CN111001760A - Investment casting shell-making complete equipment and shell-making method thereof - Google Patents
Investment casting shell-making complete equipment and shell-making method thereof Download PDFInfo
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- CN111001760A CN111001760A CN201911335934.XA CN201911335934A CN111001760A CN 111001760 A CN111001760 A CN 111001760A CN 201911335934 A CN201911335934 A CN 201911335934A CN 111001760 A CN111001760 A CN 111001760A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C23/00—Tools; Devices not mentioned before for moulding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C23/00—Tools; Devices not mentioned before for moulding
- B22C23/02—Devices for coating moulds or cores
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
- B22C7/02—Lost patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/12—Treating moulds or cores, e.g. drying, hardening
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Abstract
The invention discloses investment casting shell-making complete equipment and a shell-making method thereof, wherein the investment casting shell-making complete equipment comprises a mechanical arm, a wax mould base, a slurry mixing device and a mixing and spraying device, and the shell-making method comprises a plurality of steps of taking a wax mould, carrying out primary slurry dipping, carrying out primary sand spraying, carrying out primary drying and hardening, carrying out secondary slurry dipping, carrying out secondary sand spraying, carrying out secondary drying and hardening, carrying out subsequent slurry dipping and drying and hardening.
Description
Technical Field
The invention relates to the technical field of special casting equipment, in particular to investment casting shell-making complete equipment and a shell-making method thereof.
Background
Investment casting is also called lost wax casting and comprises the working procedures of wax pressing, wax trimming, tree assembling, slurry dipping, wax melting, metal liquid casting, post-treatment and the like, wherein the slurry dipping is an important investment casting shell-making working procedure of sand pouring and shell making on the basis of a wax mould.
When making the shell, the wax matrix is stained with thick liquid and is required higher to the mixture homogeneity of thick liquids, and for guaranteeing to be stained with thick liquid operation and continue, need be constantly replenishing the thick liquids, otherwise, along influencing system shell effect and be stained with the continuation of thick liquid operation and go on, and, when drenching sand, be stained with thick liquid and drench sand often need repeat many times, drench sand operation and use manual mode to go on usually, drench sand material through manual mode is even and sprinkle on the wax matrix, degree of automation is lower, and this operation has very high requirement to operating personnel's proficiency, otherwise can produce very big influence to drenching sand homogeneity, seriously influence follow-up system shell, it can cause the accidental injury to pay attention to a short time still to do not pay attention to, lead to the wax matrix to scrapping, moreover, intensity of labour is very big.
Disclosure of Invention
The invention aims at the problems and discloses investment casting shell-making complete equipment and a shell-making method thereof.
The specific technical scheme is as follows:
the investment casting shell-making complete equipment is characterized by comprising a mechanical arm, a wax mould base, a slurry mixing device and a mixing and sprinkling device, wherein the top of the wax mould base is a rotary platform deck which is in a disc shape, a plurality of hanging frames are fixedly arranged on the periphery of the rotary platform deck, the slurry mixing device comprises a mixing barrel, a driving mechanism and a stirring mechanism, and the mixing and sprinkling device comprises a mixing and sprinkling barrel body, a barrel body rotating mechanism and a feeding mechanism;
the mixing barrel is arranged above the ground groove, is arranged on the turntable base and freely rotates through the turntable base, the driving mechanism is arranged in the ground groove and comprises a first driving motor, a main transmission shaft and a driven transmission shaft, the first driving motor is fixedly arranged in the ground groove, the working shaft of the driving device is vertically upward, the main transmission shaft is vertically arranged, the upper end and the lower end of the driving device are rotationally connected with the geosyncline through a bearing seat, the working shaft of a first driving motor is connected with the main transmission shaft through a gear and a chain, the first driving motor drives the main transmission shaft to vertically transmit through the gear and the chain, the auxiliary transmission shaft is vertically arranged, the lower end of the bearing bush is rotationally connected with the geosyncline through the bearing block, the upper end of the bearing bush is rotationally connected with the geosyncline through the bearing bush and penetrates through the geosyncline, the first driving motor drives the mixing barrel to rotate through the main transmission shaft and the auxiliary transmission shaft;
the number of the mixing barrels is 4, the mixing barrels are respectively a primary mixing barrel, a secondary mixing barrel, a forming barrel and a working barrel in sequence, the secondary transmission shaft corresponds to the mixing barrels one by one, a vertical upright post is fixedly arranged in the middle of the upper end of the geosyncline, a plurality of horizontally arranged cross rods are arranged on the upright post and correspond to the mixing barrels one by one, the stirring mechanism comprises a stirring motor, a stirring main shaft and stirring blades, the stirring motor is fixedly arranged at the top of the upright post, the working shaft of the stirring motor is vertically upward, the stirring main shaft is vertically and rotatably arranged at the end part of the cross rod through a bearing sleeve and is positioned right above the mixing barrels, and the lower end of the stirring main shaft is fixedly connected with;
the stirring motor is connected with the stirring main shaft above the primary mixing barrel through a gear and a chain to control the rotation of the stirring motor, and the primary mixing barrel, the secondary mixing barrel, the forming barrel and the stirring main shaft above the working barrel are connected through the gear and the chain to realize linkage;
the mixing device comprises a primary mixing barrel, a secondary mixing barrel, a finished material barrel, a working barrel and a feeding pump, wherein the primary mixing barrel is communicated with the secondary mixing barrel, the secondary mixing barrel is communicated with the finished material barrel, and the finished material barrel is communicated with the working barrel through a communicating pipeline, and the feeding pump is arranged in the middle of the communicating pipeline;
the mixing and sprinkling barrel body is in a hollow ellipsoid shape, the long axis of the ellipsoid shape is horizontal, two horizontal ends of the mixing and sprinkling barrel body are opened and are respectively provided with a sand sprinkling port of a feeding port, the barrel body rotating mechanism comprises a rotating guide plate, a rotating motor and a speed reducer, and the feeding mechanism comprises a lifting machine and a feeding pipeline;
the middle part of the outer wall of the mixed spraying barrel body is fixedly provided with a circle of tooth openings which are annularly surrounded, two sides of each tooth opening are provided with symmetrical guide rings, the guide rings are fixedly arranged on the outer wall of the mixed spraying barrel body and are annularly shaped, the cross sections of the guide rings are in a convex shape, the guide rings are symmetrically arranged around the tooth openings, and a plurality of material grooves are uniformly distributed on the inner wall of the mixed spraying barrel body;
