CN113751685A - Temperature control device for centrifugal casting and method thereof - Google Patents
Temperature control device for centrifugal casting and method thereof Download PDFInfo
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- CN113751685A CN113751685A CN202111064122.3A CN202111064122A CN113751685A CN 113751685 A CN113751685 A CN 113751685A CN 202111064122 A CN202111064122 A CN 202111064122A CN 113751685 A CN113751685 A CN 113751685A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D13/00—Centrifugal casting; Casting by using centrifugal force
- B22D13/12—Controlling, supervising, specially adapted to centrifugal casting, e.g. for safety reasons
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D13/00—Centrifugal casting; Casting by using centrifugal force
- B22D13/02—Centrifugal casting; Casting by using centrifugal force of elongated solid or hollow bodies, e.g. pipes, in moulds rotating around their longitudinal axis
- B22D13/023—Centrifugal casting; Casting by using centrifugal force of elongated solid or hollow bodies, e.g. pipes, in moulds rotating around their longitudinal axis the longitudinal axis being horizontal
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Abstract
The invention relates to a temperature control device for centrifugal casting and a method thereof. According to the method, the casting temperatures of the cylindrical surface, the side surface and the center are compared and calculated, and the distance between the heating coil and the outer wall of the mold is regulated and controlled by utilizing the temperature difference, so that the temperature control of centrifugal casting is realized, and the problem that the temperature difference between different casting metals and formed working layer parts and the temperature difference of the working layer are too large during casting of the composite roll is effectively solved. The invention realizes the temperature difference regulation and control of different cast metals, formed working layer parts and working layers during the casting of the composite roll, and can effectively regulate and control the cylindrical surface temperature difference and the edge temperature difference of the working layer of the roll; meanwhile, the temperature difference of the working layer of the roller is accurately regulated and controlled in the casting process, and the casting quality of the working layer of the roller is improved.
Description
Technical Field
The invention relates to the technical field of centrifugal casting temperature control, in particular to a temperature control device and method for centrifugal casting.
Background
The common composite roller is one with outer layer of high hardness wear resistant material and middle core of high strength and toughness material, such as grey iron. The composite roller working layer has higher hardness and wear resistance, and the middle core part has the advantages of better toughness, higher strength, fracture resistance and the like, so that the integrally cast roller made of single materials is completely replaced on some frames.
In order to ensure that the roller has better rolling performance and can have lower price, the roller is usually made of multiple layers of materials, wherein the outermost layer is a working layer, the working layer is usually made of expensive alloy due to the requirement of working hardness, the axle center part is usually made of cast iron with better toughness and low price, but the two parts are usually connected by adopting multiple layers of metal alloys for ensuring better associativity; at present, a composite roller is usually manufactured by a centrifugal composite casting method, the centrifugal composite casting method generally comprises the steps of producing a working layer by centrifugal casting, producing a connecting layer by centrifugal casting, and finally casting a core part, but because the metal solution of the connecting layer is different from the metal of the working layer, a large temperature difference possibly exists between the metal solution and the metal of the working layer, the cast working layer is broken due to the existence of the temperature difference, the quality of the roller is influenced, cracks can be well reduced only by reducing the integral temperature difference of the working layer in the casting process, most of the existing centrifugal casting temperature control devices adopt flame to burn the outer surface of a casting furnace for integral heating, the integral temperature of a casting in the casting process can be controlled at a higher level only by the mode, the integral temperature can not be well controlled when the metal solution with different temperatures is cast, and the casting time can be prolonged, the quality of the casting cannot be ensured, and particularly for the multilayer composite roller, the traditional flame burning temperature control method cannot meet the production requirement. Therefore, there is a need for a temperature control device and method for centrifugal casting to solve the above problems.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a temperature control device for centrifugal casting and a method thereof, in which a plurality of sets of temperature detection devices are used to measure the temperature change during casting, and the lateral heating device and the cylindrical heating device are controlled to perform data-based controllable heating on the corresponding portions according to the corresponding temperature relationship, so as to realize temperature difference control of centrifugal casting, and effectively solve the problem of excessive temperature difference between different cast metals and formed working layer portions and the working layer itself during casting of a composite roll.
