110170621 B CN110170621 B CN 110170621B CN 201910606698 A CN201910606698 A CN 201910606698A CN 110170621 B CN110170621 B CN 110170621B
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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
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/10—Making spheroidal graphite cast-iron
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention belongs to the technical field of motor casting, and particularly relates to a high-creep-rate high-strength hydraulic motor shell blank casting process which comprises a creeping device, wherein the creeping device comprises a rotating rod, a rotating block, an isolating mechanism and a scattering mechanism; the rotating rod is arranged in the ladle, the lower end of the rotating rod is provided with an isolation mechanism, the upper end of the rotating rod is fixedly connected with a rotating block, and the middle part of the rotating rod is provided with a scattering mechanism; the rotating block is arranged on the upper side inside the ladle; the isolation mechanism comprises a mounting ring, a connecting rod, a moving block and a connecting block; the outer surface of the mounting ring is fixedly connected with a connecting rod; the method is mainly used for solving the problems that in the prior casting process, when a punching method is generally adopted to produce the vermicular cast iron, the molten iron and the vermiculizer are subjected to relative impact, so that the vermiculizer is not detonated at the bottom or is detonated too early, the absorption rate of the molten iron to the vermiculizer is further reduced, and the creep is poor, so that the tensile strength and the hardness of a hydraulic motor body shell are influenced.
Description
Technical Field
The invention belongs to the technical field of motor casting, and particularly relates to a high-creep-rate high-strength hydraulic motor shell blank casting process.
Background
The vermiculizer is an additive added into molten iron to obtain a vermicular graphite structure, and composite alloy vermiculizer containing a plurality of elements is widely used at present. The common alloy of rare earth-silicon-calcium, rare earth-magnesium-titanium, rare earth-magnesium and the like, the vermicular cast iron with excellent comprehensive performance can be obtained after the addition of the modifier exceeds a certain critical point, and can only be stabilized in a narrow range. This type of modificator is called a vermiculizer. The accurate selection of the vermiculizer and the mastery of the addition amount are the primary conditions for stable production of the vermicular cast iron, the addition amount of the vermiculizer is determined according to the factors of the chemical composition, the molten iron state, the cooling condition and the like, in the production of the vermicular cast iron, the poor vermiculization and the vermiculization recession are the common problems, the control quality of the poor vermiculization and the vermiculization recession directly influences the vermiculization effect of a casting, and the direct reason for the poor vermiculization is that the vermiculizer is not detonated at the bottom due to the impact generated when the molten iron is combined with the vermiculizer, the vermiculization rate is reduced, and the casting tensile strength and the casting hardness of a hydraulic motor shell are influenced.
Disclosure of Invention
In order to make up for the defects of the prior art, the invention provides a high-creep-rate high-strength hydraulic motor shell blank casting process. The method is mainly used for solving the problems that when the compacted graphite cast iron is produced by adopting an impact method in a casting process, the conventional compacted graphite cast iron can cause relative impact between molten iron and a vermiculizer, so that the vermiculizer is not detonated at the bottom, the absorption rate of the molten iron to the vermiculizer is reduced, and the casting tensile strength and hardness of a hydraulic motor body shell are influenced due to poor vermiculization.
The technical scheme adopted by the invention for solving the technical problems is as follows: the invention relates to a high-creep-rate high-strength hydraulic motor shell blank casting process, which comprises the following steps of:
s1: placing the prepared vermiculizer and inoculant into a ladle, placing the vermiculizer and the inoculant at the bottom of the ladle, placing the vermiculizer into the ladle, and covering and wrapping the vermiculizer and the inoculant by an isolation mechanism at the lower end of the vermiculizer;
s2: when the vermiculizer and the inoculant in the S1 are covered and wrapped by the isolation mechanism, the molten iron is introduced into the ladle through the upper end of the ladle, the molten iron is scattered to the bottom of the ladle through the scattering mechanism in the middle of the vermiculizing device, and the isolation mechanism is promoted to move upwards by utilizing the high temperature of the molten iron, so that the molten iron is combined with the vermiculizer and the inoculant; plant ash and scrap iron are placed in the scattering mechanism;
s3: when the molten iron in the S2 is combined with the vermiculizer and the inoculant, the isolation mechanism moves upwards, and plant ash and scrap iron in the scattering mechanism are introduced into the vermiculizer and the inoculant by the upward movement of the isolation mechanism, so that the incrustation property is improved;
s4: after the plant ash and the scrap iron in the S3 are combined with the vermiculizer and the inoculant, taking out the vermiculizer in the ladle, and pouring the molten iron after the vermiculization into a casting mold of a hydraulic motor shell prepared in advance for casting;
