CN108213358B - Lost foam casting sand box for integrally casting middle groove and process - Google Patents
Lost foam casting sand box for integrally casting middle groove and process Download PDFInfo
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- CN108213358B CN108213358B CN201810028875.0A CN201810028875A CN108213358B CN 108213358 B CN108213358 B CN 108213358B CN 201810028875 A CN201810028875 A CN 201810028875A CN 108213358 B CN108213358 B CN 108213358B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C21/00—Flasks; Accessories therefor
- B22C21/02—Sectional flasks, i.e. with divided, articulated, or interchangeable side sections
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C21/00—Flasks; Accessories therefor
- B22C21/08—Clamping equipment
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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
- B22C9/046—Use of patterns which are eliminated by the liquid metal in the mould
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
- B22C9/24—Moulds for peculiarly-shaped castings for hollow articles
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The invention discloses a lost foam casting sand box for integrally casting a middle groove and a process thereof, wherein the casting sand box comprises an upper box body, a middle box body and a lower box body which are fixedly connected, a vacuum exhaust hole, a sand box exhaust hole, a hoisting part and a sand discharge hole which is positioned on the box body are arranged on the box body, and the joints of the box bodies are provided with soft rubber sheets for sealing; the integral casting process of the middle groove comprises a die manufacturing step, a casting step and a heat treatment step, the existing welding procedure is omitted, welding deformation and welding seam cracking are avoided, the integral casting process has the advantages of being good in mechanical performance, good in service performance, high in coal passing amount, high in production efficiency and the like, the size stability and the service life of the middle groove are improved, and the integral casting process is easy to popularize and use.
Description
Technical Field
The invention relates to the technical field of middle groove lost foam casting, in particular to a lost foam casting sand box for integrally casting a middle groove and a process.
Background
With the rapid development of the coal industry and the construction of large energy bases in China, the modern mine coal mining equipment has obvious trend of large-scale and automatic development, and the demand of large-scale high-end fully mechanized mining equipment is more and more large.
Scraper conveyors are used as main transport equipment for coal transportation and play an important role in coal production. The middle groove is a key part for manufacturing the scraper conveyor, is positioned in the middle of the scraper conveyor, is a running track of a scraper chain, a running track of a coal mining machine, a running channel for carrying coal flow, and is also a part with the largest using amount and the heaviest mass on the scraper conveyor. The middle groove comprises a baffle ledge, a shovel board ledge, a middle plate and a bottom plate. At present, ledge casting is mostly adopted, and then a plurality of parts such as the ledge, a middle plate and the like are welded into a component for use, and a Chinese patent with the application number of CN201710345994 discloses a manufacturing process of a middle trough of a scraper conveyor of a coal face, which comprises a casting step, a heat treatment step and a welding step, wherein the casting step comprises the steps of casting a blank of the middle trough ledge, then carrying out cutting, heat treatment and cooling, and then forming; the heat treatment step comprises normalizing, cooling and preserving heat, tempering and finally cooling treatment on the middle groove ledge; the welding step is to weld the middle plate and the bottom plate on the groove side to form a middle groove, but the middle groove is often cracked and deformed by welding, so that the problems of short service life, low coal passing amount, low production efficiency and the like of the middle groove are caused.
The lost foam casting is a forming casting method which firstly makes a foam plastic model into a mould according to the structural and technological dimension requirements of a casting part to be produced, dips and coats high-temperature resistant coating, dries the mould, puts the mould into a casting sand box, fills dry sand according to the technological requirements, compacts the mould through three-dimensional vibration, pours molten metal into the mould in a vacuumizing state, leads the foam plastic model to be gasified and extracted by heating, then is replaced by liquid metal, cools and solidifies to form a casting. When a traditional box-type lost foam mold is adopted for casting the middle groove, the travelling crane carrying capacity is small, the density of the jewel sand is high, the weight of the whole sand box after pouring is overweight, the travelling crane hoisting cannot be used, the height and the stress condition of sand at the bottom of the sand box cannot be observed during sand filling, and the sand at the bottom of the sand box is easy to fill unevenly, so that the stress of the mold is uneven, and the final product is deformed.
The present invention has been made in view of the above circumstances.
Disclosure of Invention
The invention aims to provide a combined lost foam casting sand box for integrally casting a middle groove, which can be opened layer by a box opener, reduces the load of a travelling crane and improves the working efficiency, and a casting process thereof.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a disappearance mould casting sand box of whole casting middle part groove, includes the box, establishes vacuum exhaust hole, sand box aspirating hole and hoisting part on the box, its characterized in that: the box body comprises an upper box body and a lower box body which are fixedly connected, and a sand discharging hole fixedly connected with a cover is formed in the box body.