The technical scheme adopted by the invention is as follows:
the invention provides a temperature control device for centrifugal casting, which comprises a casting device, a mould, a temperature detection device, a horizontal casting bracket, a side heating device and a cylindrical surface heating device, wherein the casting device comprises a casting frame, a horizontal casting frame, a side heating device and a cylindrical surface heating device; the casting device is arranged at one end of the mould and is communicated with the interior of the mould; the horizontal casting support is respectively connected below the left end and the right end of the die; the mold consists of an outer wall of the mold and an intermediate layer arranged inside the mold; the temperature detection devices are uniformly distributed below the middle layer; the cylindrical surface heating devices are uniformly distributed below the outer wall of the mold; the side heating devices are respectively arranged at the front side and the rear side of the outer wall of the die;
the casting device comprises a casting top box, a casting pipeline and a casting support; the casting top box is arranged at the top of the casting support; one end of the casting pipeline is communicated with the bottom of the casting top box, and the other end of the casting pipeline is communicated with the middle layer;
the temperature detection device comprises a temperature thermocouple and a wireless signal generator; the wireless signal generator is arranged at the bottom of the temperature thermocouple; the temperature thermocouple is attached to the bottom of the middle layer; the wireless signal generator is positioned inside the outer wall of the mold;
the side heating device comprises a supporting table plate, a propulsion motor, a transverse moving base, a side heating power supply, a side heating coil and a guide rail; the propulsion motor is arranged on one side of the upper surface of the supporting table plate; the guide rail is arranged on the other side of the upper surface of the supporting table plate; the bottom of the transverse moving base is connected with the guide rail in a sliding manner; the output shaft of the propulsion motor is connected with the transverse moving base; the side heating power supply is arranged above the transverse moving base; the side heating coil is connected to the top of the side heating power supply;
the cylindrical surface heating device comprises a lifting motor, a lifting base, a cylindrical surface heating power supply and a cylindrical surface heating coil; the lifting motor is longitudinally arranged, and the middle part of the lifting base is vertically connected with an output shaft of the lifting motor; the cylindrical surface heating power supply is arranged above the lifting base; the cylindrical heating coil is connected to the top of the cylindrical heating power supply.
Furthermore, the side heating coil adopts a concentric circular arc type coil structure.
Furthermore, the cylindrical heating coil adopts a juxtaposed arc coil structure.
A method for temperature control in centrifugal casting, said method comprising the steps of:
s1 centrifugal casting
Pouring molten metal with the casting temperature of T ℃ into a casting top box, flowing into a cavity of a mold through a casting pipeline, driving the intermediate layer to rotate by the outer wall of the mold, and uniformly condensing the molten metal on the inner surface of the intermediate layer under the action of centrifugal force to realize centrifugal casting of the composite roller;
s2, temperature detection
The temperature detection devices are distributed on the inner surface of the outer wall of the mold, three temperature detection devices are uniformly arranged on the same cross section of the outer wall of the mold, the temperature detection devices on the same cross section are in a group, n groups of temperature detection devices are uniformly arranged along the axial direction of the outer wall of the mold, three temperature detection devices are also uniformly arranged on two inner side surfaces of the outer wall of the mold respectively, the temperature measuring thermocouples are attached to the middle layer, the wireless signal generator is arranged below the temperature measuring thermocouples and is installed in the outer wall of the mold, when the temperature is measured, the temperature measured by the temperature measuring thermocouples is transmitted to the computer by the wireless signal generator, the temperature measured by the same group of temperature detection devices is averaged, and the temperature is recorded as { T (T) according to the group1,T2,…,Ti,…,TnWhere TiThe average temperature measured by the ith group of temperature detection devices is shown, and then the front group and the rear group of temperature are averaged, namely the average temperature of the middle point
Is recorded as
N-1 group, the casting temperature T being different from the mean temperature at the midpoint, i.e.