the rotary guide plate is vertically arranged, the lower end of the rotary guide plate is fixedly riveted with the ground, the upper end of the rotary guide plate is provided with a guide interface groove, the guide interface groove is in a circular arc shape and is in one-to-one correspondence with the guide rings, the section of the guide interface groove is in a concave shape and is matched with the guide rings, rollers are arranged in the groove and at the notch of the guide interface groove, the rollers are arranged at intervals and are uniformly distributed, the rotary motor and the speed reducer are arranged between the rotary guide plates and below the mixed spraying barrel body, the rotary motor is connected with the input end of the speed reducer, the output end of the speed reducer is meshed with the tooth mouth through a gear, and the mixed spraying barrel body is rotatably arranged on the rotary guide plate;
the lifting machine is arranged on one side of the feeding pipeline, the feeding pipeline is fixedly arranged on one side of the mixing and spraying barrel body through a support, the feeding pipeline sequentially comprises a feeding section, a middle section and a discharging section from top to bottom, the feeding section is communicated with a discharging port of the lifting machine, the discharging section is communicated with a feeding port of the mixing and spraying barrel body, a second driving motor is arranged on the middle section, the second driving motor is vertically arranged, a transmission shaft of the second driving motor faces vertically and is connected with a main shaft, and a plurality of beating sticks are uniformly arranged on the main shaft;
the slurry mixing devices are 3 groups, are arranged around the mechanical arm and are respectively used for preparing first-layer slurry, second-layer slurry and rear-layer slurry; the number of the mixing and sprinkling devices 104 is also 3, and the mixing and sprinkling devices are arranged around the mechanical arm 101 and are used for sprinkling sand of sand materials with different specifications;
the shell making method of the investment casting shell making complete equipment comprises the following specific steps:
(1) taking a wax mould: hanging a wax mould to be processed on a hanging frame on a wax mould base rotating carrying platform through a gate stick, and when the wax mould rotates to a specified position through the rotating carrying platform, grabbing the gate stick by a mechanical arm to take down the wax mould;
(2) dipping slurry for the first time: after grabbing the wax mold, slowly immersing the wax mold into the first layer of slurry by the mechanical arm, rotating the wax mold for 2 circles left and right, controlling the rotating speed to be 5-10 seconds/circle, then lifting the wax mold, waiting for 1-2 minutes, enabling the redundant slurry to naturally flow and clean, slowly rotating the wax mold in the waiting process, enabling the slurry to be uniformly coated on the wax mold, and controlling the rotating speed to be 20-30 seconds/circle;
(3) primary sand spraying: transferring the wax mold subjected to the primary slurry dipping to a mixing and sprinkling device after the primary slurry dipping in the step (2), wherein at the moment, the wax mold is conveyed into a mixing and sprinkling barrel body through a sand sprinkling opening by a mechanical arm, the mixing and sprinkling barrel body rotates to drive sand materials of the mixing and sprinkling barrel body to move upwards and uniformly spread on the wax mold, primary sand sprinkling is carried out, and the sand sprinkling time is controlled to be 1-3 minutes;
(4) primary drying and hardening: after the primary sand spraying is finished, the wax mold is placed back to the hanging rack by the mechanical arm again, the wax mold is naturally dried, then the wax mold is transferred to a magnesium chloride hardening pool for chemical hardening, the hardening lasts for 40-50 minutes, the wax mold is washed by tap water after the hardening is finished, residual hardening liquid is removed, the wax mold is naturally dried, finally the wax mold is sent to a drying chamber, the wax mold is dried for 12-16 hours under the conditions of 45-55% humidity and 70-120 ℃, and the wax mold is returned to the hanging rack after the drying is finished;
(5) secondary slurry dipping: the wax mold after the step (4) is grabbed by the mechanical arm again, slowly immersed into the second layer of slurry, rotated for 2 circles left and right, the rotation speed is controlled to be 5-10 seconds/circle, then the wax mold is lifted up to wait for 1-2 minutes, so that redundant slurry naturally flows and is clean, in the waiting process, the wax mold is slowly rotated to uniformly adhere the slurry to the wax mold, and the rotation speed is controlled to be 20-30 seconds/circle;
(6) secondary sand spraying: transferring the wax mold after the secondary slurry dipping in the step (5) to a mixing and pouring device for secondary sand pouring, wherein the sand pouring time is controlled to be 1-3 minutes;
(7) secondary drying and hardening: after the secondary sand spraying is finished, the wax mold is placed back to the hanging rack by the mechanical arm again, the wax mold is naturally dried, then the wax mold is transferred to a magnesium chloride hardening pool for chemical hardening, the hardening lasts for 40-50 minutes, the wax mold is washed by tap water after the hardening is finished, residual hardening liquid is removed, the wax mold is naturally dried, finally the wax mold is sent to a drying chamber, the wax mold is dried for 12-16 hours under the conditions of 45-55% humidity and 70-120 ℃, and the wax mold is returned to the hanging rack after the drying is finished;
(8) and (3) pasting and drying hardening for the next time:
(8-1) grabbing the wax mold which is finished in the step (7) by the mechanical arm again, slowly immersing the wax mold into the rear-layer slurry, rotating the wax mold for 2 circles left and right at a rotating speed of 5-10 seconds/circle, lifting the wax mold, waiting for 1-2 minutes to enable the redundant slurry to naturally flow and clean, slowly rotating the wax mold in the waiting process to enable the slurry to be uniformly coated on the wax mold, and controlling the rotating speed to be 20-30 seconds/circle;
(8-2) after slurry dipping is finished, transferring the wax mold to a mixing and pouring device, pouring sand, controlling the sand pouring time to be 1-3 minutes, finally, putting the wax mold back to the hanging rack again, and naturally drying;
repeating the steps (8-1) and (8-2) for 3 times after the drying is finished, namely performing the steps (8-1) and (8-2) for 4 times, and finally performing the step (8-1) again, dipping the slurry of the rear layer, naturally drying, feeding the slurry into an aluminum chloride hardening tank for hardening for 40-50 minutes, flushing the wax mold with tap water after the hardening is finished, removing residual hardening liquid, and naturally drying;
(9) dewaxing: and (5) after the step (8) is finished, transferring the wax mold to a dewaxing workshop, dewaxing to obtain an investment casting shell, and finishing shell manufacturing.
The investment casting shell-making complete equipment and the shell-making method thereof are characterized in that the primary slurry dipping in the step (2) is prepared by a slurry mixing device, and the method comprises the following specific steps:
(a1) adding water glass and water into the primary mixing barrel, and adjusting the density to 1.29-1.292g/cm3Continuously stirring the mixture until the mixture is fully mixed to obtain a mixed material A1;
(a2) transferring the obtained mixed material A1 to a second mixing barrel, and adding refined white silica powder successively to obtain a mixed material A2 after mixing fully;
(a3) transferring the obtained mixed material A2 to a forming barrel, adding detergent and n-octanol, fully mixing to obtain slurry, sampling to detect viscosity, wherein the reading of a viscosity flow cup is 48-52S, namely the qualified slurry is qualified, and the qualified slurry is transferred to a working barrel for standby;
wherein the mass ratio of the refined white silica powder to the mixed material A1 is 1.55: 1; adding 18kg of liquid detergent and 500ml of n-octanol into 542kg of the white silica powder;
wherein, if the detected viscosity of the slurry is low, the adjustment can be carried out by slowly adding the refined white silica powder into the forming barrel, and if the detected viscosity of the slurry is high, the adjustment can be carried out by slowly adding the water glass into the forming barrel.