As a further scheme of the invention: the box body at least comprises a middle box body fixedly connected with the upper box body and the lower box body.
As a further scheme of the invention: the joint of the box body is provided with a soft rubber for sealing.
As a further scheme of the invention: the box outside is equipped with the strengthening rib, hoist and mount part is established in strengthening rib department.
As a further scheme of the invention: the sand box structure is characterized by further comprising a positioning device and a sand box fastening device which are arranged at the joint of the box body.
As a further scheme of the invention: the positioning device is a positioning pin, and the positioning pin is arranged on a convex block on the outer side of the junction of the box body to guide and position the box body.
As a further scheme of the invention: the sand box fastening device comprises an eyelet bolt fixed on a convex block at the connecting part of the box body, a pin shaft arranged on the convex block at the connecting part of the connected box body and inserted through the annular end of the eyelet bolt, and a cotter pin arranged in the pin shaft hole.
A casting process for integrally casting a middle groove by using the lost foam casting sand box comprises the following steps: the method comprises the steps of manufacturing a mould, casting and heat treatment, wherein the step of manufacturing the mould comprises the following steps:
1. manufacturing a foam plate;
2. carrying out parting treatment on the die through process design;
3. drawing a mould sample plate, and then heating by a nickel-chromium wire to cut the foam plate by using the sample plate to manufacture a mould; the method is characterized in that: the casting step is as follows:
1. brushing the high-temperature-resistant paint on the surface of the mold for 5-6 times, wherein the thickness of the high-temperature-resistant paint is 0.5mm each time;
2. placing the mould into the sand box to perform layer-by-layer shakeout compaction;
3. starting a vacuum pump to pump out air in the dry sand, wherein the vacuum pressure is 0.06-0.07MPa,
4. tapping when the temperature of molten steel is 1630-1650 ℃, controlling the temperature in the ladle to be 1550-1600 ℃, controlling the total pouring time to be 60s, after pouring is completed for 72 hours, releasing sand through a sand release port of a sand box, opening the box, and performing cutting processing on the cast and formed middle groove blank;
the heat treatment step is as follows:
1. annealing process for integrally cast middle groove
When the temperature is between 0 and 560 ℃, the temperature is raised to 80 ℃ per hour, the temperature is raised to between 560 and 640 ℃, the temperature is raised to between 640 and 880 ℃ per hour, the temperature is raised to between 100 ℃ per hour, the temperature is raised to 880 ℃, the temperature is kept for 3 hours, and the furnace is cooled;
2. quenching process for integral casting middle groove
Heating to 100 ℃ per hour, heating to 880 ℃, preserving heat for 3 hours, and cooling the quenching liquid;
3. tempering process for integrally cast middle groove
Heating to 100 degree per hour, heating to 550 degree per hour, keeping the temperature for 4 hours, and cooling in air.
Compared with the prior art, the invention has the beneficial effects that:
1. the combined casting sand box is adopted, operators can see the combined casting sand box in a sand filling process, deformation caused by insufficient sand filling and uneven stress of a mould is effectively prevented, meanwhile, the sand box is molded in sections, the problem that the mould cannot be produced due to the load of a travelling crane can be effectively prevented, casting deformation and the operation difficulty of workers are greatly reduced, the production efficiency and the production capacity are greatly improved, the production cost is reduced, the sand box can be repeatedly used, and the combined casting sand box is simple to manufacture, convenient to use and high in applicability.
2. The lost foam casting process for integrally casting the middle groove is adopted, the original welding procedure is omitted, the process is simplified, the production cost and the labor intensity of workers are reduced, the integral mechanical performance of the middle groove of the scraper conveyor can be effectively improved, and the scraper conveyor with higher structural size precision is obtained.
Drawings
FIG. 1 is a schematic view of a lost foam casting flask of the present invention for integrally casting a center channel;
FIG. 2 is a left side view of FIG. 1;
in the figure:
1-upper box body 2-middle box body 3-sand box sand discharging hole 4-lower box body 5-vacuum exhaust hole
6-hoisting part 7-positioning device 8-sand box fastening device 9-sand box suction hole.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 and 2, the invention discloses an evaporative pattern casting sand box for integrally casting a middle trough, which comprises a square upper box body 1, a middle box body 2 and a lower box body 4 which are fixedly connected, a plurality of vacuum exhaust holes 5, sand box suction holes 9 and hoisting parts 6 which are arranged on the box bodies, and square sand box sand discharge holes 3 which are fixedly connected with covers and arranged on the box bodies, wherein soft rubber sheets for sealing are arranged at joints of the box bodies, so that the sealing performance of the box bodies can be ensured. The box outside is equipped with the strengthening rib, hoist and mount part 6 is established in strengthening rib department, hoists the box when conveniently opening and shutting.
