CN108656419B - Mineral casting variable-temperature maintenance system and working method thereof - Google Patents
Mineral casting variable-temperature maintenance system and working method thereof Download PDFInfo
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- CN108656419B CN108656419B CN201810542077.XA CN201810542077A CN108656419B CN 108656419 B CN108656419 B CN 108656419B CN 201810542077 A CN201810542077 A CN 201810542077A CN 108656419 B CN108656419 B CN 108656419B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/02—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/22—Component parts, details or accessories; Auxiliary operations
- B29C39/26—Moulds or cores
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/22—Component parts, details or accessories; Auxiliary operations
- B29C39/38—Heating or cooling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/22—Component parts, details or accessories; Auxiliary operations
- B29C39/44—Measuring, controlling or regulating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention relates to a temperature-changing maintenance system of mineral castings and a working method thereof, belonging to the field of composite material manufacture, wherein a water circulation pipeline is arranged in a die, a first temperature sensor and a second temperature sensor are respectively arranged in the center and the periphery of the die, the first temperature sensor and the second temperature sensor can respectively detect the temperature in the center of a pouring space of the die and the periphery of the pouring space, and the temperature of the mineral castings is regulated under the control of a die temperature machine, so that the temperature-changing maintenance system is easy to build during production and processing, simple in structure and convenient to operate; according to the invention, through carrying out variable-temperature curing on the mineral casting product formed at room temperature, the internal residual stress is fully released, the internal interface is fully regrown, the interface bonding strength is improved, and the thermal expansion characteristic and the basic mechanical property of the mineral casting are improved, so that the time for accelerating curing for eliminating the residual stress is greatly shortened (shortened to 27 days), the production period is shortened, the mass production is facilitated, and the production cost is saved.
Description
Technical Field
The invention relates to a variable-temperature maintenance system for mineral castings and a working method thereof, and belongs to the technical field of composite materials.
Background
The foundation of engineering machinery is generally divided into four types of cast iron, mineral casting (polymer and/or active resin concrete), steel/welded structure (grouting/non-grouting) and natural stone (such as granite), and various materials have characteristics and no perfect structural material exists. With the continuous improvement of the technological level, consumers have higher demands on mechanical products, higher precision demands are put forward on manufacturing industry, a machine tool is used as a basic core of the manufacturing industry, and the problems of vibration, thermal deformation and the like of basic components such as a machine body, a stand column and the like of the machine tool can greatly influence the overall performance and the machining precision of the machine tool. Mineral castings have been widely accepted in the machine tool industry for more than 30 years as structural materials, because they have 10 times better shock absorption than conventional cast iron, ensure stability of machine tool accuracy under a large dynamic load, and improve workpiece surface machining quality by 20%, and can bring higher accuracy, better surface quality, longer tool service life in machining, for example, mineral castings are continually replacing conventional structural materials, and the key to rapid development is mineral casting, die set, and stable bonded structure. At present, mineral castings are widely used in a plurality of machine tool fields such as grinding machines, high-speed machining and the like. The mineral casting is a novel composite material with natural granite particles as aggregate and organic resin or polymer as binder, and then is filled into a female die of professional equipment for forming. Because of different technological processes and material performances of the traditional cast iron, the mineral cast iron can be used for casting various complex shapes which cannot be cast by the traditional cast iron, and the more complex shapes can be realized by a special mode of gluing the mineral cast iron, so that the ideal shapes are obtained.
The mineral casting also has excellent damping vibration attenuation performance, thermal stability, high corrosion resistance, environmental protection, better mechanical property and processing performance, and is suitable for manufacturing mechanical base parts such as bases and lathes of high-speed and precision machining tools, grinding machines, lasers, electronic, measuring, medical and semiconductor equipment and the like. In the curing process of the mineral castings, heat released by the reaction of the resin and the curing agent cannot be rapidly dissipated, so that the resin system and the aggregate system are simultaneously heated and expanded, and the curing residual stress is also stored in the mineral castings due to the large difference of the thermal expansion coefficients of the resin system and the aggregate system, so that the thermal expansion characteristics and the mechanical properties of the mineral castings are affected. Because the internal and external temperatures are suspended and removed greatly, cracks are easy to generate, and the time for automatically eliminating residual stress by cooling is long (about 30 days), for example, the temperature is placed in a temperature changing chamber, the temperature changing chamber is not convenient for large-scale production due to the influence of environmental conditions, and the cost consumption is high.