the vermicularizing devices used in the S1 and the S2 comprise rotating rods, rotating blocks, isolating mechanisms and scattering mechanisms; the rotating rod is arranged in the ladle, the lower end of the rotating rod is provided with an isolation mechanism, the upper end of the rotating rod is fixedly connected with a rotating block, and the middle part of the rotating rod is provided with a scattering mechanism; the rotating block is conical and is arranged on the upper side inside the ladle; the isolation mechanism comprises a mounting ring, a connecting rod, a moving block and a connecting block; the mounting ring is fixedly mounted on the outer surface of the lower end of the rotating rod, and the outer surface of the mounting ring is uniformly connected with connecting rods in a vertical sliding manner; the outer end of the connecting rod is slidably arranged in the moving block; the cross section of the moving block is L-shaped, the moving block is made of a high-strength light high-temperature-resistant composite material, a water cavity is formed in the lower end of the moving block, and the moving blocks are connected through a connecting block; the connecting block is made of soft metal and is arc-shaped; the water cavity is filled with water and communicated with an inner cavity at the upper end of the moving block; methane gas is filled in the cavity; the scattering mechanism comprises a bracket and a swinging plate; the support is in a cross shape, the outer surface of the inner end of the support is connected with a swing plate, and the inner end of the support is rotatably connected to the outer surface of the upper end of the rotating rod; the length of the upper end of the swinging plate is smaller than that of the lower end; when molten iron needs to be vermiculated, a vermiculizer and an inoculant can be put into a ladle, a vermiculation device is put into the ladle, the lower end of a rotating rod is fixedly connected with a connecting rod through a mounting ring, the outer end of the connecting rod is connected with moving blocks, the moving blocks are connected through the connecting blocks, when the vermiculation device is put into the ladle, the vermiculizer and the inoculant can be covered and wrapped by the moving blocks and the connecting blocks, when the molten iron is led into the ladle through the upper end of the ladle, the rotating blocks are fixedly connected with the upper end of the rotating rod and are conical, so when the molten iron enters the ladle, the molten iron can firstly contact with the rotating blocks and is uniformly dispersed to the lower end of the rotating blocks through the rotating blocks, and is uniformly dispersed to the lower end wall of the ladle through a swinging plate at the lower end of the rotating blocks and flows to the bottom of the ladle, when the molten iron is contacted with the moving blocks, the molten iron is evaporated, namely, water vapor is introduced into a cavity at the upper end of the moving block to contact with methane gas in the cavity and generate a chemical reaction to generate hydrogen, when the amount of the hydrogen reaches a certain degree, the moving block moves upwards under the dual action of the buoyancy of the hydrogen and the buoyancy of water, and in the process that the moving block moves upwards, the molten iron uniformly flows to the lower part of the moving block and contacts with a vermiculizer and an inoculant, so that the vermiculizer is detonated at the bottom of the molten iron, and the influence of the vermiculizer on the vermiculization efficiency due to the fact that the vermiculizer is not detonated at the bottom; when the moving block moves upwards, namely the hydrogen pressure of the cavity inside the moving block is increased, namely an extrusion force is generated at the outer end of the connecting rod, so that the moving block can slide towards the inner end along the connecting rod when moving upwards, and an extrusion force is generated on the connecting block, so that the connecting block is bent to form a larger arc surface, the stirring efficiency of the molten iron is further improved by matching with the stirring plate, the fusion of the molten iron and the vermiculizer is further improved, and meanwhile, the working efficiency of the swinging plate which is influenced by the contact of the moving block and the swinging plate when the moving block moves upwards to a certain height can be avoided when the moving block.
Guide plates are uniformly and fixedly arranged on the upper surface of the rotating block; the guide plate is obliquely arranged; the outer surface of the moving block is fixedly provided with a stirring plate; when the molten iron flows to the upper surface of the rotating block, because the upper surface of the rotating block is uniformly and fixedly provided with the guide plates which are arranged in an inclined way, so that the rotating block can rotate due to the existence of the guide plate when the molten iron impacts on the rotating block, so that the molten iron is dispersed more uniformly, and simultaneously drives the rotating rod to rotate, because the outer surface of the lower end of the rotating rod is fixedly provided with the mounting ring, the outer end of the mounting ring is connected with the moving block through the connecting rod, the moving blocks are connected through the connecting block, so that the rotating block can drive the moving block and the connecting block to rotate when rotating, and the stirring plate is fixedly arranged on the outer surface of the moving block, the stirring plate that can drive its surface when the movable block rotates promptly stirs the molten iron to make the molten iron spiral get into in the movable block when making the movable block move up, avoid the molten iron level to strike and make the vermiculation agent can't explode at the bottom on the vermiculation agent.
The outer surface of the lower end of the rotating rod is fixedly connected with a stirring block; the stirring block is conical; when the dwang was driven by the turning block, because of the lower extreme external surface fixedly connected with stirring piece of dwang, so can stir vermiculizer and inoculant through stirring the piece when the dwang rotates for vermiculizer and inoculant intensive mixing, and stir mixed molten iron when the molten iron is led in, make molten iron and vermiculizer intensive mixing, improve the efficiency of vermicularizing by a wide margin.