The sand box fixing device is characterized by further comprising a positioning device 7 and a sand box fastening device 8 which are arranged at the junction of the box body, wherein the positioning device 7 is a positioning pin, and the box body is convenient to disassemble and assemble by installing the positioning pin on a convex block on the outer side of the junction of the box body to guide and position the box body.
The sand box fastening device 8 comprises an eyelet bolt fixed on a convex block at the connecting part of the box body, a pin shaft arranged on the convex block at the connecting part of the box body to be connected and inserted through the annular end of the eyelet bolt, and a hairpin type cotter pin arranged in the pin shaft hole, and has the advantages of tight and reliable connection and repeated disassembly and assembly.
The process steps of using the lost foam casting sand box to integrally cast the middle groove are as follows: the method comprises the steps of manufacturing a mould, casting and heat treatment, wherein the step of manufacturing the mould comprises the following steps:
1. H-S Longwang fine material is selected to be foamed into a foam plate with the weight of about 18kg/m3；
2. Carrying out parting treatment on the die through process design;
3. drawing a mould template by using CAD two-dimensional software, and then cutting the foam plate by using the template through heating of a nickel-chromium wire to manufacture a mould;
casting:
1. brushing high-temperature-resistant paint on the surface of the mold for about 5-6 times, wherein the thickness of the paint is 0.5mm each time;
2. when the sand boxes are connected and fixed, the sand boxes are sealed by using soft rubber, and the mould is placed into the three sand boxes to perform layer-by-layer sand falling compaction;
3. starting a vacuum pump to pump out air in the dry sand, wherein the vacuum pressure is 0.06-0.07 MPa;
4. tapping when the temperature of the molten steel is 1630-1650 ℃, controlling the temperature in the ladle to be 1550-1600 ℃, quickly pouring when pouring is started, then slowing down the pouring speed when the temperature of the molten steel is 3/4S, controlling the total time to be 60S, after the pouring is finished for 72 hours, discharging sand through the sand discharge port, opening the box, and performing cutting processing on the cast and formed middle groove blank to form;
a heat treatment step:
1. annealing process for integrally cast middle groove
When the temperature is between 0 and 560 ℃, the temperature is raised to 80 ℃ per hour, the temperature is raised to between 560 and 640 ℃, the temperature is raised to between 640 and 880 ℃ per hour, the temperature is raised to between 100 ℃ per hour, the temperature is raised to 880 ℃, the temperature is kept for 3 hours, and the furnace is cooled;
2. quenching process for integral casting middle groove
Heating to 100 ℃ per hour, heating to 880 ℃, preserving heat for 3 hours, and cooling the quenching liquid;
3. tempering process for integrally cast middle groove
Heating to 100 degree per hour, heating to 550 degree per hour, keeping the temperature for 4 hours, and cooling in air.