The investment casting shell-making complete equipment and the shell-making method thereof are characterized in that the secondary slurry dipping in the step (5) is prepared by a slurry mixing device, and the method comprises the following specific steps:
(b1) adding water glass and water into the primary mixing barrel, and adjusting the density to 1.29-1.292g/cm3Continuously stirring the mixture until the mixture is fully mixed to obtain a mixed material B1;
(b2) transferring the obtained mixed material B1 to a second mixing barrel, and adding refined white silica powder successively to obtain slurry after mixing fully;
(b3) transferring the slurry obtained in the step (b2) to a forming barrel, sampling and detecting the viscosity, wherein the reading of a viscosity flow cup is 37-42S, namely the qualified slurry is the second-layer slurry, and transferring the qualified slurry to a working barrel for standby;
wherein the mass ratio of the refined white silica powder to the mixed material B1 is 1.45: 1;
wherein, if the detected viscosity of the slurry is low, the adjustment can be carried out by slowly adding the refined white silica powder into the forming barrel, and if the detected viscosity of the slurry is high, the adjustment can be carried out by slowly adding the water glass into the forming barrel.
The investment casting shell-making complete equipment and the shell-making method thereof are characterized in that the back-layer slurry dipping in the step (8) is prepared by a slurry mixing device, and the method comprises the following specific steps:
(c1) adding water glass and water glass into the primary mixing barrelWater, adjusting the density to 1.34-1.37 (g/cm)3) Continuously stirring, and fully mixing to obtain a mixed material C1;
(c2) transferring the obtained mixture B1 to a two-mixing barrel, detecting the sealing again, adjusting the density to the density in the step (c1), and then transferring to a forming barrel;
(c3) sequentially adding refractory clinker into the material forming barrel, fully mixing to obtain the next slurry, and transferring the next slurry to a working barrel for later use;
wherein the mass ratio of the refractory clinker to the mixed material C1 is 1.21: 1.
the investment casting shell-making complete equipment and the shell-making method thereof are characterized in that the sand used for primary sand spraying in the step (3) is refined quartz sand with the mesh number of 40-70 meshes, the sand used for secondary sand spraying in the step (6) is refined quartz sand with the mesh number of 20-40 meshes, and the sand used for sand spraying in the step (8-2) is common quartz sand with the mesh number of 5-10 meshes;
the refined white silica powder is 270-320 # refined white silica powder, and the refractory clinker is 200-270 # refractory clinker; the hardening liquid in the magnesium chloride hardening tank is formed by mixing magnesium chloride and water, and the density of the hardening liquid is 1.23-1.24 (g/cm)3) The pH value is 5-6; the hardening liquid in the aluminum chloride hardening tank is formed by mixing crystalline aluminum chloride and water, and the density of the hardening liquid is 1.21-1.22 (g/cm)3) And the pH value is 3-5.
The investment casting shell-making complete equipment and the shell-making method thereof are characterized in that the stirring blade is in an impeller shape, and the rotation direction of the stirring main shaft is opposite to that of the mixing barrel.
The investment casting shell-making complete equipment and the shell-making method thereof are characterized in that a batching machine is arranged on one side of the primary mixing barrel for quantitatively feeding materials, and the feeding section and the discharging section are obliquely arranged.
The investment casting shell-making complete equipment and the shell-making method thereof are characterized in that a material pipe in a reducing shape is arranged at a feed inlet of the mixing and spraying barrel body, and the material pipe is communicated with a discharge section.
The investment casting shell-making complete equipment and the shell-making method thereof are characterized in that the arc-shaped angle of the guide interface groove is at least 120 degrees, and the middle section is vertically arranged.
The investment casting shell-making complete equipment and the shell-making method thereof are characterized in that a plurality of material troughs are circumferentially and uniformly distributed along the inner wall of the mixing and spraying barrel body.
The invention has the beneficial effects that:
the invention discloses investment casting shell-making complete equipment and a shell-making method thereof, wherein the investment casting shell-making complete equipment comprises a mechanical arm, a wax mould base, a slurry mixing device and a mixing and spraying device, and the shell-making method comprises a plurality of steps of taking a wax mould, carrying out primary slurry dipping, carrying out primary sand spraying, carrying out primary drying and hardening, carrying out secondary slurry dipping, carrying out secondary sand spraying, carrying out secondary drying and hardening, carrying out subsequent slurry dipping and drying and hardening.
Drawings
FIG. 1 is a top plan view of an investment casting shell-making plant of the present invention.
Fig. 2 is a top view of a wax pattern frame.
Fig. 3 is a front view of a slurry mixing device.
Fig. 4 is a cross-sectional view of a slurry mixing device.
FIG. 5 is a top view of the mixing bowl.
Fig. 6 is a schematic view of a mixing and sprinkling apparatus.
Fig. 7 is a sectional view of the mixing and sprinkling apparatus.
FIG. 8 is a sectional view of the guide ring and the rotary guide plate.
FIG. 9 is a cross-sectional view of the shower mixing barrel.
Detailed Description
In order to make the technical solution of the present invention clearer and clearer, the present invention is further described below with reference to embodiments, and any solution obtained by substituting technical features of the technical solution of the present invention with equivalents and performing conventional reasoning falls within the scope of the present invention.
Example one
The investment casting shell-making complete equipment and the shell-making method thereof are characterized in that the investment casting shell-making complete equipment comprises a mechanical arm 101, a wax mould base 102, a slurry mixing device 103 and a mixing and sprinkling device 104, wherein the top of the wax mould base 102 is a rotating platform 105, the rotating platform 105 is in a disc shape, a plurality of hangers 106 are fixedly arranged on the periphery of the rotating platform 105, the slurry mixing device 103 comprises a mixing barrel 1, a driving mechanism 2 and a stirring mechanism 3, and the mixing and sprinkling device 104 comprises a mixing and sprinkling barrel body 30, a barrel body rotating mechanism 31 and a feeding mechanism 32;
the mixing barrel 1 is arranged above the ground groove 4, placed on the rotary table base 5 and freely rotated through the rotary table base 5, the driving mechanism 2 is arranged in the ground groove 4 and comprises a first driving motor 6, a main driving shaft 7 and a driven driving shaft 8, the first driving motor 6 is fixedly arranged in the ground groove 4, a working shaft of the first driving motor 6 is vertically upward, the main driving shaft 7 is vertically arranged, the upper end and the lower end of the main driving shaft are rotatably connected with the ground groove 4 through a bearing seat 9, the working shaft of the first driving motor 6 is connected with the main driving shaft 7 through a gear and a chain, the first driving motor 6 drives the main driving shaft 7 to vertically drive through the gear and the chain, the driven driving shaft 8 is vertically arranged, the lower end of the driven driving shaft is rotatably connected with the ground groove 4 through the bearing seat 9, the upper end of the driven driving shaft is rotatably connected with the ground groove 4 through a bearing sleeve 10 and penetrates through the, the auxiliary transmission shaft 8 is connected with the main transmission shaft 7 through a gear and a chain, and the first driving motor 6 drives the mixing barrel 1 to rotate through the main transmission shaft 7 and the auxiliary transmission shaft 8;