The scattering mechanism also comprises a rotating disc, a sliding cavity and a sliding rod; the outer end of the sliding rod is arranged on the inner surface of the lower end of the swinging plate in a contact mode, and the inner end of the sliding rod is connected in a sliding cavity in the rotating disc in a sliding mode; the rotating disc is fixedly arranged on the outer surface of the middle part of the rotating rod; the upper end of the swinging plate is hinged at the inner end of the bracket; when the dwang rotates, there is the rolling disc because of the middle part surface fixed mounting of dwang, sliding connection has the slide bar in the sliding chamber in the rolling disc, the outer end of slide bar and the lower extreme internal surface contact of swinging the board, so the dwang can drive the slide bar when rotating incessantly with swinging the interior surface intermittent type nature contact of board lower extreme, because of the upper end of swinging the board articulates the inner at the support, so the slide bar rotates can incessantly cause the lower extreme of swinging the board to be the arc reciprocating motion that makes a round trip, thereby further break up the molten iron, make the molten iron flow to the ladle lower extreme evenly.
The lower end of the sliding cavity is hinged with a rotating plate, the sliding cavity is filled with high-pressure gas, the lower end of the sliding cavity is filled with plant ash, and a mandril is arranged below the sliding cavity; the ejector rod is fixedly arranged on the upper surface of the inner end of the connecting rod; when the moving block receives the effect rebound of hydrogen, because of the articulated rotor plate that has of sliding chamber lower extreme, be full of high-pressure gas in the sliding chamber, the packing of sliding chamber lower extreme has the plant ash, the sliding chamber below is equipped with the ejector pin, ejector pin fixed mounting is at the inner end upper surface of connecting rod, so the moving block can drive the ejector pin when shifting up, and finally with the rotor plate contact, jack-up the rotor plate, lead to its inside plant ash and iron fillings to fall down along the breach department of rotor plate and contact with the vermicular agent under the effect of the expanding force of the inside high-pressure gas of sliding chamber simultaneously, in order to prevent the overflow of molten iron and atmosphere contact and magnesium vapour, can delay the reaction of vermicularizing, improve the effect of wriggling and breeding, make the crusting nature of molten iron improve.
The invention has the following beneficial effects:
1. the invention can realize that when molten iron needs to be vermiculated by arranging the isolation mechanism, the vermiculizer and the inoculant can be put into the ladle, the vermiculation device is put into the ladle, the lower end of the rotating rod is fixedly connected with the connecting rod through the mounting ring, the outer end of the connecting rod is connected with the moving blocks, and the moving blocks are connected through the connecting block, so when the vermiculation device is put into the ladle, the moving blocks and the connecting block can cover and wrap the vermiculizer and the inoculant, when the molten iron is led into the ladle through the upper end of the ladle, the rotating block is fixedly connected with the upper end of the rotating rod and is conical, so when the molten iron enters the ladle, the molten iron can firstly contact with the rotating block and is uniformly dispersed to the lower end of the rotating block through the rotating block, and is uniformly dispersed to the lower end wall of the ladle through the swinging plate at the lower end of the rotating block and flows to the, the high temperature of molten iron can heat the water in the inside water cavity of movable block, evaporate it promptly, vapor can let in the cavity of movable block upper end promptly and the methane gas contact in it and take place chemical reaction and produce hydrogen, can act on with the buoyancy of molten iron together when the volume of hydrogen reaches the certain degree, promote the movable block to shift up, even make the molten iron even flow to the movable block inside with the contact of vermiculizer and inoculant, make the vermiculizer explode in the molten iron bottom, avoid the vermiculizer not explode the influence efficiency of vermiculizing in the molten iron bottom, thereby make the motor body shell structural strength who is cast by the molten iron better.
2. The invention can realize that when molten iron flows to the upper surface of the rotating block, the guide plates are uniformly and fixedly arranged on the upper surface of the rotating block, and the guide plates are obliquely arranged, so when the molten iron impacts on the rotating block, the rotating block can rotate due to the existence of the guide plates, the molten iron is dispersed more uniformly, and simultaneously the rotating rod is driven to rotate, because the outer surface of the lower end of the rotating rod is fixedly provided with the mounting ring, the outer end of the mounting ring is connected with the moving block through the connecting rod, the moving blocks are connected through the connecting block, the rotating block can drive the moving block and the connecting block to rotate when rotating, and because the outer surface of the moving block is fixedly provided with the stirring plate, the stirring plate on the outer surface of the moving block can be driven to stir the molten iron when the moving block rotates, the molten iron can enter the moving block in a spiral manner when the moving block moves upwards, so that the combination of the molten iron and the vermiculizer cannot cause great influence on the hardness of a motor body shell cast by the molten iron.
3. According to the invention, the stirring block is arranged, so that when the rotating rod is driven by the rotating block, the stirring block is fixedly connected to the outer surface of the lower end of the rotating rod, a vermiculizer and an inoculant can be stirred by the stirring block when the rotating rod rotates, the vermiculizer and the inoculant are fully mixed, and the mixed molten iron is stirred when the molten iron is introduced, so that the molten iron and the vermiculizer are fully mixed, the vermiculization efficiency is greatly improved, and the tensile strength and the hardness of a body shell cast by the molten iron are greatly improved.
