SU1277070A1 - System for controlling temperature of moulds - Google Patents

Abstract

The invention relates to the field of foundry, in particular, to systems of thermoregulation of metal molds and metal forming elements. The aim of the invention is to simplify the design, reduce the number of heat exchange cavities of the casting mold, h, h; h ;; s reliability and economically control the temperature of the casting mold, and expand the control range. The mold temperature control system contains sources of coolant, gaseous, and gas-liquid coolants that are connected to the corresponding circulation circuits formed by pneumohydraulic channels, heat exchange cavities of the casting molds, temperature sensors of the casting molds and heat-transfer fluid, connected to the control unit for actuating mechanisms for supplying liquid, gaseous, gas-liquid heat (/) carriers. The circuits of the circulation of liquid, gaseous, gas lidkostnoy heat carrier. soybean; ikeny between each other heat exchangers 1o.1Just and molds and pneumogues; 111 channels through intermediate eMKOcreii into the system of vessels that are connected to mec. 1 3, p. f-ly, 6 ill. YU

Description

The invention relates to foundry, in particular, to systems for thermoregulating metal molds and metal forming elements.

The aim of the invention is to simplify the design and reduce the number of heat exchange cavities of the mold, increase the reliability and economy of temperature control of the mold, and expand the control range.

FIG. Figure 1 shows a schematic diagram of a system for regulating the temperature of casting molds, liquid heat exchange with a casting mold; in fig. 2 - the same, gas-liquid heat exchange mode with a casting mold; in fig. 3 - the same, the mode of gas heat exchange with the mold; in fig. 4-6 - the location of the communicating vessels at different pressures in them.

The temperature control system of the casting molds contains forming walls and 2 molds, actuators-valves Zi 4, pneumo-hydraulic channels 5-7 for supplying gaseous heat transfer fluid, heat exchange cavities 8 and 9 of the molds in which replacement or mixing of heat-transfer media occurs, pneumo-hydraulic channels 10 and 11 for removal liquid heat carrier (mode I, fig. 1), gas-liquid heat carrier (mode 11, fig. 2) and supply of gaseous heat carrier (mode III, fig. 3) from heat exchange cavities 8 and 9 (or to heat exchange cavities), U-o The blister tube 12, one end 13 of which is lowered into the first intermediate capacitance 14 with a gap relative to its bottom and has side openings that are pneumo-hydraulic channels 10 and 11 for connecting the tube 12 with heat exchange cavities 8 and 9 in their upper part, the other end of U- tube 12 is connected to the valve valve body 15, with holes 16 in the case for communication with atmospheric air, a float 17 is located inside the case to block the holes 16 when a heat carrier gas is supplied to the case 15, and a central th hole 18 and the housing 15 - opening 19 connected to pnevmogidrokanalom 7, wherein the diameter of the hole 18 should

five

to be less than the diameter of the hole 19, intermediate tank 14, which serves to equalize the pressures at levels 20 and 21 (Fig. 3), respectively, in the heat exchange cavities 8 and 9 and at the end 13 of the i-shaped tube 12 during heat exchange of the mold in mode III ( Fig. 3), with DN2 and H2, pneumatic channel 22 for draining the heat-transfer fluid from the first intermediate tank 14 through the pneumatic-hydraulic channel 23 to the second intermediate tank 24, in which sensors 25 and 26 and the monitor 27 are placed

5 extreme (upper 28 and lower 29) positions of the liquid level in the tank 24 and 30, channel for giving the command from the device 27 to switch on (off) the pump 31, pneumatic hydraulic channels 32 and 33

0 for taking liquid from tank 24 and feeding it to tank 34, connected by a pneumohydraulic channel 35 to a third intermediate tank: 36, in which a valve (stopper) 37 is installed, rocker 38, float 39 of level regulator 40 of liquid in tank 36. Tube 41 serves to communicate the tank 36 with atmospheric air (pressure), pneumatic and hydraulic channels 42 and 43 for supplying coolant fluid to the intermediate 44 and 45 heat exchange cavities of the mold, the system includes housings 46 and 47 in which heat-exchange cavities 44 and 8 are made,