the mixing device comprises 4 mixing barrels 1, a primary mixing barrel 11, a secondary mixing barrel 12, a forming barrel 13 and a working barrel 14, wherein the primary mixing barrel, the secondary mixing barrel 12, the forming barrel 13 and the working barrel 14 are sequentially and respectively arranged, a secondary transmission shaft 8 corresponds to the mixing barrels 1 one by one, a vertical upright post 15 is fixedly arranged in the middle of the upper end of a ground groove 4, a plurality of horizontally arranged cross rods 16 are arranged on the upright post 15, the cross rods 16 correspond to the mixing barrels 1 one by one, a stirring mechanism 3 comprises a stirring motor 17, a stirring main shaft 18 and stirring blades 19, the stirring motor 17 is fixedly arranged at the top of the upright post 15, the working shaft of the stirring motor is vertically upward, the stirring main shaft 18 is vertically and rotatably arranged at the end part of the cross rod 16 through a bearing sleeve 10 and is positioned right;
the stirring motor 17 is connected with the stirring main shaft 18 above the primary mixing barrel 11 through a gear and a chain to control the rotation of the stirring main shaft 18, and the primary mixing barrel 11, the secondary mixing barrel 12, the finished material barrel 13 and the stirring main shaft 18 above the working barrel 14 are connected through the gear and the chain to realize linkage;
wherein, the primary mixing barrel 11 is communicated with the secondary mixing barrel 12, the secondary mixing barrel 12 is communicated with the finished material barrel 13, and the finished material barrel 13 is communicated with the working barrel 14 through a communicating pipeline 20, and a feeding pump 21 is arranged in the middle of the communicating pipeline 20;
the mixing and sprinkling barrel body 30 is in a hollow ellipsoid shape, the long axis of the ellipsoid shape is horizontal, two horizontal ends of the mixing and sprinkling barrel body 30 are opened and are respectively provided with a sand sprinkling port 34 of a feeding port 33, the barrel body rotating mechanism 31 comprises a rotating guide plate 35, a rotating motor 36 and a speed reducer 37, and the feeding mechanism 32 comprises a lifting machine 38 and a feeding pipeline 39;
a circle of tooth openings 40 are fixedly arranged in the middle of the outer wall of the mixed spraying barrel body 30, the tooth openings 40 are annularly surrounded, two sides of each tooth opening 40 are provided with symmetrical guide rings 41, the guide rings 41 are fixedly arranged on the outer wall of the mixed spraying barrel body 30 and are annular, the cross sections of the guide rings 41 are in a convex shape, the guide rings 41 are symmetrically arranged around the tooth openings 40, and a plurality of material grooves 42 are uniformly distributed on the inner wall of the mixed spraying barrel body 30;
the rotary guide plate 35 is vertically arranged, the lower end of the rotary guide plate is fixedly riveted with the ground, the upper end of the rotary guide plate is provided with a guide interface groove 43, the guide interface groove 43 is arc-shaped and corresponds to the guide rings 41 one by one, the section of the guide interface groove 43 is concave and is matched with the guide rings 41, rollers 44 are arranged in the groove and at the notch of the guide interface groove 43, the rollers 44 are arranged at intervals and are uniformly distributed, the rotary motor 36 and the speed reducer 37 are arranged between the rotary guide plates 35 and below the mixed spraying barrel body 30, the rotary motor 36 is connected with the input end of the speed reducer 37, the output end of the speed reducer 37 is meshed with the tooth opening 40 through a gear, the mixed spraying barrel body 30 is rotatably arranged on the rotary guide plate 35 through the guide rings 41 and is driven to rotate through the;
the lifting machine 38 is arranged on one side of the feeding pipeline 39, the feeding pipeline 39 is fixedly arranged on one side of the mixing and sprinkling barrel body 30 through a support, the feeding pipeline 39 sequentially comprises a feeding section 45, an intermediate section 46 and a discharging section 47 from top to bottom, the feeding section 45 is communicated with a discharging hole of the lifting machine 38, the discharging section 47 is communicated with a feeding hole 33 of the mixing and sprinkling barrel body 30, the intermediate section 46 is provided with a second driving motor 48, the second driving motor 48 is vertically arranged, a transmission shaft of the second driving motor is vertically oriented and connected with a main shaft 49, and a plurality of beating sticks 50 are uniformly arranged on the main shaft 49;
the slurry mixing devices 103 are 3 groups, are arranged around the mechanical arm 101, and are respectively used for preparing first-layer slurry, second-layer slurry and rear-layer slurry; the number of the mixing and sprinkling devices 104 is also 3, and the mixing and sprinkling devices are arranged around the mechanical arm 101 and are used for sprinkling sand of sand materials with different specifications.
The slurry mixing device of the embodiment is used for mixing investment casting slurry; when the material mixing barrel is used, the first driving motor is started, the main transmission shaft is driven to rotate through the gear and the chain, the rotating main transmission shaft drives the driven transmission shaft to rotate through the gear and the chain, and then the material mixing barrel is driven to rotate; meanwhile, the stirring motor rotates to drive the stirring main shaft above the primary mixing barrel to rotate through a gear and a chain, and the stirring main shaft above the secondary mixing barrel, the material forming barrel and the working barrel is driven to rotate through the transmission of the gear and the chain, so that the reverse rotation of the mixing barrel and the stirring main shaft is realized, and the slurry is mixed and stirred; when the mixing barrel rotates, the mixing barrel can be guided through the turntable base, so that the stable rotation is ensured; the mixing barrels are used in a classified manner, so that the mixing is convenient to distinguish, and the sampling detection is convenient;
the mixed spraying device of the embodiment is used for sand spraying operation after the wax pattern is stained with slurry; when the wax pattern spraying machine is used, the wax pattern which is completely dipped is sent into the mixed spraying barrel body from the sand spraying opening through the mechanical arm, and the wax pattern is continuously rotated; at the moment, the rotating motor is started, the mixed spraying barrel body is driven to rotate along the horizontal axial direction through the speed reducer and the tooth openings, and when the mixed spraying barrel body rotates, the mixed spraying barrel body is guided through the rotating guide plate and the guide ring, so that the rotating axial direction is stable; the rotating mixed spraying barrel body drives the material groove in the barrel body to move circumferentially, drives the sand material of the mixed spraying barrel body to move upwards, and uniformly spreads the sand material on the wax mold; the sand material of the mixed sprinkling barrel body is supplied by the feeding mechanism, the elevator sends the sand material to the feeding pipeline, the sand material entering the feeding pipeline sequentially passes through the feeding section, the middle section and the discharging section, when the sand material passes through the middle section, the second driving motor drives the main shaft to rotate, and further drives the beating stick to rotate, so as to beat the sand material, break up caking possibly existing in the sand material, and prevent the caking of the sand material from entering the mixed sprinkling barrel body, thereby causing adverse effect on the sand sprinkling effect;
in conclusion, the investment casting shell-making complete equipment is used for shell-making production of investment casting shells; the slurry dipping and sand spraying operation of the wax mould can be automatically carried out, the uniformity and the efficiency of slurry dipping and sand spraying are high, and the shell making efficiency of investment casting can be greatly improved.