Is recorded as
Due to casting forming
Is always less than T, so
Not less than zero; for the average temperature measured by the temperature detection devices on the two inner side surfaces, the temperature is close to T1Temperature of the group is noted as T0Near TnTemperature of the group is noted as Tn+1Difference from the casting temperature T, respectively, is denoted as Δ T0，ΔTn+1；
S3 cylindrical surface temperature regulation
For temperature control in the radial direction, a cylinder heating device is arranged between each two groups of temperature detection devices, i.e.
Setting n-1 sets of cylindrical surface heating devices corresponding to the ith set of cylindrical surface heating devices, and recording the temperature difference range between the cast molten metal and the cylindrical surface of the working layer of the roll which is formed by casting and is not fractured as (0, delta t'), so that
Comparing with the delta t ', wherein the cylindrical surface heating device corresponding to the numerical value smaller than the delta t' does not carry out heating and temperature compensation, and the cylindrical surface heating device corresponding to the numerical value larger than the delta t 'carries out heating and temperature compensation on the cast cylindrical surface until the temperature is smaller than the delta t';
for the control of the temperature in the axial direction, will
The average calculation is carried out on the numerical values in (1) and the result is recorded as
Order to
Minus
The results are recorded as
For the
When the temperature of the corresponding cylindrical surface heating device is controlled in the radial direction, the distance between the cylindrical surface heating coil and the outer wall of the mold does not need to be adjusted, when the temperature of the corresponding cylindrical surface heating device is controlled in the radial direction, the distance between the cylindrical surface heating coil and the outer wall of the mold needs to be adjusted and controlled through a lifting motor when the temperature of the corresponding cylindrical surface heating device is required to be heated and compensated, the distance required to move by the cylindrical surface heating coil per unit centigrade is controlled to be delta R, and then the temperature of the corresponding cylindrical surface heating device is adjusted and controlled to be delta R
When the heating coil is larger than zero, the cylindrical heating coil moves towards the direction far away from the outer wall of the die
A distance between
When the temperature is less than zero, the cylindrical heating coil moves towards the direction close to the outer wall of the die
A distance between
Over cylinderWhen the heating coil moves the maximum distance D with the outer wall of the die, the moving distance of the cylindrical heating coil is D;
s4, side temperature control
Two side surfaces of the outer wall of the mould are respectively provided with a side heating device for T0The corresponding side heating device records the temperature difference range of the cast molten metal and the side of the roll working layer which is formed by casting and does not break as (0, delta T) when T-T is used as0When the temperature is less than delta t ', the corresponding side heating device does not work, when the temperature is more than delta t', the corresponding side heating device works, the moving distance of the side heating coil at each unit centigrade is controlled to be delta r, and when the side heating device works, the side heating coil is enabled to move
When Δ T0When the pressure is larger than zero, the propulsion motor drives the side heating coil to move delta T towards the direction far away from the side surface of the outer wall of the die0Δ r, when Δ T0When the temperature is less than zero, the side heating coil moves delta T towards the direction close to the side surface of the outer wall of the die0Δ r, when Δ T0When Δ r exceeds the maximum moving distance d between the side heating coil and the side surface of the outer wall of the mold, the moving distance of the side heating coil is d, and Tn+1Corresponding side heating device and the T0The corresponding side heating devices perform the same treatment.
Furthermore, the temperature detection devices in the same group are uniformly distributed on the same circumference, and three temperature detection devices are not limited to be arranged.
Furthermore, the temperature thermocouple is attached to the outer surface of the middle layer through a heat-conducting silicone compound; gaps among the temperature detection device, the middle layer and the outer wall of the mold are filled with heat-conducting silicone compounds; the wireless signal generator transmits the temperature measured by the temperature thermocouple and corresponding group information to the computer, and the computer performs grouping calculation on the temperature information according to the received groups.