Drawings
FIG. 1 is a front view of the present invention;
FIG. 2 is a top view of the isolation mechanism of the present invention;
FIG. 3 is a top view of a turning block of the present invention;
FIG. 4 is an enlarged view of a portion of the invention at A in FIG. 1;
FIG. 5 is an enlarged view of a portion of the invention at B in FIG. 1;
FIG. 6 is a metallographic representation of a sample metallographic structure for experiments according to an embodiment of the invention;
in the figure: the device comprises a rotating rod 1, a stirring block 11, a rotating block 2, a guide plate 21, an isolation mechanism 3, a mounting ring 31, a connecting rod 32, a moving block 33, a stirring plate 331, a connecting block 34, a water cavity 35, a cavity 36, a scattering mechanism 4, a support 41, a swinging plate 42, a rotating disc 43, a sliding cavity 44, a sliding rod 45, a rotating plate 46 and an ejector rod 47.
Detailed Description
A casting process of a high creep rate and high strength hydraulic motor case blank according to an embodiment of the present invention will be described below with reference to fig. 1 to 5.
As shown in fig. 1-5, the high creep rate and high strength hydraulic motor housing blank casting process according to the present invention comprises the following steps:
s1: placing the prepared vermiculizer and inoculant into a ladle, placing the vermiculizer and the inoculant at the bottom of the ladle, placing the vermiculizer into the ladle, and covering and wrapping the vermiculizer and the inoculant by an isolation mechanism at the lower end of the vermiculizer;
s2: when the vermiculizer and the inoculant in the S1 are covered and wrapped by the isolation mechanism, the molten iron is introduced into the ladle through the upper end of the ladle, the molten iron is scattered to the bottom of the ladle through the scattering mechanism in the middle of the vermiculizing device, and the isolation mechanism is promoted to move upwards by utilizing the high temperature of the molten iron, so that the molten iron is combined with the vermiculizer and the inoculant; plant ash and scrap iron are placed in the scattering mechanism;
s3: when the molten iron in the S2 is combined with the vermiculizer and the inoculant, the isolation mechanism moves upwards, and plant ash and scrap iron in the scattering mechanism are introduced into the vermiculizer and the inoculant by the upward movement of the isolation mechanism, so that the incrustation property is improved;
s4: after the plant ash and the scrap iron in the S3 are combined with the vermiculizer and the inoculant, taking out the vermiculizer in the ladle, and pouring the molten iron after the vermiculization into a casting mold of a hydraulic motor shell prepared in advance for casting;
wherein the vermicularizing devices used in S1 and S2 comprise a rotating rod 1, a rotating block 2, an isolating mechanism 3 and a scattering mechanism 4; the rotating rod 1 is arranged in the ladle, the lower end of the rotating rod 1 is provided with an isolation mechanism 3, the upper end of the rotating rod 1 is fixedly connected with a rotating block 2, and the middle part of the rotating rod 1 is provided with a scattering mechanism 4; the rotating block 2 is conical, and the rotating block 2 is arranged on the upper side in the ladle; the isolation mechanism 3 comprises a mounting ring 31, a connecting rod 32, a moving block 33 and a connecting block 34; the mounting ring 31 is fixedly mounted on the outer surface of the lower end of the rotating rod 1, and the outer surface of the mounting ring 31 is uniformly connected with connecting rods 32 in a vertical sliding manner; the outer end of the connecting rod 32 is slidably mounted inside the moving block 33; the cross section of the moving block 33 is L-shaped, the moving block 33 is made of a high-strength, light and high-temperature-resistant composite material, a water cavity 35 is formed in the lower end of the moving block 33, and the moving blocks 33 are connected through a connecting block 34; the connecting block 34 is made of soft metal, and the connecting block 34 is arc-shaped; the water cavity 35 is filled with water, and the water cavity 35 is communicated with an inner cavity 36 at the upper end of the moving block 33; the cavity 36 is filled with methane gas; the scattering mechanism 4 comprises a bracket 41 and a swinging plate 42; the support 41 is in a cross shape, the outer surface of the inner end of the support 41 is connected with a swing plate 42, and the inner end of the support 41 is rotatably connected with the outer surface of the upper end of the rotating rod 1; the upper end of the swing plate 42 is shorter than the lower end; when molten iron needs to be vermiculated, a vermiculizer and an inoculant can be put into a ladle, a vermiculation device is put into the ladle, the lower end of a rotating rod 1 is fixedly connected with a connecting rod 32 through a mounting ring 31, the outer end of the connecting rod 32 is connected with a moving block 33, the moving blocks 33 are connected through a connecting block 34, when the vermiculation device is put into the ladle, the vermiculizer and the inoculant can be covered and wrapped by the moving block 33 and the connecting block 34, when the molten iron is led into the ladle through the upper end of the ladle, the rotating block 2 is fixedly connected with the upper end of the rotating rod 1, the rotating block 2 is conical, so the molten iron can firstly contact with the rotating block 2 and be uniformly dispersed to the lower end of the rotating block 2 through the rotating block, and be uniformly dispersed to the lower end wall of the ladle through a swinging plate 42 at the lower end to flow to the bottom of the ladle, when the molten iron is contacted, the water in the water cavity 35 inside the moving block 33 is heated by the high temperature of the molten iron, namely, the water is evaporated, namely, steam is introduced into the cavity 36 at the upper end of the moving block 33 to contact with methane gas in the cavity and generate a chemical reaction to generate hydrogen, when the amount of the hydrogen reaches a certain degree, the moving block 33 moves upwards under the dual effects of the buoyancy of the hydrogen and the buoyancy of the water, and in the upward movement process of the moving block 33, the molten iron uniformly flows to the lower part of the moving block 33 and contacts with a vermiculizer and a inoculant, so that the vermiculizer is detonated at the bottom of the molten iron, and the influence on the vermiculization efficiency caused by the fact that the vermiculizer is not detonated; when the moving block 33 moves upwards, namely the hydrogen pressure of the cavity 36 inside the moving block 33 is increased, namely, an extrusion force is generated at the outer end of the connecting rod 32, so that the moving block 33 can slide towards the inner end along the connecting rod 32 when moving upwards, and an extrusion force is generated at the connecting block 34, so that the connecting block 34 is bent to form a larger arc surface, and the stirring efficiency of molten iron is further improved by matching with the stirring plate 331, so that the fusion of the molten iron and the vermiculizer is further improved, and meanwhile, when the moving block 33 contracts inwards and slides, the contact of the moving block 33 and the swinging plate 42 when the moving block 33 rises to a certain height can be avoided to influence the working efficiency of.