Example two
The shell making method of the investment casting shell making complete equipment comprises the following specific steps:
(1) taking a wax mould: hanging a wax mould to be processed on a hanging frame on a wax mould base rotating carrying platform through a gate stick, and when the wax mould rotates to a specified position through the rotating carrying platform, grabbing the gate stick by a mechanical arm to take down the wax mould;
(2) dipping slurry for the first time: after grabbing the wax mold, slowly immersing the wax mold into the first layer of slurry by the mechanical arm, rotating the wax mold for 2 circles left and right, controlling the rotating speed to be 5-10 seconds/circle, then lifting the wax mold, waiting for 1-2 minutes, enabling the redundant slurry to naturally flow and clean, slowly rotating the wax mold in the waiting process, enabling the slurry to be uniformly coated on the wax mold, and controlling the rotating speed to be 20-30 seconds/circle;
(3) primary sand spraying: transferring the wax mold subjected to the primary slurry dipping to a mixing and sprinkling device after the primary slurry dipping in the step (2), wherein at the moment, the wax mold is conveyed into a mixing and sprinkling barrel body through a sand sprinkling opening by a mechanical arm, the mixing and sprinkling barrel body rotates to drive sand materials of the mixing and sprinkling barrel body to move upwards and uniformly spread on the wax mold, primary sand sprinkling is carried out, and the sand sprinkling time is controlled to be 1-3 minutes;
(4) primary drying and hardening: after the primary sand spraying is finished, the wax mold is placed back to the hanging rack by the mechanical arm again, the wax mold is naturally dried, then the wax mold is transferred to a magnesium chloride hardening pool for chemical hardening, the hardening lasts for 40-50 minutes, the wax mold is washed by tap water after the hardening is finished, residual hardening liquid is removed, the wax mold is naturally dried, finally the wax mold is sent to a drying chamber, the wax mold is dried for 12-16 hours under the conditions of 45-55% humidity and 70-120 ℃, and the wax mold is returned to the hanging rack after the drying is finished;
(5) secondary slurry dipping: the wax mold after the step (4) is grabbed by the mechanical arm again, slowly immersed into the second layer of slurry, rotated for 2 circles left and right, the rotation speed is controlled to be 5-10 seconds/circle, then the wax mold is lifted up to wait for 1-2 minutes, so that redundant slurry naturally flows and is clean, in the waiting process, the wax mold is slowly rotated to uniformly adhere the slurry to the wax mold, and the rotation speed is controlled to be 20-30 seconds/circle;
(6) secondary sand spraying: transferring the wax mold after the secondary slurry dipping in the step (5) to a mixing and pouring device for secondary sand pouring, wherein the sand pouring time is controlled to be 1-3 minutes;
(7) secondary drying and hardening: after the secondary sand spraying is finished, the wax mold is placed back to the hanging rack by the mechanical arm again, the wax mold is naturally dried, then the wax mold is transferred to a magnesium chloride hardening pool for chemical hardening, the hardening lasts for 40-50 minutes, the wax mold is washed by tap water after the hardening is finished, residual hardening liquid is removed, the wax mold is naturally dried, finally the wax mold is sent to a drying chamber, the wax mold is dried for 12-16 hours under the conditions of 45-55% humidity and 70-120 ℃, and the wax mold is returned to the hanging rack after the drying is finished;
(8) and (3) pasting and drying hardening for the next time:
(8-1) grabbing the wax mold which is finished in the step (7) by the mechanical arm again, slowly immersing the wax mold into the rear-layer slurry, rotating the wax mold for 2 circles left and right at a rotating speed of 5-10 seconds/circle, lifting the wax mold, waiting for 1-2 minutes to enable the redundant slurry to naturally flow and clean, slowly rotating the wax mold in the waiting process to enable the slurry to be uniformly coated on the wax mold, and controlling the rotating speed to be 20-30 seconds/circle;
(8-2) after slurry dipping is finished, transferring the wax mold to a mixing and pouring device, pouring sand, controlling the sand pouring time to be 1-3 minutes, finally, putting the wax mold back to the hanging rack again, and naturally drying;
repeating the steps (8-1) and (8-2) for 3 times after the drying is finished, namely performing the steps (8-1) and (8-2) for 4 times, and finally performing the step (8-1) again, dipping the slurry of the rear layer, naturally drying, feeding the slurry into an aluminum chloride hardening tank for hardening for 40-50 minutes, flushing the wax mold with tap water after the hardening is finished, removing residual hardening liquid, and naturally drying;
(9) dewaxing: and (5) after the step (8) is finished, transferring the wax mold to a dewaxing workshop, dewaxing to obtain an investment casting shell, and finishing shell manufacturing.
Through the complete equipment for manufacturing the shell, the shell manufacturing process is improved and optimized, so that the purposes of efficiently manufacturing the shell and manufacturing the shell with high quality are achieved, the shell manufacturing efficiency is improved, and the investment casting efficiency is indirectly improved.
EXAMPLE III
In the investment casting shell-making complete equipment and the shell-making method thereof according to the embodiment, the primary slurry dipping in the step (2) is prepared by a slurry mixing device, and the specific steps are as follows:
(a1) adding water glass and water into the primary mixing barrel, and adjusting the density to 1.29-1.292g/cm3Continuously stirring the mixture until the mixture is fully mixed to obtain a mixed material A1;
(a2) transferring the obtained mixed material A1 to a second mixing barrel, and adding refined white silica powder successively to obtain a mixed material A2 after mixing fully;
(a3) transferring the obtained mixed material A2 to a forming barrel, adding detergent and n-octanol, fully mixing to obtain slurry, sampling to detect viscosity, wherein the reading of a viscosity flow cup is 48-52S, namely the qualified slurry is qualified, and the qualified slurry is transferred to a working barrel for standby;
wherein the mass ratio of the refined white silica powder to the mixed material A1 is 1.55: 1; adding 18kg of liquid detergent and 500ml of n-octanol into 542kg of the white silica powder;
wherein, if the detected viscosity of the slurry is low, the adjustment can be carried out by slowly adding the refined white silica powder into the forming barrel, and if the detected viscosity of the slurry is high, the adjustment can be carried out by slowly adding the water glass into the forming barrel.
The secondary slurry dipping of the step (5) is prepared by a slurry mixing device, and the method comprises the following specific steps:
(b1) adding water glass and water into the primary mixing barrel, and adjusting the density to 1.29-1.292g/cm3Continuously stirring the mixture until the mixture is fully mixed to obtain a mixed material B1;
(b2) transferring the obtained mixed material B1 to a second mixing barrel, and adding refined white silica powder successively to obtain slurry after mixing fully;
(b3) transferring the slurry obtained in the step (b2) to a forming barrel, sampling and detecting the viscosity, wherein the reading of a viscosity flow cup is 37-42S, namely the qualified slurry is the second-layer slurry, and transferring the qualified slurry to a working barrel for standby;
wherein the mass ratio of the refined white silica powder to the mixed material B1 is 1.45: 1;
wherein, if the detected viscosity of the slurry is low, the adjustment can be carried out by slowly adding the refined white silica powder into the forming barrel, and if the detected viscosity of the slurry is high, the adjustment can be carried out by slowly adding the water glass into the forming barrel.