Compared with the prior art, the invention has the following beneficial effects:
1. the device heats the side surface of the roller working layer in the casting process through the side surface heating device, heats the cylindrical surface of the roller working layer in the casting process through the cylindrical surface heating device, monitors the temperature of the working layer in the casting process in real time through a plurality of groups of temperature detection devices, and regulates and controls the side surface heating device and the cylindrical surface heating device according to the temperature relationship, thereby realizing the temperature difference regulation and control of different cast metals and formed working layer parts and the working layer per se during the casting of the composite roller, and effectively regulating and controlling the cylindrical surface temperature difference and the edge temperature difference of the roller working layer;
2. according to the method, the temperature data of the roller working layer in the casting process are monitored in real time through a plurality of groups of temperature detection devices, temperature change calculation is carried out according to the temperature data, and a set of regulation and control scheme of the side heating device and the cylindrical surface heating device to corresponding temperature areas is provided according to calculation and comparison results, so that the temperature difference of the roller working layer in the casting process is accurately regulated and controlled, and the casting quality of the roller working layer is improved.
Drawings
FIG. 1 is a schematic view of the overall structure of the apparatus of the present invention;
FIG. 2 is a schematic view of the partial cross-sectional structure of FIG. 1;
FIG. 3 is a schematic view of the side heating apparatus of FIG. 1;
FIG. 4 is a schematic view of the configuration of the cylinder heating apparatus of FIG. 1;
FIG. 5 is a schematic view of the structure of the temperature detecting device in FIG. 2;
FIG. 6 is a schematic flow chart of the operation of the method of the present invention.
Wherein, the reference numbers: 1-a casting device; 101-casting a top box; 102-a casting duct; 103-casting a bracket; 2-the outer wall of the mould; 3-a temperature detection device; 301-temperature thermocouple; 302-a wireless signal generator; 4-an intermediate layer; 5, horizontally casting a bracket; 6-side heating means; 601-supporting a table; 602-a propulsion motor; 603-laterally moving the base; 604-side heating power supply; 605-side heating coil; 606-a guide rail; 7-cylinder heating means; 701-a lifting motor; 702-a lifting base; 703-cylinder heating power supply; 704-cylindrical heating coil.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
It should be noted that in the description of the present invention, the terms "upper", "lower", "top", "bottom", "one side", "the other side", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not mean that a device or an element must have a specific orientation, be configured and operated in a specific orientation.
Referring to fig. 1 to 5, a detailed structure of an embodiment of a temperature control apparatus for centrifugal casting according to the present invention is shown. The device comprises a casting device 1, a mould, a temperature detection device 3, a horizontal casting bracket 5, a side heating device 6 and a cylindrical surface heating device 7; the casting device 1 is arranged at one end of the mould and is communicated with the interior of the mould; the horizontal casting support 5 is respectively connected below the left end and the right end of the die; the mould consists of an outer wall 2 of the mould and an intermediate layer 4 arranged inside the mould; the temperature detection devices 3 are uniformly distributed below the middle layer 4; the cylindrical surface heating devices 7 are uniformly distributed below the outer wall 2 of the mold; the side heating devices 6 are respectively arranged below the front side and the rear side of the outer wall 2 of the mold.
The casting device 1 comprises a casting top box 101, a casting pipeline 102 and a casting support 103; the casting top box 101 is arranged at the top of the casting support 103; one end of the casting pipeline 102 is communicated with the bottom of the casting top box 101, and the other end of the casting pipeline is communicated with the inner cavity of the middle layer 4.
The temperature detection device 3 comprises a temperature thermocouple 301 and a wireless signal generator 302; the wireless signal generator 302 is arranged at the bottom of the temperature thermocouple 301; the temperature thermocouple 301 and the wireless signal generator 302 are both positioned in the outer wall 2 of the mold, and the temperature thermocouple 301 is attached to the bottom of the middle layer 4.