Disclosure of Invention
Aiming at the technical problems, the invention aims to provide a temperature-changing maintenance system for mineral castings, and simultaneously provides a working method of the temperature-changing maintenance system for mineral castings.
The mineral casting variable-temperature maintenance system comprises a die, wherein a casting space is formed inside the die, a circulating water pipe is arranged inside the casting space, a first temperature sensor is arranged in the center of the casting space, the first temperature sensor is also positioned inside a pipeline ring surrounded by the circulating water pipe, a second temperature sensor is arranged in the casting space between the circulating water pipe and the inner wall of the die, the first temperature sensor is connected with a first thermometer fixed on the die, the second temperature sensor is connected with a second thermometer fixed on the die, two ends of the circulating water pipe are respectively connected with a first connector and a second connector, and the first connector and the second connector penetrate through the die and are respectively detachably connected with a water inlet and a water outlet of an external die temperature machine through water pipes.
The pipeline ring surrounded by the circulating water pipe is rectangular or elliptical.
The circulating water pipe is one and is a plastic hose.
The first temperature sensor, the second temperature sensor and the circulating water pipe are suspended in the pouring space of the die through a lifting rope or a short rod connected with the die.
The temperature-changing curing method of the mineral castings comprises a heating curing stage and a cooling curing stage which are sequentially carried out in the curing stage of the mineral castings;
the temperature rising and maintaining stage is to regulate the water temperature in the circulating water pipe to rise gradually through a mold temperature machine, and ensure that the temperature displayed by the first temperature instrument is 0-10 ℃ higher than the temperature displayed by the second temperature instrument while rising;
the cooling and curing stage is to gradually reduce the water temperature in the circulating water pipe through a mold temperature machine, and ensure that the temperature displayed by the second thermometer is 0-10 ℃ lower than the temperature displayed by the first thermometer while cooling.
The invention relates to a mineral casting variable-temperature maintenance method, which specifically comprises the following steps:
(1) Cooling and molding: pouring a mould, cooling and forming at room temperature, and disassembling the mould;
(2) And (3) heating and curing: starting a mold temperature machine, preheating circulating water in the mold temperature machine to 60-65 ℃, then adjusting the mold temperature machine to heat the circulating water in a circulating water pipe to 80-85 ℃, and ensuring that the temperature displayed by a first temperature meter is 0-10 ℃ higher than the temperature displayed by a second temperature meter while heating;
(3) And (3) cooling and curing: the temperature of the circulating water in the circulating water pipe is reduced to 40-35 ℃ by adjusting the die temperature machine, and the temperature displayed by the second temperature instrument is ensured to be 0-10 ℃ lower than the temperature displayed by the first temperature instrument at the stage;
(4) And (3) naturally cooling: and closing the mold temperature machine, and naturally cooling to room temperature.
Preferably, in the step (2), the heating rate of the circulating water after preheating is 2.5 ℃/h, and the temperature is kept for 50h after the temperature is raised to 80-85 ℃.
Preferably, in the step (3), the cooling rate in the cooling maintenance stage is 5 ℃/1.5h, and the cooling time is 12-13.5h.
Preferably, the cooling molding time in the step (1) is 12-24 hours.
Compared with the prior art, the invention has the following beneficial effects.
According to the mineral casting variable-temperature maintenance system, the first temperature sensor and the second temperature sensor can respectively detect the temperature at the center of the pouring space of the die and the temperature at the periphery in the pouring space, and the temperature in the mineral casting can be regulated under the control of the die temperature machine, so that the mineral casting variable-temperature maintenance system is easy to build during production and processing, and is simple in structure and convenient to operate; according to the invention, through carrying out variable-temperature curing on the mineral casting product formed at room temperature, the internal residual stress is fully released, the internal interface is fully regrown, the interface bonding strength is improved, and the thermal expansion characteristic and the basic mechanical property of the mineral casting are improved, so that the time for accelerating curing for eliminating the residual stress is greatly shortened (shortened to 27 days), the production period is shortened, the mass production is facilitated, and the production cost is saved.
Drawings
FIG. 1 is a schematic diagram of a temperature-changing maintenance system for mineral castings.
In the figure: 1. the device comprises a second temperature sensor 2, a die 3, a first connector 4, a die temperature machine 5, a second connector 6, a first temperature sensor 7, a circulating water pipe 8, a first thermometer 9 and a second thermometer.
Detailed Description
The invention is further described below with reference to examples and figures of the specification.