The back layer slurry dipping of the step (8) is prepared by a slurry mixing device, and the method comprises the following specific steps:
(c1) adding water glass and water into the primary mixing barrel, and adjusting the density to 1.34-1.37 (g/cm)3) Continuously stirring, and fully mixing to obtain a mixed material C1;
(c2) transferring the obtained mixture B1 to a two-mixing barrel, detecting the sealing again, adjusting the density to the density in the step (c1), and then transferring to a forming barrel;
(c3) sequentially adding refractory clinker into the material forming barrel, fully mixing to obtain the next slurry, and transferring the next slurry to a working barrel for later use;
wherein the mass ratio of the refractory clinker to the mixed material C1 is 1.21: 1.
in the embodiment, the sand used for the primary sand leaching in the step (3) is refined quartz sand with the mesh number of 40-70 meshes, the sand used for the secondary sand leaching in the step (6) is refined quartz sand with the mesh number of 20-40 meshes, and the sand used for the sand leaching in the step (8-2) is common quartz sand with the mesh number of 5-10 meshes;
the refined white silica powder is 270-320 # refined white silica powder, and the refractory clinker is 200-2 #No. 70 refractory clinker; the hardening liquid in the magnesium chloride hardening tank is formed by mixing magnesium chloride and water, and the density of the hardening liquid is 1.23-1.24 (g/cm)3) The pH value is 5-6; the hardening liquid in the aluminum chloride hardening tank is formed by mixing crystalline aluminum chloride and water, and the density of the hardening liquid is 1.21-1.22 (g/cm)3) And the pH value is 3-5.
The embodiment reasonably selects the slurry, the detergent is added after the bonding performance of the primary slurry is improved by the binder, the consistency is carried out, the viscosity is improved at low cost, meanwhile, the n-octanol is added, the coating property of the slurry is improved, the generation of bubbles is reduced, and the slurry is very practical as the slurry of the inner layer of the investment casting shell; more refractory clinker is added in the rear layer when slurry is adhered to the rear layer, so that the heat resistance of the investment casting shell is improved, and cracking and leakage in the casting process are prevented; the slurry has low cost and is suitable for popularization.
Example four
In the investment casting shell-making complete equipment and the shell-making method thereof of the embodiment, the stirring blade is in an impeller shape, and the rotation direction of the stirring main shaft 18 is opposite to the rotation direction of the mixing barrel 1;
wherein, a batching machine is arranged at one side of the primary mixing barrel 11 for quantitatively feeding materials, and the feeding section 45 and the discharging section 47 are obliquely arranged;
a material pipe 51 in a necking shape is arranged at the feed inlet 33 of the mixing and sprinkling barrel body 30, and the material pipe 51 is communicated with the discharge section 47;
the arc-shaped angle of the guide interface groove 43 is at least 120 degrees, and the middle section 46 is vertically arranged;
wherein, a plurality of the silo 42 is the circumference equipartition along mixing the inner wall of drenching staving 30.
By combining the embodiment, the shell making complete equipment is reasonable in design, can be used for shell making production of investment casting shells, can automatically carry out slurry dipping and sand spraying operations of wax molds, is high in uniformity of slurry dipping and sand spraying and high in efficiency, improves and optimizes the shell making process, reasonably selects slurry, greatly reduces the shell making cost, achieves the purposes of efficiently making shells and making shells with high quality, improves the shell making efficiency and indirectly improves the investment casting efficiency.
The investment casting shell-making complete equipment and the shell-making method thereof are used for mixing investment casting slurry;
when the mixing barrel is used, the driving motor is started, the driving transmission shaft is driven to rotate through the gear and the chain, the rotating driving transmission shaft drives the driven transmission shaft to rotate through the gear and the chain, and then the mixing barrel is driven to rotate; meanwhile, the stirring motor rotates to drive the stirring main shaft above the primary mixing barrel to rotate through a gear and a chain, and the stirring main shaft above the secondary mixing barrel, the material forming barrel and the working barrel is driven to rotate through the transmission of the gear and the chain, so that the reverse rotation of the mixing barrel and the stirring main shaft is realized, and the slurry is mixed and stirred;
when the mixing barrel rotates, the mixing barrel can be guided through the turntable base, so that the stable rotation is ensured;
the primary mixing barrel is used for mixing primary materials (water glass and silica powder), the primary mixed materials are fed into the secondary mixing barrel through a communicating pipeline after mixing is finished, the secondary mixing barrel is used for mixing the primary materials and additives (detergent, n-octanol, refractory clinker and the like), slurry is obtained after mixing is finished, then the slurry is fed into a forming barrel through the communicating pipeline, stirring is continued, the mixing uniformity is guaranteed, sampling and viscosity detection are carried out, the qualified slurry is detected to be qualified, and the qualified slurry is fed into a working barrel through the communicating pipeline for wax mold slurry bonding to form a shell;
in conclusion, the wax mold slurry mixing device is simple in structure and reasonable in design, is used for mixing investment casting slurry, performs material mixing division by reasonably planning the number of the material mixing barrels, is synchronous and stable in rotation linkage between the material mixing barrels and between the stirring blades, is independent in rotation and opposite in direction between the material mixing barrels and the stirring blades, is beneficial to improving the material mixing efficiency, improving the mixing uniformity, ensuring the slurry quality and improving the wax mold slurry-sticking shell-making effect.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The investment casting shell-making complete equipment is characterized by comprising a mechanical arm, a wax mould base, a slurry mixing device and a mixing and sprinkling device, wherein the top of the wax mould base is a rotary platform deck which is in a disc shape, a plurality of hanging frames are fixedly arranged on the periphery of the rotary platform deck, the slurry mixing device comprises a mixing barrel, a driving mechanism and a stirring mechanism, and the mixing and sprinkling device comprises a mixing and sprinkling barrel body, a barrel body rotating mechanism and a feeding mechanism;
the mixing barrel is arranged above the ground groove, is arranged on the turntable base and freely rotates through the turntable base, the driving mechanism is arranged in the ground groove and comprises a first driving motor, a main transmission shaft and a driven transmission shaft, the first driving motor is fixedly arranged in the ground groove, the working shaft of the driving device is vertically upward, the main transmission shaft is vertically arranged, the upper end and the lower end of the driving device are rotationally connected with the geosyncline through a bearing seat, the working shaft of a first driving motor is connected with the main transmission shaft through a gear and a chain, the first driving motor drives the main transmission shaft to vertically transmit through the gear and the chain, the auxiliary transmission shaft is vertically arranged, the lower end of the bearing bush is rotationally connected with the geosyncline through the bearing block, the upper end of the bearing bush is rotationally connected with the geosyncline through the bearing bush and penetrates through the geosyncline, the first driving motor drives the mixing barrel to rotate through the main transmission shaft and the auxiliary transmission shaft;
the number of the mixing barrels is 4, the mixing barrels are respectively a primary mixing barrel, a secondary mixing barrel, a forming barrel and a working barrel in sequence, the secondary transmission shaft corresponds to the mixing barrels one by one, a vertical upright post is fixedly arranged in the middle of the upper end of the geosyncline, a plurality of horizontally arranged cross rods are arranged on the upright post and correspond to the mixing barrels one by one, the stirring mechanism comprises a stirring motor, a stirring main shaft and stirring blades, the stirring motor is fixedly arranged at the top of the upright post, the working shaft of the stirring motor is vertically upward, the stirring main shaft is vertically and rotatably arranged at the end part of the cross rod through a bearing sleeve and is positioned right above the mixing barrels, and the lower end of the stirring main shaft is fixedly connected with;