The side heating device 6 comprises a supporting table 601, a propulsion motor 602, a transverse moving base 603, a side heating power supply 604, a side heating coil 605 and a guide rail 606; the propulsion motor 602 is arranged on one side of the upper surface of the supporting table 601; the guide rail 606 is arranged on the other side of the upper surface of the supporting table 601; the bottom of the transverse moving base 603 is connected with a guide rail 606 in a sliding manner; the output shaft of the propulsion motor 602 is fixedly connected with the transverse moving base 603; the side heating power supply 604 is arranged above the transverse moving base 603; the side heating coil 605 is connected to the top of the side heating power supply 604 and is powered and heated by the side heating power supply 604; the pushing motor 602 can push the laterally moving base 603, so that the laterally moving base 603 can drive the lateral heating power supply 604 and the lateral heating coil 605 to move forward or backward along the guide rail 606; in this embodiment, the side heating coil 605 is a vertical concentric circular coil structure.
The cylindrical surface heating device 7 comprises a lifting motor 701, a lifting base 702, a cylindrical surface heating power supply 703 and a cylindrical surface heating coil 704; the lifting motor 701 is longitudinally arranged, and the middle part of the lifting base 702 is vertically and fixedly connected with an output shaft of the lifting motor 701; the cylindrical surface heating power source 703 is arranged above the lifting base 702; the cylindrical heating coil 704 is connected to the top of the cylindrical heating power source 703 and is powered and heated by the cylindrical heating power source 703; the lifting motor 701 can push the lifting base 702, so that the lifting base 702 can drive the cylindrical surface heating power source 703 and the cylindrical surface heating coil 704 to vertically lift; in this embodiment, the cylindrical heating coil 704 has a laterally juxtaposed circular arc coil structure.
A method for temperature control in centrifugal casting, said method comprising the steps of:
s1 centrifugal casting
Pouring molten metal with the casting temperature of T ℃ into a casting top box, flowing into a cavity of a mold through a casting pipeline, driving the intermediate layer to rotate by the outer wall of the mold, and uniformly condensing the molten metal on the inner surface of the intermediate layer under the action of centrifugal force to realize centrifugal casting of the composite roller;
s2, temperature detection
The temperature detection devices 3 are distributed on the inner surface of the outer wall 2 of the mold, three temperature detection devices 3 are uniformly arranged on the same section of the outer wall 2 of the mold, the temperature detection devices 3 on the same section are in one group, and n groups of temperature detection devices 3 are uniformly arranged along the axial direction of the outer wall 2 of the mold; the temperature detection devices 3 in different groups are not necessarily arranged on the same bus, but the temperature detection devices 3 in the same group are required to be uniformly distributed on the same circumference and are not limited to be provided with three temperature detection devices; the inner side surfaces of the front side and the rear side of the outer wall 2 of the mold are respectively and uniformly provided with three temperature detection devices 3, a temperature thermocouple 301 is attached to the middle layer 4, and a wireless signal generator 302 is arranged below the temperature thermocouple 301 and is arranged in the outer wall 2 of the mold; the temperature thermocouple 301 is attached to the outer surface of the middle layer 4 through a heat-conducting silicone compound; gaps between the temperature detection device 3 and the middle layer 4 and between the temperature detection device and the outer wall 2 of the mold are filled with heat-conducting silicone compounds; the wireless signal generator 302 transmits the temperature measured by the temperature thermocouple 301 and corresponding group information to the computer, and the computer performs grouping calculation on the temperature information according to the received groups; when measuring the temperature, the wireless signal generator 302 transmits the temperature measured by the temperature thermocouple to the computer, averages the temperatures measured by the same group of temperature detection devices 3, and records the temperature as { T } according to the group1,T2，…，Ti，…，TnWhere TiThe average temperature measured by the i-th group of temperature detection devices 3 is shown, and then the temperatures of the front and rear groups are averaged, namely the average temperature of the middle point
Is recorded as
N-1 group, the casting temperature T being different from the mean temperature at the midpoint, i.e.