The upper surface of the rotating block 2 is uniformly and fixedly provided with guide plates 21; the guide plate 21 is obliquely arranged; an agitating plate 331 is fixedly arranged on the outer surface of the moving block 33; when molten iron flows to the upper surface of the rotating block 2, the guide plates 21 are uniformly and fixedly installed on the upper surface of the rotating block 2, and the guide plates 21 are obliquely arranged, so that when the molten iron impacts on the rotating block 2, the rotating block 2 rotates due to the existence of the guide plates 21, the molten iron is dispersed more uniformly, and simultaneously the rotating block 1 is driven to rotate, because the outer surface of the lower end of the rotating block 1 is fixedly provided with the installation ring 31, the outer end of the installation ring 31 is connected with the moving block 33 through the connecting rod 32, and the moving blocks 33 are connected through the connecting block 34, so that the rotating block 2 drives the moving block 33 and the connecting block 34 to rotate when rotating, and because the outer surface of the moving block 33 is fixedly provided with the stirring plate 331, namely the stirring plate 331 on the outer surface of the moving block 33 is driven to stir the molten iron when the moving block, the phenomenon that the molten iron horizontally impacts the vermiculizer to cause the vermiculizer not to detonate at the bottom is avoided.
The outer surface of the lower end of the rotating rod 1 is fixedly connected with a stirring block 11; the stirring block 11 is conical; when dwang 1 is driven by turning block 2, because of the lower extreme external surface fixedly connected with stirring piece 11 of dwang 1, so can stir vermiculizer and inoculant through stirring piece 11 when dwang 1 rotates for vermiculizer and inoculant intensive mixing stir the molten iron that mixes when the molten iron leads to, make molten iron and vermiculizer intensive mixing, improve the efficiency of vermicularizing by a wide margin.
The scattering mechanism 4 further comprises a rotating disc 43, a sliding cavity 44 and a sliding rod 45; the outer end of the sliding rod 45 is contacted with the inner surface of the lower end of the swinging plate 42, and the inner end of the sliding rod 45 is connected in a sliding cavity 44 in the rotating disc 43 in a sliding way; the rotating disc 43 is fixedly arranged on the outer surface of the middle part of the rotating rod 1; the upper end of the swing plate 42 is hinged at the inner end of the bracket 41; when the rotating rod 1 rotates, the rotating disk 43 is fixedly arranged on the outer surface of the middle of the rotating rod 1, the sliding cavity 44 in the rotating disk 43 is internally and slidably connected with the sliding rod 45, the outer end of the sliding rod 45 is in inner surface contact with the lower end of the swinging plate 42, the rotating rod 1 can drive the sliding rod 45 to be in non-stop intermittent contact with the inner surface of the lower end of the swinging plate 42 when rotating, the upper end of the swinging plate 42 is hinged to the inner end of the bracket 41, the sliding rod 45 rotates to enable the lower end of the swinging plate 42 to do arc reciprocating motion continuously, and therefore molten iron is further scattered, and the molten iron uniformly flows to the lower end.
The lower end of the sliding cavity 44 is hinged with a rotating plate 46, the sliding cavity 44 is filled with high-pressure gas, the lower end of the sliding cavity 44 is filled with plant ash, and a mandril 47 is arranged below the sliding cavity 44; the top rod 47 is fixedly arranged on the upper surface of the inner end of the connecting rod 32; when the moving block 33 moves upwards under the action of hydrogen, the lower end of the sliding cavity 44 is hinged with the rotating plate 46, the sliding cavity 44 is filled with high-pressure gas, the lower end of the sliding cavity 44 is filled with plant ash, the ejector rod 47 is arranged below the sliding cavity 44, and the ejector rod 47 is fixedly installed on the upper surface of the inner end of the connecting rod 32, so that the moving block 33 can drive the ejector rod 47 to move upwards when moving upwards and finally contact with the rotating plate 46 to jack up the rotating plate 46, and meanwhile, the plant ash and iron filings in the sliding cavity 44 fall down along the gap of the rotating plate 46 under the action of the expansion force of the high-pressure gas in the sliding cavity 44 to contact with a vermicular agent, so that the molten iron is prevented from contacting with the atmosphere and overflowing of magnesium vapor, the vermicular reaction can be delayed, the vermicular effect and the inoculation effect.