the stirring motor is connected with the stirring main shaft above the primary mixing barrel through a gear and a chain to control the rotation of the stirring motor, and the primary mixing barrel, the secondary mixing barrel, the forming barrel and the stirring main shaft above the working barrel are connected through the gear and the chain to realize linkage;
the mixing device comprises a primary mixing barrel, a secondary mixing barrel, a finished material barrel, a working barrel and a feeding pump, wherein the primary mixing barrel is communicated with the secondary mixing barrel, the secondary mixing barrel is communicated with the finished material barrel, and the finished material barrel is communicated with the working barrel through a communicating pipeline, and the feeding pump is arranged in the middle of the communicating pipeline;
the mixing and sprinkling barrel body is in a hollow ellipsoid shape, the long axis of the ellipsoid shape is horizontal, two horizontal ends of the mixing and sprinkling barrel body are opened and are respectively provided with a sand sprinkling port of a feeding port, the barrel body rotating mechanism comprises a rotating guide plate, a rotating motor and a speed reducer, and the feeding mechanism comprises a lifting machine and a feeding pipeline;
the middle part of the outer wall of the mixed spraying barrel body is fixedly provided with a circle of tooth openings which are annularly surrounded, two sides of each tooth opening are provided with symmetrical guide rings, the guide rings are fixedly arranged on the outer wall of the mixed spraying barrel body and are annularly shaped, the cross sections of the guide rings are in a convex shape, the guide rings are symmetrically arranged around the tooth openings, and a plurality of material grooves are uniformly distributed on the inner wall of the mixed spraying barrel body;
the rotary guide plate is vertically arranged, the lower end of the rotary guide plate is fixedly riveted with the ground, the upper end of the rotary guide plate is provided with a guide interface groove, the guide interface groove is in a circular arc shape and is in one-to-one correspondence with the guide rings, the section of the guide interface groove is in a concave shape and is matched with the guide rings, rollers are arranged in the groove and at the notch of the guide interface groove, the rollers are arranged at intervals and are uniformly distributed, the rotary motor and the speed reducer are arranged between the rotary guide plates and below the mixed spraying barrel body, the rotary motor is connected with the input end of the speed reducer, the output end of the speed reducer is meshed with the tooth mouth through a gear, and the mixed spraying barrel body is rotatably arranged on the rotary guide plate;
the lifting machine is arranged on one side of the feeding pipeline, the feeding pipeline is fixedly arranged on one side of the mixing and spraying barrel body through a support, the feeding pipeline sequentially comprises a feeding section, a middle section and a discharging section from top to bottom, the feeding section is communicated with a discharging port of the lifting machine, the discharging section is communicated with a feeding port of the mixing and spraying barrel body, a second driving motor is arranged on the middle section, the second driving motor is vertically arranged, a transmission shaft of the second driving motor faces vertically and is connected with a main shaft, and a plurality of beating sticks are uniformly arranged on the main shaft;
the slurry mixing devices are 3 groups, are arranged around the mechanical arm and are respectively used for preparing first-layer slurry, second-layer slurry and rear-layer slurry; the number of the mixing and sprinkling devices 104 is also 3, and the mixing and sprinkling devices are arranged around the mechanical arm 101 and are used for sprinkling sand of sand materials with different specifications;
the shell making method of the investment casting shell making complete equipment comprises the following specific steps:
(1) taking a wax mould: hanging a wax mould to be processed on a hanging frame on a wax mould base rotating carrying platform through a gate stick, and when the wax mould rotates to a specified position through the rotating carrying platform, grabbing the gate stick by a mechanical arm to take down the wax mould;
(2) dipping slurry for the first time: after grabbing the wax mold, slowly immersing the wax mold into the first layer of slurry by the mechanical arm, rotating the wax mold for 2 circles left and right, controlling the rotating speed to be 5-10 seconds/circle, then lifting the wax mold, waiting for 1-2 minutes, enabling the redundant slurry to naturally flow and clean, slowly rotating the wax mold in the waiting process, enabling the slurry to be uniformly coated on the wax mold, and controlling the rotating speed to be 20-30 seconds/circle;
(3) primary sand spraying: transferring the wax mold subjected to the primary slurry dipping to a mixing and sprinkling device after the primary slurry dipping in the step (2), wherein at the moment, the wax mold is conveyed into a mixing and sprinkling barrel body through a sand sprinkling opening by a mechanical arm, the mixing and sprinkling barrel body rotates to drive sand materials of the mixing and sprinkling barrel body to move upwards and uniformly spread on the wax mold, primary sand sprinkling is carried out, and the sand sprinkling time is controlled to be 1-3 minutes;
(4) primary drying and hardening: after the primary sand spraying is finished, the wax mold is placed back to the hanging rack by the mechanical arm again, the wax mold is naturally dried, then the wax mold is transferred to a magnesium chloride hardening pool for chemical hardening, the hardening lasts for 40-50 minutes, the wax mold is washed by tap water after the hardening is finished, residual hardening liquid is removed, the wax mold is naturally dried, finally the wax mold is sent to a drying chamber, the wax mold is dried for 12-16 hours under the conditions of 45-55% humidity and 70-120 ℃, and the wax mold is returned to the hanging rack after the drying is finished;
(5) secondary slurry dipping: the wax mold after the step (4) is grabbed by the mechanical arm again, slowly immersed into the second layer of slurry, rotated for 2 circles left and right, the rotation speed is controlled to be 5-10 seconds/circle, then the wax mold is lifted up to wait for 1-2 minutes, so that redundant slurry naturally flows and is clean, in the waiting process, the wax mold is slowly rotated to uniformly adhere the slurry to the wax mold, and the rotation speed is controlled to be 20-30 seconds/circle;
(6) secondary sand spraying: transferring the wax mold after the secondary slurry dipping in the step (5) to a mixing and pouring device for secondary sand pouring, wherein the sand pouring time is controlled to be 1-3 minutes;
(7) secondary drying and hardening: after the secondary sand spraying is finished, the wax mold is placed back to the hanging rack by the mechanical arm again, the wax mold is naturally dried, then the wax mold is transferred to a magnesium chloride hardening pool for chemical hardening, the hardening lasts for 40-50 minutes, the wax mold is washed by tap water after the hardening is finished, residual hardening liquid is removed, the wax mold is naturally dried, finally the wax mold is sent to a drying chamber, the wax mold is dried for 12-16 hours under the conditions of 45-55% humidity and 70-120 ℃, and the wax mold is returned to the hanging rack after the drying is finished;
(8) and (3) pasting and drying hardening for the next time:
(8-1) grabbing the wax mold which is finished in the step (7) by the mechanical arm again, slowly immersing the wax mold into the rear-layer slurry, rotating the wax mold for 2 circles left and right at a rotating speed of 5-10 seconds/circle, lifting the wax mold, waiting for 1-2 minutes to enable the redundant slurry to naturally flow and clean, slowly rotating the wax mold in the waiting process to enable the slurry to be uniformly coated on the wax mold, and controlling the rotating speed to be 20-30 seconds/circle;
(8-2) after slurry dipping is finished, transferring the wax mold to a mixing and pouring device, pouring sand, controlling the sand pouring time to be 1-3 minutes, finally, putting the wax mold back to the hanging rack again, and naturally drying;
repeating the steps (8-1) and (8-2) for 3 times after the drying is finished, namely performing the steps (8-1) and (8-2) for 4 times, and finally performing the step (8-1) again, dipping the slurry of the rear layer, naturally drying, feeding the slurry into an aluminum chloride hardening tank for hardening for 40-50 minutes, flushing the wax mold with tap water after the hardening is finished, removing residual hardening liquid, and naturally drying;
(9) dewaxing: and (5) after the step (8) is finished, transferring the wax mold to a dewaxing workshop, dewaxing to obtain an investment casting shell, and finishing shell manufacturing.