Is recorded as
Due to casting forming
Is always less than T, so
Not less than zero; the average temperature measured by the two inner side surface temperature detection devices 3 is close to T1Temperature of the group is noted as T0Near TnTemperature of the group is noted as Tn+1Difference from the casting temperature T, respectively, is denoted as Δ T0，ΔTn+1；
S3 cylindrical surface temperature regulation
For temperature control in the radial direction, a cylinder heating device 7 is arranged between each two groups of temperature detection devices 3, i.e.
Setting n-1 sets of cylindrical surface heating devices corresponding to the ith set of cylindrical surface heating devices, and recording the temperature difference range between the cast molten metal and the cylindrical surface of the working layer of the roll which is formed by casting and is not fractured as (0, delta t'), so that
Comparing with the delta t ', wherein the cylindrical surface heating device 7 corresponding to the numerical value smaller than the delta t' does not carry out heating and temperature compensation, and the cylindrical surface heating device 7 corresponding to the numerical value larger than the delta t 'carries out heating and temperature compensation on the cast cylindrical surface until the temperature is smaller than the delta t';
for the control of the temperature in the axial direction, will
The average calculation is carried out on the numerical values in (1) and the result is recorded as
Order to
Minus
The results are recorded as
For the
When the temperature of the corresponding cylindrical heating device 7 is controlled in the radial direction without heating and temperature compensation, the distance between the cylindrical heating coil 704 and the outer wall 2 of the mold does not need to be adjusted during the temperature control in the axial direction, when the temperature of the corresponding cylindrical heating device 7 is controlled in the radial direction and needs to be heated and temperature compensated, the distance between the cylindrical heating coil 704 and the outer wall 2 of the mold needs to be adjusted and controlled by the lifting motor 701 during the temperature control in the axial direction, the distance which the cylindrical heating coil needs to move per unit centigrade is controlled to be delta R, and then the distance which the cylindrical heating coil needs to move per unit centigrade is controlled to be delta R
When the temperature is larger than zero, the cylindrical heating coil 704 moves towards the direction away from the outer wall 2 of the die
A distance between
When the temperature is less than zero, the cylindrical heating coil 704 moves towards the direction close to the outer wall 2 of the mould
A distance between
When the maximum moving distance D between the cylindrical heating coil 704 and the outer wall 2 of the mold is exceeded, the moving distance of the cylindrical heating coil 704 is D;
s4, side temperature control
The two side surfaces of the outer wall 2 of the mould are respectively provided with a side heating device 6 for T0The corresponding side heating device records the temperature difference range of the cast molten metal and the side of the roll working layer which is formed by casting and does not break as (0, delta t)T-T0When the temperature is less than delta t ', the corresponding side heating device 6 does not work, when the temperature is more than delta t', the corresponding side heating device 6 works, the distance between the side heating coils 605 which need to move in each unit of centigrade is controlled to be delta r, and when the side heating device 6 works, the side heating devices are enabled to work
When Δ T0When the pressure is larger than zero, the propulsion motor 602 drives the side heating coil 605 to move delta T in the direction away from the side surface of the outer wall 2 of the mold0Δ r, when Δ T0When the temperature is less than zero, the side heating coil 605 moves to a direction close to the side surface of the outer wall 2 of the mold by Delta T0Δ r, when Δ T0When Δ r exceeds the maximum moving distance d between the side heating coil 605 and the side surface of the outer wall 2 of the mold, the moving distance d of the side heating coil 605 is Tn+1Corresponding side heating device 6 and the above T0The corresponding side heating means 6 are treated the same.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (6)