The mineral casting variable-temperature maintenance system comprises a die 2, wherein a casting space is formed inside the die 2, a circulating water pipe 7 is arranged inside the casting space, a first temperature sensor 6 is arranged at the center in the casting space, the first temperature sensor 6 is also positioned inside a pipeline ring surrounded by the circulating water pipe 7, a second temperature sensor 1 is arranged in the casting space between the circulating water pipe 7 and the inner wall of the die 2, the first temperature sensor 6 is connected with a first temperature instrument 8 fixed on the die 2, the second temperature sensor 1 is connected with a second temperature instrument 9 fixed on the die 2, two ends of the circulating water pipe 7 are respectively connected with a first connector 3 and a second connector 5, and the first connector 3 and the second connector 5 penetrate through the die 2 and are respectively detachably connected with a water inlet and a water outlet of an external die temperature machine 4 through water pipes.
The pipeline ring surrounded by the circulating water pipe 7 is rectangular or elliptical.
The circulating water pipe 7 is one and is a plastic hose.
The first temperature sensor 6, the second temperature sensor 1 and the circulating water pipe 7 are suspended in the pouring space of the die 2 through a lifting rope or a short rod connected with the die 2.
Example 1
The mineral casting variable-temperature maintenance method specifically comprises the following steps:
before pouring the mineral castings, arranging a circulating water pipe 7, a first temperature sensor 6 and a second temperature sensor 1 in the die 2, pouring water into the circulating water pipe 7 in advance to ensure smooth pipelines, pouring the die 2 at room temperature for cooling and forming for 12 hours, removing the die 2 after cooling and forming, and respectively connecting a first connector 3 and a second connector 5 with a water inlet and a water outlet of a die temperature machine 4; starting the mold temperature machine 4 to preheat the temperature of the circulating water in the circulating water pipe 7 to 60 ℃, then adjusting the mold temperature machine 4 to heat the circulating water in the circulating water pipe 7 to 85 ℃ at a heating rate of 2.5 ℃/h, and preserving the heat for 50h, wherein the temperature displayed by the first temperature instrument 8 is ensured to be 0-10 ℃ higher than the temperature displayed by the second temperature instrument 9; then regulating the mold temperature machine 4 to cool the circulating water in the circulating water pipe 7 to 35 ℃ at a cooling rate of 2.5 ℃/h, wherein the temperature displayed by the second temperature instrument 9 is 0-10 ℃ lower than the temperature displayed by the first temperature instrument 8, and the cooling time is 12h; and closing the mold temperature machine 4, and naturally cooling to room temperature to finish the variable-temperature maintenance of the mineral castings.
Example 2
Before pouring the mineral castings, arranging a circulating water pipe 7, a first temperature sensor 6 and a second temperature sensor 1 in the die 2, pouring water into the circulating water pipe 7 in advance to ensure smooth pipelines, pouring the die 2 at room temperature for cooling and forming for 24 hours, removing the die 2 after cooling and forming, and respectively connecting a first connector 3 and a second connector 5 with a water inlet and a water outlet of a die temperature machine 4; starting the mold temperature machine 4 to preheat the temperature of the circulating water in the circulating water pipe 7 to 65 ℃, then adjusting the mold temperature machine 4 to heat the circulating water in the circulating water pipe 7 to 80 ℃ at a heating rate of 2.5 ℃/h, and preserving the heat for 50h, wherein the temperature displayed by the first temperature instrument 8 is ensured to be 0-10 ℃ higher than the temperature displayed by the second temperature instrument 9; then regulating the mold temperature machine 4 to cool the circulating water in the circulating water pipe 7 to 40 ℃ at a cooling rate of 2.5 ℃/h, wherein the temperature displayed by the second temperature instrument 9 is 0-10 ℃ lower than the temperature displayed by the first temperature instrument 8, and the cooling time is 12h; and closing the mold temperature machine 4, and naturally cooling to room temperature to finish the variable-temperature maintenance of the mineral castings.