The specific working flow of the vermicular device is as follows:
in order to manufacture a hydraulic motor shell blank with high creep rate and high strength, high-quality molten iron must be produced; in this case, it is necessary to vermicular the molten iron by the vermicular apparatus, that is:
putting a certain component vermiculizer and an inoculant which are prepared in advance into a ladle, putting a vermiculizer into the ladle, wherein the lower end of a rotating rod 1 is fixedly connected with a connecting rod 32 through a mounting ring 31, the outer end of the connecting rod 32 is connected with a moving block 33, and the moving blocks 33 are connected through a connecting block 34, so when the vermiculizer is put into the ladle, the moving block 33 and the connecting block 34 cover and wrap the vermiculizer and the inoculant, when molten iron is introduced into the ladle through the upper end of the ladle, because the upper end of the rotating rod 1 is fixedly connected with a rotating block 2 and the rotating block 2 is conical, when the molten iron enters the ladle, the molten iron firstly contacts with the rotating block 2 and is uniformly dispersed to the lower end of the rotating block 2 through the rotating block, and is uniformly dispersed to the lower end wall of the ladle through a swinging plate 42 at the lower end to flow to the bottom of the ladle, when the molten iron contacts with the moving block 33, the high temperature of the molten iron heats, namely, the vermicular graphite is evaporated, namely, the steam is introduced into the cavity 36 at the upper end of the moving block 33 and contacts with methane gas in the cavity and generates a chemical reaction to generate hydrogen, when the amount of the hydrogen reaches a certain degree, the moving block 33 is pushed to move upwards, namely, the molten iron uniformly flows into the moving block 33 and contacts with a vermicular agent and an inoculant, so that the vermicular agent is initiated at the bottom of the molten iron, and the influence on the vermicular graphite efficiency caused by the fact that the vermicular agent is not initiated at the bottom of the molten iron is avoided.
When molten iron flows to the upper surface of the rotating block 2, the guide plates 21 are uniformly and fixedly installed on the upper surface of the rotating block 2, and the guide plates 21 are obliquely arranged, so that when the molten iron impacts on the rotating block 2, the rotating block 2 rotates due to the existence of the guide plates 21, the molten iron is dispersed more uniformly under the rotating action of the rotating block, and simultaneously the rotating block 1 is driven to rotate, because the outer surface of the lower end of the rotating block 1 is fixedly provided with the installation ring 31, the outer end of the installation ring 31 is connected with the moving block 33 through the connecting rod 32, and the moving blocks 33 are connected through the connecting block 34, so that the rotating block 2 drives the moving block 33 and the connecting block 34 to rotate when rotating, and because the outer surface of the moving block 33 is fixedly provided with the stirring plate 331, the stirring plate 331 on the outer surface of the moving block 33 is driven to stir the molten iron when rotating, so that, the phenomenon that the molten iron horizontally impacts the vermiculizer to cause the vermiculizer not to detonate at the bottom is avoided.
When the rotating rod 1 is driven by the rotating block 2, the stirring block 11 is fixedly connected to the outer surface of the lower end of the rotating rod 1, so that a vermiculizer and an inoculant can be stirred by the stirring block 11 when the rotating rod 1 rotates, the vermiculizer and the inoculant are fully mixed, and the mixed molten iron is stirred when the molten iron is introduced, so that the molten iron and the vermiculizer are fully mixed, the vermiculizing efficiency is greatly improved, when the rotating rod 1 rotates, a rotating disc 43 is fixedly arranged on the outer surface of the middle part of the rotating rod 1, a sliding rod 45 is connected in a sliding cavity 44 in the rotating disc 43 in a sliding way, the outer end of the sliding rod 45 is in contact with the inner surface of the lower end of the swinging plate 42, so that the sliding rod 45 can drive the sliding rod 45 to be in continuous intermittent contact with the inner surface of the lower end of the swinging plate 42 when the rotating rod 1 rotates, and the sliding rod 45, thereby further scattering the molten iron and enabling the molten iron to uniformly flow to the lower end of the ladle.
When the moving block 33 moves upwards under the action of the buoyancy of hydrogen and molten iron, the lower end of the sliding cavity 44 is hinged with the rotating plate 46, the sliding cavity 44 is filled with high-pressure gas, the lower end of the sliding cavity 44 is filled with plant ash, the ejector rod 47 is arranged below the sliding cavity 44, and the ejector rod 47 is fixedly installed on the upper surface of the inner end of the connecting rod 32, so that the moving block 33 can drive the ejector rod 47 to move upwards when moving upwards and finally contact with the rotating plate 46 to jack up the rotating plate 46, and meanwhile, the plant ash and iron filings in the sliding cavity 44 fall down along the gap of the rotating plate 46 under the action of the expansion force of the high-pressure gas in the sliding cavity 44 to contact with a vermicular agent, so as to prevent the molten iron from contacting with the atmosphere and overflowing of magnesium vapor, delay the vermicular reaction, improve the vermicular and inoculation effects.