1. Centrifugal casting's temperature control device, its characterized in that: the device comprises a casting device, a mould, a temperature detection device, a horizontal casting bracket, a side heating device and a cylindrical surface heating device; the casting device is arranged at one end of the mould and is communicated with the interior of the mould; the horizontal casting support is respectively connected below the left end and the right end of the die; the mold consists of an outer wall of the mold and an intermediate layer arranged inside the mold; the temperature detection devices are uniformly distributed below the middle layer; the cylindrical surface heating devices are uniformly distributed below the outer wall of the mold; the side heating devices are respectively arranged at the front side and the rear side of the outer wall of the die;
the casting device comprises a casting top box, a casting pipeline and a casting support; the casting top box is arranged at the top of the casting support; one end of the casting pipeline is communicated with the bottom of the casting top box, and the other end of the casting pipeline is communicated with the middle layer;
the temperature detection device comprises a temperature thermocouple and a wireless signal generator; the wireless signal generator is arranged at the bottom of the temperature thermocouple; the temperature thermocouple is attached to the bottom of the middle layer; the wireless signal generator is positioned inside the outer wall of the mold;
the side heating device comprises a supporting table plate, a propulsion motor, a transverse moving base, a side heating power supply, a side heating coil and a guide rail; the propulsion motor is arranged on one side of the upper surface of the supporting table plate; the guide rail is arranged on the other side of the upper surface of the supporting table plate; the bottom of the transverse moving base is connected with the guide rail in a sliding manner; the output shaft of the propulsion motor is connected with the transverse moving base; the side heating power supply is arranged above the transverse moving base; the side heating coil is connected to the top of the side heating power supply;
the cylindrical surface heating device comprises a lifting motor, a lifting base, a cylindrical surface heating power supply and a cylindrical surface heating coil; the lifting motor is longitudinally arranged, and the middle part of the lifting base is vertically connected with an output shaft of the lifting motor; the cylindrical surface heating power supply is arranged above the lifting base; the cylindrical heating coil is connected to the top of the cylindrical heating power supply.
2. The temperature control apparatus for centrifugal casting according to claim 1, characterized in that: the side heating coil adopts a concentric circular arc type coil structure.
3. The temperature control apparatus for centrifugal casting according to claim 1, characterized in that: the cylindrical heating coil adopts a juxtaposed arc coil structure.
4. The method for controlling the temperature in centrifugal casting according to claim 1, comprising the steps of:
s1 centrifugal casting
Pouring molten metal with the casting temperature of T ℃ into a casting top box, flowing into a cavity of a mold through a casting pipeline, driving the intermediate layer to rotate by the outer wall of the mold, and uniformly condensing the molten metal on the inner surface of the intermediate layer under the action of centrifugal force to realize centrifugal casting of the composite roller;
s2, temperature detection
The temperature detection devices are distributed on the inner surface of the outer wall of the mold, three temperature detection devices are uniformly arranged on the same cross section of the outer wall of the mold, the temperature detection devices on the same cross section are in a group, n groups of temperature detection devices are uniformly arranged along the axial direction of the outer wall of the mold, three temperature detection devices are also uniformly arranged on two inner side surfaces of the outer wall of the mold respectively, the temperature measuring thermocouples are attached to the middle layer, the wireless signal generator is arranged below the temperature measuring thermocouples and is installed in the outer wall of the mold, when the temperature is measured, the temperature measured by the temperature measuring thermocouples is transmitted to the computer by the wireless signal generator, the temperature measured by the same group of temperature detection devices is averaged, and the temperature is recorded as { T (T) according to the group1,T2,…,Ti,…,TnWhere TiThe average temperature measured by the ith group of temperature detection devices is shown, and then the front group and the rear group of temperature are averaged, namely the average temperature of the middle point
Is recorded as
N-1 group, the casting temperature T being different from the mean temperature at the midpoint, i.e.