Claims (7)
1. The utility model provides a mineral foundry goods alternating temperature maintenance system, includes mould (2), its characterized in that: a pouring space is formed inside the die (2), a circulating water pipe (7) is arranged inside the pouring space, a first temperature sensor (6) is arranged at the center in the pouring space, the first temperature sensor (6) is also positioned inside a pipeline ring surrounded by the circulating water pipe (7), a second temperature sensor (1) is arranged in the pouring space between the circulating water pipe (7) and the inner wall of the die (2), the first temperature sensor (6) is connected with a first thermometer (8) fixed on the die (2), the second temperature sensor (1) is connected with a second thermometer (9) fixed on the die (2), two ends of the circulating water pipe (7) are respectively connected with a first connector (3) and a second connector (5), and the first connector (3) and the second connector (5) penetrate through the die (2) and are respectively detachably connected with a water inlet and a water outlet of an external die temperature machine (4) through water pipes;
the pipeline ring surrounded by the circulating water pipe (7) is rectangular or elliptical;
the circulating water pipe (7) is one and is a plastic hose.
2. The mineral casting temperature swing maintenance system of claim 1, wherein: the first temperature sensor (6), the second temperature sensor (1) and the circulating water pipe (7) are suspended in the pouring space of the die (2) through a lifting rope or a short rod connected with the die (2).
3. A method for temperature-changing maintenance of mineral castings, which adopts the system for temperature-changing maintenance of mineral castings according to claim 1, and is characterized in that: the mineral casting curing stage comprises a heating curing stage and a cooling curing stage which are sequentially carried out;
the temperature rising and curing stage is to gradually rise the water temperature in the circulating water pipe (7) through the mold temperature machine (4), and ensure that the temperature displayed by the first temperature instrument (8) is 0-10 ℃ higher than the temperature displayed by the second temperature instrument (9) when the temperature is raised;
the cooling and curing stage is to gradually reduce the water temperature in the circulating water pipe (7) through the mold temperature machine (4), and ensure that the temperature displayed by the second temperature instrument (9) is 0-10 ℃ lower than the temperature displayed by the first temperature instrument (8) while cooling.
4. A method for temperature-variable curing of mineral castings according to claim 3, wherein: the method specifically comprises the following steps:
1) Cooling and molding: pouring the mould (2), cooling and forming at room temperature, and disassembling the mould (2);
2) And (3) heating and curing: starting a mould temperature machine (4), preheating circulating water in the mould temperature machine (4) to 60-65 ℃, then adjusting the mould temperature machine (4) to heat the circulating water in a circulating water pipe (7) to 80-85 ℃, and ensuring that the temperature displayed by a first temperature instrument (8) is 0-10 ℃ higher than the temperature displayed by a second temperature instrument (9) while heating;
3) And (3) cooling and curing: the temperature of the circulating water in the circulating water pipe (7) is reduced to 40-35 ℃ by the die temperature regulator (4), and the temperature displayed by the second temperature instrument (9) is ensured to be 0-10 ℃ lower than the temperature displayed by the first temperature instrument (8) at the stage;
4) And (3) naturally cooling: and closing the mold temperature machine (4), and naturally cooling to room temperature.
5. The method for temperature-variable curing of mineral castings according to claim 4, wherein: in the step 2), the heating rate of the circulating water after preheating is 2.5 ℃/h, and the temperature is kept for 50h after the temperature is raised to 80-85 ℃.
6. The method for temperature-variable curing of mineral castings according to claim 4, wherein: in the step 3), the cooling rate in the cooling maintenance stage is 5 ℃/1.5h, and the cooling time is 12-13.5h.
7. The method for temperature-variable curing of mineral castings according to claim 4, wherein: and step 1) cooling and forming for 12-24h.
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| JP2002240051A (en) * | 2001-02-16 | 2002-08-28 | Toshiba Corp | Method for manufacturing epoxy resin cast product |
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| BR122013024161B1 (en) * | 2005-10-28 | 2016-08-09 | Novelis Inc | method of casting metal continuously or semi-continuously, with direct cooling of an ingot made of a fusible metal, and machine for carrying out said method. |
| CN101713755B (en) * | 2009-12-22 | 2011-06-08 | 青建集团股份公司 | System and method for detecting solid strength of mass concrete |
| JP2013022835A (en) * | 2011-07-21 | 2013-02-04 | Mitsubishi Heavy Ind Ltd | Method and apparatus for producing at least two products including fiber-reinforced resin |
| CN103736965B (en) * | 2013-12-31 | 2015-11-25 | 广州市型腔模具制造有限公司 | The temperature-controlled process of magnesium alloy die casting mould |
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| CN208247275U (en) * | 2018-05-30 | 2018-12-18 | 山东蒂德精密机床有限公司 | Cast mineral alternating temperature curing system |
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| JP2002240051A (en) * | 2001-02-16 | 2002-08-28 | Toshiba Corp | Method for manufacturing epoxy resin cast product |
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