The lost foam casting process for integrally casting the middle groove omits the existing welding procedure, is simple and convenient, is easy to operate, greatly reduces the working strength and the production cost of workers, improves the production efficiency, and simultaneously improves the integral mechanical property of the middle groove.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (3)
1. The utility model provides a disappearance mould casting sand box of whole casting middle part groove, includes the box, establishes vacuum exhaust hole, sand box aspirating hole and hoisting part on the box, its characterized in that: the box body comprises an upper box body and a lower box body which are fixedly connected, and a sand discharging hole which is positioned on the box body and is fixedly connected with a cover, the box body at least also comprises a middle box body which is fixedly connected with the upper box body and the lower box body, the joint of the box bodies is provided with a soft rubber for sealing, the outer side of the box body is provided with a reinforcing rib, the hoisting part is arranged at the reinforcing rib, and the box body also comprises a positioning device and a sand box fastening device which are arranged at the joint of the box bodies;
adopting the lost foam casting sand box to integrally cast the middle groove: comprises a die manufacturing step, a casting step and a heat treatment step;
the manufacturing steps of the die are as follows:
1) manufacturing a foam plate;
2) carrying out parting treatment on the die through process design;
3) drawing a mould sample plate, and then heating by a nickel-chromium wire to cut the foam plate by using the sample plate to manufacture a mould; the casting step is as follows:
1) brushing the high-temperature-resistant paint on the surface of the mold for 5-6 times, wherein the thickness of the high-temperature-resistant paint is 0.5mm each time;
2) placing the mould into the sand box to perform layer-by-layer shakeout compaction;
3) starting a vacuum pump to pump out air in the dry sand, wherein the vacuum pressure is 0.06-0.07 MPa;
4) tapping when the temperature of molten steel is 1630-1650 ℃, controlling the temperature in the ladle to be 1550-1600 ℃, controlling the total pouring time to be 60s, after pouring is completed for 72 hours, releasing sand through a sand release port of a sand box, opening the box, and forming a cast and formed middle groove blank after cutting;
the heat treatment step is as follows:
1) annealing process for integrally cast middle groove
When the temperature is between 0 and 560 ℃, the temperature is raised to 80 ℃ per hour, the temperature is raised to between 560 and 640 ℃, the temperature is raised to between 640 and 880 ℃ per hour, the temperature is raised to between 100 ℃ per hour, the temperature is raised to 880 ℃, the temperature is kept for 3 hours, and the furnace is cooled;
2) quenching process for integral casting middle groove
Heating to 100 ℃ per hour, heating to 880 ℃, preserving heat for 3 hours, and cooling the quenching liquid;
3) tempering process for integrally cast middle groove
Heating to 100 degree per hour, heating to 550 degree per hour, keeping the temperature for 4 hours, and cooling in air.
2. A lost foam casting flask for integrally casting a tundish according to claim 1 wherein: the positioning device is a positioning pin, and the positioning pin is arranged on a convex block on the outer side of the junction of the box body to guide and position the box body.
3. A lost foam casting flask for integrally casting a tundish according to claim 2 wherein: the sand box fastening device comprises an eyelet bolt fixed on a convex block at the connecting part of the box body, a pin shaft arranged on the convex block at the connecting part of the connected box body and inserted through the annular end of the eyelet bolt, and a cotter pin arranged in the pin shaft hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810028875.0A CN108213358B (en) | 2018-01-12 | 2018-01-12 | Lost foam casting sand box for integrally casting middle groove and process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810028875.0A CN108213358B (en) | 2018-01-12 | 2018-01-12 | Lost foam casting sand box for integrally casting middle groove and process |
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| Publication Number | Publication Date |
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| CN108213358A CN108213358A (en) | 2018-06-29 |
| CN108213358B true CN108213358B (en) | 2021-04-20 |
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| CN111390112B (en) * | 2020-04-15 | 2024-06-11 | 宁夏苏宁新能源设备有限公司 | Middle ledge lost foam casting mold and casting method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01181944A (en) * | 1988-01-16 | 1989-07-19 | Okazaki Kousanbutsu Kk | Casting method with lost foam pattern |
| CN1186145C (en) * | 2003-01-10 | 2005-01-26 | 刘立中 | Casting box reversal type technique in vanish mould casting |
| CN1911557A (en) * | 2005-08-08 | 2007-02-14 | 冯玉全 | Method for casting miodle trough casting of coal mine scraper conveyor using demould |
| CN101462160B (en) * | 2007-12-20 | 2011-05-25 | 比亚迪股份有限公司 | Full-mold casting technique of resin-bonded sand |
| CN203030844U (en) * | 2012-12-25 | 2013-07-03 | 常州华德机械有限公司 | Box closing connection structure for casting sand box |
| CN103586412B (en) * | 2013-11-11 | 2015-06-17 | 冀中能源邯郸矿业集团通方煤矿机械有限公司 | Method for casting ledges of middle troughs of scraper conveyer by V (vacuum) method |
| CN203737960U (en) * | 2014-02-24 | 2014-07-30 | 什邡永森机械有限公司 | Casting sand box |
| CN105397028A (en) * | 2015-12-07 | 2016-03-16 | 天津威尔朗科技有限公司 | Method for evaporative pattern monoblock casting for middle groove member of scraper conveyer |
| CN105689646A (en) * | 2016-04-22 | 2016-06-22 | 四川芙蓉集团宜宾嘉业机械制造有限责任公司 | Integral casting production technology for middle trough |
| CN205763649U (en) * | 2016-04-22 | 2016-12-07 | 四川芙蓉集团宜宾嘉业机械制造有限责任公司 | The Die Box that one piece casting uses |
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