5 45 and 9, partitions 48 and 49, temperature sensor 50 (thermocouple) in the wall 1 of the mold, temperature sensor 51 (thermocouple) in the casting 52, control unit 53 in manual or automatic modes (there can be mini-computers, carriers control programs (algorithms), potentiometers, feedback devices, etc.), control channels 54 and 55 valves 3 and 4, hydraulic channels 56 for supplying gaseous heat carrier I, for example compressed air from a central main 57). In FIGS. 1-6, the following notation is adopted: 20 — level of partitions 48 and 49; 58 is the level of end 13 to create a hydrostatic column DYZ, which in the case of its positive value (Fig. 3 and 4) ensures complete extraction of fluid from cavities 8 and 9 in cavity 44 and 45 at level 20 (H40-H20-H59-H21 ) and the output of the gaseous coolant through the liquid in po0

0

five

0

3

x and 44, 45, pneumatic channels 42 and 43, tank 36 and tube 41 to the atmosphere, and with a negative dNZ value (FIG. 5) the coolant gas exits through the end 13 into the first intermediate tank 14 and then through the liquid to the atmosphere through the level of their separation 59; 60 - the level of liquid in the tank 34.

The temperature control system of the casting molds works in the following way.

The temperature of the mold is controlled by feedback from the control unit 53 by switching from one heat exchange mode to another. FIG. 1 shows the operation of the system in the form of liquid heat exchange. Valves 3 and 4 are closed. Heat exchanging fluid circulates in the system. From the tank 36, the liquid through 42 and 43 enters the cavities 44 and 45, then through the gaps formed by the partitions 48 and 49 and the walls of the housing 46 and 47, it enters the heat exchange cavities 8 and 9, cooling (or heating) the walls of the metal mold 1 and 2 Then the fluid through the pneumatic channels 10 and 11 enters the tube 12 and its end 13 (the tube 12 in its upper part forms a U-shaped part, communicating through the openings 16 of the valve 15 with atmospheric pressure, the openings are open), and from it enters the container 14 then surplus incoming liquid through 22 and 23 dropping When the upper level of the liquid 28 is reached, the sensor 25 is triggered, which gives a signal to the registering device of the device 27, the controls of which include the pump 31, When the liquid in the tank 24 drops to the level 29, the sensor 26 and the device 27 are activated by the control The organ turns off the pump 31. During operation, the pump 31 via channel 33 pumps the liquid into the container 34, and through channel 35 it enters the container 36. Thus, a closed automated cycle of heat exchange of the metal mold with the liquid is organized.

Fig, 2 shows the operation of the system in the mode of gas-liquid heat exchange with the casting mold. Valve 3 is open, valve 4 is closed. A gas-liquid mixture circulates in cavities 8 and 9.

770704

which through channels 10 and 11 enters the tubes 12 and its end 13, disintegrating into gas and liquid. Via tube 12, the gas through valve 15 is removed 5 to the atmosphere, and the fluid through channels 13, 22 and 23 enters the tank 24, where the final separation of the liquid from the gas occurs. This mode allows both manual and automatic regulation of the gas supply to the heat exchange cavities of casting molds. FIG. 2 also shows the operation of the system without devices 24-34, for example, when used as a liquid

5 coolant water from the shop line.

Fig, 3 shows the operation of the system in the mode of gas heat exchange mold. Valve 4 is open, valve 3

0 blocked. Compressed gas, coming from line 57 through the pneumatic and hydraulic channel 7, lifts the float 17 (with the holes 16 closed and the connection of the housing 15 with the atmosphere is stopped),

5 then through the opening 18 in the float and the tube 12, the pneumo-hydraulic channels 10 and 11 enters the cavities 8 and 9 and the end 13 of the tube 12 at level 21, and in the cavities 8 and 9 at level 20 it sets the AZ