When the moving block 33 moves upwards, namely the hydrogen pressure of the cavity 36 inside the moving block 33 is increased, namely, an extrusion force is generated at the outer end of the connecting rod 32, so that the moving block 33 can slide towards the inner end along the connecting rod 32 when moving upwards, and an extrusion force is generated at the connecting block 34, so that the connecting block 34 is bent to form a larger arc surface, and the stirring efficiency of molten iron is further improved by matching with the stirring plate 331, so that the fusion of the molten iron and the vermiculizer is further improved, and meanwhile, when the moving block 33 contracts inwards and slides, the contact of the moving block 33 and the swinging plate 42 when the moving block 33 rises to a certain height can be avoided to influence the working efficiency of.
Through the working process of the vermicular device, the comprehensive performance of the molten iron can be improved, and then the high-performance molten iron is poured into a casting grinding tool of a hydraulic motor shell prepared in advance, so that the high vermicular performance and high strength of the performance of the cast hydraulic motor shell are realized.
Specific experiments are as follows:
for verifying the performance of the hydraulic motor casing cast by the application, the following blank group to experimental group test operations were carried out by the personnel related to the application:
TABLE 1 number of individual material components of the hydraulic motor housing prepared in the manner described above in the present application
The above test cases are as follows:
1. the test conditions are as follows: simultaneously taking 4 groups of molten iron, wherein the quantity of each group of molten iron is calculated by 100 parts:
in a comparison group 1, in 100 parts of molten iron, a common cast iron treatment technology in the prior art is adopted, 0.4 part of vermiculizer and 2 parts of inoculant are added, and then the molten iron with mixed components is poured into a casting mold of a hydraulic motor shell prepared in advance for casting and molding;
in a control group 2, in 100 parts of molten iron, a wire feeding method common in the prior art is adopted to treat cast iron, 0.4 part of vermiculizer and 2 parts of inoculant are added, and then the molten iron with mixed components is poured into a casting mold of a hydraulic motor shell prepared in advance for casting and molding;
in experimental group 3, in 100 parts of molten iron, the cast iron treatment technology of the present application is adopted, 0.4 part of vermiculizer and 2 parts of inoculant are added, and then the molten iron with mixed components is poured into a hydraulic motor shell casting mold prepared in advance for casting molding;
in the experimental group 4, in 100 parts of molten iron, the cast iron treatment technology of the present application is adopted, 0.4 part of vermiculizer, 2 parts of inoculant and 0.8 part of plant ash are added, and then the molten iron with mixed components is poured into a casting mold of a hydraulic motor body shell prepared in advance for casting molding;
note: in each experiment, the components, the sizes and the like of the vermiculizer and the inoculant are the same, and the vermiculizer and the inoculant with the same brand and performance are adopted.
2. Detection format:
sampling materials from the blank of the hydraulic motor body shell cast and molded in the experiments, processing a tensile test rod, performing a tensile test on an Instron material testing machine at a loading speed of 1mm/min, and measuring the tensile strength and the elongation of the material;
processing a metallographic sample from the fracture, grinding and polishing, putting the sample in a 4% nitric acid alcohol solution for corrosion for 5-10 seconds after polishing, and observing the microstructure of the sample by using a DMM-440C metallographic microscope;
and (3) processing a hardness sample at the chuck part of the tensile sample, and measuring the hardness of the tensile sample by using an HB-3000A Brinell hardness tester.
3. And (3) test results: the detection results of the control group 1, the control group 2, the experimental group 3 and the experimental group 4 are respectively as follows:
TABLE 2 Motor casing blank correlation data detected in each experimental result
Note: comparing the metallographic structures (c) and (d) with (a) and (b) in the attached figure 6 of the specification, it can be clearly seen that the creep rate of (c) and (d) is obviously improved compared with (a) and (b), the metallographic structures after the creep become short and thick, and the creep strength is better.
Well known to those skilled in the art are: in the prior art, the vermicular cast iron produced by adopting a wire feeding method has better vermicular effect, tensile strength and material hardness than the vermicular cast iron produced by a conventional punching method; this conclusion is common knowledge in the art and can be obtained from the comparison of the analyses of control 1 and control 2 in Table 2.
The vermicular cast iron produced by the improved punching method has better vermicular rate, tensile strength and material hardness compared with the vermicular cast iron produced by the existing wire feeding method; this conclusion can be obtained by comparing the analyses of the control group 2, the experimental group 3 and the experimental group 4 in table 2.
Combining the above analysis with the graphs allows the following conclusions to be drawn: the performance of the motor body shell blank produced by adopting the improved punching method is better in effect and better in product quality compared with the traditional punching method cast iron treatment technology and the wire feeding method cast iron treatment technology which is better than the traditional punching method, so that the technical scheme of the invention has obvious technical progress!