2. The investment casting shell-making plant and the shell-making method thereof as claimed in claim 1, wherein the primary slurry of the step (2) is made by a slurry mixing device, comprising the following steps:
(a1) adding water glass and water into the primary mixing barrel, and adjusting the density to 1.29-1.292g/cm3Continuously stirring the mixture until the mixture is fully mixed to obtain a mixed material A1;
(a2) transferring the obtained mixed material A1 to a second mixing barrel, and adding refined white silica powder successively to obtain a mixed material A2 after mixing fully;
(a3) transferring the obtained mixed material A2 to a forming barrel, adding detergent and n-octanol, fully mixing to obtain slurry, sampling to detect viscosity, wherein the reading of a viscosity flow cup is 48-52S, namely the qualified slurry is qualified, and the qualified slurry is transferred to a working barrel for standby;
wherein the mass ratio of the refined white silica powder to the mixed material A1 is 1.55: 1; adding 18kg of liquid detergent and 500ml of n-octanol into 542kg of the white silica powder;
wherein, if the detected viscosity of the slurry is low, the adjustment can be carried out by slowly adding the refined white silica powder into the forming barrel, and if the detected viscosity of the slurry is high, the adjustment can be carried out by slowly adding the water glass into the forming barrel.
3. The investment casting shell-making plant and the shell-making method thereof as claimed in claim 2, wherein the secondary slurry of the step (5) is made by a slurry mixing device, comprising the following steps:
(b1) adding water glass and water into the primary mixing barrel, and adjusting the density to 1.29-1.292g/cm3Continuously stirring the mixture until the mixture is fully mixed to obtain a mixed material B1;
(b2) transferring the obtained mixed material B1 to a second mixing barrel, and adding refined white silica powder successively to obtain slurry after mixing fully;
(b3) transferring the slurry obtained in the step (b2) to a forming barrel, sampling and detecting the viscosity, wherein the reading of a viscosity flow cup is 37-42S, namely the qualified slurry is the second-layer slurry, and transferring the qualified slurry to a working barrel for standby;
wherein the mass ratio of the refined white silica powder to the mixed material B1 is 1.45: 1;
wherein, if the detected viscosity of the slurry is low, the adjustment can be carried out by slowly adding the refined white silica powder into the forming barrel, and if the detected viscosity of the slurry is high, the adjustment can be carried out by slowly adding the water glass into the forming barrel.
4. The investment casting shell-making plant and the shell-making method thereof as claimed in claim 3, wherein the back layer slurry of the step (8) is prepared by a slurry mixing device, comprising the following steps:
(c1) adding water glass and water into the primary mixing barrel, and adjusting the density to 1.34-1.37 (g/cm)3) Continuously stirring, and fully mixing to obtain a mixed material C1;
(c2) transferring the obtained mixture B1 to a two-mixing barrel, detecting the sealing again, adjusting the density to the density in the step (c1), and then transferring to a forming barrel;
(c3) sequentially adding refractory clinker into the material forming barrel, fully mixing to obtain the next slurry, and transferring the next slurry to a working barrel for later use;
wherein the mass ratio of the refractory clinker to the mixed material C1 is 1.21: 1.
5. the investment casting shell-making complete equipment and the shell-making method thereof according to claim 1 or 4, wherein the sand used for the primary sand-pouring in the step (3) is refined quartz sand with the mesh number of 40-70 meshes, the sand used for the secondary sand-pouring in the step (6) is refined quartz sand with the mesh number of 20-40 meshes, and the sand used for the sand-pouring in the step (8-2) is common quartz sand with the mesh number of 5-10 meshes;
the refined white silica powder is 270-320 # refined white silica powder, and the refractory clinker is 200-270 # refractory clinker; the hardening liquid in the magnesium chloride hardening tank is formed by mixing magnesium chloride and water, and the density of the hardening liquid is 1.23-1.24 (g/cm)3)，PHA value of 5 to 6; the hardening liquid in the aluminum chloride hardening tank is formed by mixing crystalline aluminum chloride and water, and the density of the hardening liquid is 1.21-1.22 (g/cm)3) And the pH value is 3-5.
6. The investment casting shell-making kit and the shell-making method thereof as claimed in claim 5, wherein the stirring blade is in the form of an impeller, and the rotation direction of the stirring spindle is opposite to the rotation direction of the mixing bowl.
7. The investment casting shell-making plant and the shell-making method thereof according to claim 6, wherein a dosing machine is arranged at one side of the primary mixing barrel for dosing the material, and the feeding section and the discharging section are obliquely arranged.
8. The investment casting shell-making complete equipment and the shell-making method thereof as claimed in claim 5 or 7, wherein a throat-shaped material pipe is arranged at the feed inlet of the mixing and sprinkling barrel body, and the material pipe is communicated with the discharge section.
9. The investment casting shell-making kit and method of claim 8 wherein the angle of the arc of the slot is at least 120 ° and the intermediate section is vertically disposed.
10. The investment casting shell-making plant and the shell-making method thereof as claimed in claim 9, wherein a plurality of the troughs are circumferentially distributed along the inner wall of the shower barrel body.
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| CN113020542A (en) * | 2021-02-26 | 2021-06-25 | 李格腾 | Investment casting shell-making manipulator |
| CN113814351A (en) * | 2021-10-25 | 2021-12-21 | 湖州南丰机械制造有限公司 | Rapid shell manufacturing method of shell for precision casting |
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| CN114535513A (en) * | 2022-01-04 | 2022-05-27 | 济南市平阴县玛钢厂 | Automatic slurry dipping and sand spraying system for sand shell preparation process |
| CN114505447A (en) * | 2022-02-15 | 2022-05-17 | 上海交通大学 | Wax mold tray for large-scale complex thin-wall casting, wax mold slurry-sticking shell-making system and method |
| CN114603084A (en) * | 2022-03-22 | 2022-06-10 | 辛集冀时达机械制造有限公司 | Precision investment casting equipment and investment casting method thereof |
| CN114603084B (en) * | 2022-03-22 | 2023-11-03 | 广西平果铝资源科技有限公司 | Precision investment casting equipment and investment casting method thereof |
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Application publication date: 20200414 |