Is recorded as
Due to casting forming
Is always less than T, so
Not less than zero; for the average temperature measured by the temperature detection devices on the two inner side surfaces, the temperature is close to T1Temperature of the group is noted as T0Near TnTemperature of the group is noted as Tn+1Difference from the casting temperature T, respectively, is denoted as Δ T0，ΔTn+1；
S3 cylindrical surface temperature regulation
For temperature control in the radial direction, a cylinder heating device is arranged between each two groups of temperature detection devices, i.e.
Setting n-1 sets of cylindrical surface heating devices corresponding to the ith set of cylindrical surface heating devices, and recording the temperature difference range between the cast molten metal and the cylindrical surface of the working layer of the roll which is formed by casting and is not fractured as (0, delta t'), so that
Comparing with the delta t ', wherein the cylindrical surface heating device corresponding to the numerical value smaller than the delta t' does not carry out heating and temperature compensation, and the cylindrical surface heating device corresponding to the numerical value larger than the delta t 'carries out heating and temperature compensation on the cast cylindrical surface until the temperature is smaller than the delta t';
for the control of the temperature in the axial direction, will
The average calculation is carried out on the numerical values in (1) and the result is recorded as
Order to
Minus
The results are recorded as
For the
When the temperature of the corresponding cylindrical surface heating device is controlled in the radial direction, the distance between the cylindrical surface heating coil and the outer wall of the mold does not need to be adjusted, when the temperature of the corresponding cylindrical surface heating device is controlled in the radial direction, the distance between the cylindrical surface heating coil and the outer wall of the mold needs to be adjusted and controlled through a lifting motor when the temperature of the corresponding cylindrical surface heating device is required to be heated and compensated, the distance required to move by the cylindrical surface heating coil per unit centigrade is controlled to be delta R, and then the temperature of the corresponding cylindrical surface heating device is adjusted and controlled to be delta R
When the heating coil is larger than zero, the cylindrical heating coil moves towards the direction far away from the outer wall of the die
A distance between
When the temperature is less than zero, the cylindrical heating coil moves towards the direction close to the outer wall of the die
A distance between
When the maximum moving distance D between the cylindrical heating coil and the outer wall of the mold is exceeded, the moving distance of the cylindrical heating coil is D;
s4, side temperature control
Two side surfaces of the outer wall of the mould are respectively provided with a side heating device for T0The corresponding side heating device records the temperature difference range of the cast molten metal and the side of the roll working layer which is formed by casting and does not break as (0, delta T) when T-T is used as0When the temperature is less than delta t ', the corresponding side heating device does not work, when the temperature is more than delta t', the corresponding side heating device works, and the time that the side heating coil needs to move per unit centigrade is controlledThe distance is delta r, when the side heating device works, the
When Δ T0When the pressure is larger than zero, the propulsion motor drives the side heating coil to move delta T towards the direction far away from the side surface of the outer wall of the die0Δ r, when Δ T0When the temperature is less than zero, the side heating coil moves delta T towards the direction close to the side surface of the outer wall of the die0Δ r, when Δ T0When Δ r exceeds the maximum moving distance d between the side heating coil and the side surface of the outer wall of the mold, the moving distance of the side heating coil is d, and Tn+1Corresponding side heating device and the T0The corresponding side heating devices perform the same treatment.
5. The temperature control method of centrifugal casting according to claim 4, characterized in that: the temperature detection devices in the same group are uniformly distributed on the same circumference, and three temperature detection devices are not limited to be arranged.
6. The temperature control method of centrifugal casting according to claim 4, characterized in that: the temperature thermocouple is attached to the outer surface of the middle layer through a heat-conducting silicone compound; gaps among the temperature detection device, the middle layer and the outer wall of the mold are filled with heat-conducting silicone compounds; the wireless signal generator transmits the temperature measured by the temperature thermocouple and corresponding group information to the computer, and the computer performs grouping calculation on the temperature information according to the received groups.
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