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (5)
1. A high-creep-rate high-strength hydraulic motor shell blank casting process is characterized by comprising the following steps of: the process comprises the following steps:
s1: placing the prepared vermiculizer and inoculant into a ladle, placing the vermiculizer and the inoculant at the bottom of the ladle, placing the vermiculizer into the ladle, and covering and wrapping the vermiculizer and the inoculant by an isolation mechanism at the lower end of the vermiculizer;
s2: when the vermiculizer and the inoculant in the S1 are covered and wrapped by the isolation mechanism, the molten iron is introduced into the ladle through the upper end of the ladle, the molten iron is scattered to the bottom of the ladle through the scattering mechanism in the middle of the vermiculizing device, and the isolation mechanism is promoted to move upwards by utilizing the high temperature of the molten iron, so that the molten iron is combined with the vermiculizer and the inoculant; plant ash and scrap iron are placed in the scattering mechanism;
s3: when the molten iron in the S2 is combined with the vermiculizer and the inoculant, the isolation mechanism moves upwards, and plant ash and scrap iron in the scattering mechanism are introduced into the vermiculizer and the inoculant by the upward movement of the isolation mechanism, so that the incrustation property is improved;
s4: after the plant ash and the scrap iron in the S3 are combined with the vermiculizer and the inoculant, taking out the vermiculizer in the ladle, and pouring the molten iron after the vermiculization into a casting mold of a hydraulic motor shell prepared in advance for casting;
the vermicularizing devices used in the S1 and the S2 comprise a rotating rod (1), a rotating block (2), an isolating mechanism (3) and a scattering mechanism (4); the device comprises a rotating rod (1), an isolating mechanism (3) is arranged at the lower end of the rotating rod (1), a rotating block (2) is fixedly connected to the upper end of the rotating rod (1), and a scattering mechanism (4) is arranged in the middle of the rotating rod (1); the rotating block (2) is conical, and the rotating block (2) is arranged on the upper side inside the ladle; the isolation mechanism (3) comprises a mounting ring (31), a connecting rod (32), a moving block (33) and a connecting block (34); the mounting ring (31) is fixedly mounted on the outer surface of the lower end of the rotating rod (1), and the outer surface of the mounting ring (31) is uniformly connected with connecting rods (32) in a vertical sliding manner; the outer end of the connecting rod (32) is slidably arranged in the moving block (33); the cross section of the moving block (33) is L-shaped, the moving block (33) is made of a high-strength light high-temperature-resistant composite material, a water cavity (35) is formed in the lower end of the moving block (33), and the moving blocks (33) are connected through a connecting block (34); the connecting block (34) is made of soft metal, and the connecting block (34) is arc-shaped; the water cavity (35) is filled with water, and the water cavity (35) is communicated with an inner cavity (36) at the upper end of the moving block (33); the cavity (36) is filled with methane gas; the scattering mechanism (4) comprises a bracket (41) and a swinging plate (42); the support (41) is in a cross shape, the outer surface of the inner end of the support (41) is connected with a swinging plate (42), and the inner end of the support (41) is rotatably connected with the outer surface of the upper end of the rotating rod (1); the upper end of the swing plate (42) is shorter than the lower end.
2. The high-creep-rate high-strength hydraulic motor body shell blank casting process according to claim 1, characterized in that: guide plates (21) are uniformly and fixedly arranged on the upper surface of the rotating block (2); the guide plate (21) is obliquely arranged; and the outer surface of the moving block (33) is fixedly provided with a stirring plate (331).
3. The high-creep-rate high-strength hydraulic motor body shell blank casting process according to claim 1, characterized in that: the outer surface of the lower end of the rotating rod (1) is fixedly connected with a stirring block (11); the stirring block (11) is conical.
4. The high-creep-rate high-strength hydraulic motor body shell blank casting process according to claim 1, characterized in that: the scattering mechanism (4) also comprises a rotating disc (43), a sliding cavity (44) and a sliding rod (45); the outer end of the sliding rod (45) is in contact with the inner surface of the lower end of the swinging plate (42), and the inner end of the sliding rod (45) is connected in a sliding cavity (44) in the rotating disc (43) in a sliding manner; the rotating disc (43) is fixedly arranged on the outer surface of the middle part of the rotating rod (1); the upper end of the swing plate (42) is hinged at the inner end of the bracket (41).
5. The high-creep-rate high-strength hydraulic motor body shell blank casting process according to claim 4, characterized in that: the lower end of the sliding cavity (44) is hinged with a rotating plate (46), the sliding cavity (44) is filled with high-pressure gas, the lower end of the sliding cavity (44) is filled with plant ash and scrap iron, and a mandril (47) is arranged below the sliding cavity (44); the ejector rod (47) is fixedly arranged on the upper surface of the inner end of the connecting rod (32).
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| WO1991019012A1 (en) * | 1990-05-28 | 1991-12-12 | Ab Volvo | A method of manufacturing compacted graphite cast iron |
| CN103862004A (en) * | 2013-09-06 | 2014-06-18 | 天津市万路科技有限公司 | Molten iron treatment method |
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