0 pressure equality .J

R, 3) compressed gas and hydrostyle TfC IO to

pressure of the liquid column (DN2 + H2), since the incoming gas portions pass through

5, the fluid located in cavities 44 and 45, channels 42 and 43 and tank 36, and then removed to the atmosphere through tube 41. The end 13 of tube 12 is lowered below level 21 to a height of

0 level 58, which prevents gas

escape to atmosphere through vessel 14, which communicates with the atmosphere. This case is shown in FIG. 3 and FIG. 4. If in the design the height of the LSL is 5filled with a negative, t, p. level 58 is located ALL 2, as shown in FIG. 5, then the moving gas escapes into the atmosphere through the liquid of the container 14. In this case, the gas

0 displaces the liquid in the heat exchange cavities 8 and 9 not completely, which can be used to organize differentiable cooling (heating) with gas and liquid upper

5 and the lower parts of the walls 1 and 2 of the mold. Such a cooling mode can be organized without the release of gas into the atmosphere (FIG. 6). In these modes

Circulation of fluid in the system is suspended, as the level of fluid 40 in the tank 36 reaches its highest possible position, the float 39 floats up and through the lever 38 the stopper 37 blocks the flow of fluid from the tank 34. The tank 34 is calculated so that it does not overflow when it reaches the tank 24 of the liquid level 29, after which the pump 31 is automatically shut off.

The system can be designed so that between the hydrostatic pressure of the liquid heat transfer medium at the bottom of the heat exchange cavities 8 and 9, 44 and 45 of the mold P at level 20, the hydrostatic pressure in tank 14 with liquid P | level 58 end of the inverted U-shaped tube 12 and the pressure of compressed gas in the channel 7. one of the following relationships was performed:

  (fig-)

   , (Fig. 5)

  CP .- (6)

When alternating heat-exchange media in the system for regulating the temperature of the mold, heating of the heat-carrying medium from additional sources of heat and / or cooling of coolers in special devices is excluded.

Claims (2)

The invention relates to foundry, in particular, to systems for thermoregulating metal molds and metal forming elements. The aim of the invention is to simplify the design and reduce the number of heat exchange cavities of the mold, increase the reliability and economy of temperature control of the mold, and expand the control range. FIG. Figure 1 shows a schematic diagram of a system for regulating the temperature of casting molds, liquid heat exchange with a casting mold; in fig. 2 - the same, gas-liquid heat exchange mode with a casting mold; in fig. 3 - the same, the mode of gas heat exchange with the mold; in fig. 4 - 6 - location of the communicating vessels at different pressures in them. The temperature control system of the casting molds contains forming walls and 2 molds, actuators-valves Zi 4, pneumo-hydraulic channels 5-7 for supplying gaseous heat transfer fluid, heat exchange cavities 8 and 9 of the molds in which replacement or mixing of heat-transfer media occurs, pneumo-hydraulic channels 10 and 11 for removal liquid heat carrier (mode I, fig. 1), gas-liquid heat carrier (mode 11, fig. 2) and supply of gaseous heat carrier (mode III, fig. 3) from heat exchange cavities 8 and 9 (or to heat exchange cavities), U-o The blister tube 12, one end 13 of which is lowered into the first intermediate capacitance 14 with a gap relative to its bottom and has side openings that are pneumo-hydraulic channels 10 and 11 for connecting the tube 12 with heat exchange cavities 8 and 9 in their upper part, the other end of U- shaped tube 12 is connected to the valve valve body 15, with holes 16 in the case for communication with atmospheric air, a float 17 is located inside the case to block the holes 16 when the heat carrier gas is supplied to the case 15, and a central valve is made in the float th hole 18 and the housing 15 - opening 19 connected to pnevmogidrokanalom 7, wherein the diameter of the holes 18 must be smaller than the diameter of the holes 19, intermediate vessel 14, which serves to equalize the pressures on level meters 20 and 21 (FIG. C) respectively in the heat exchange cavities 8 and 9 and at the end of the 13 and the V-shaped tube 12 during heat exchange of the mold in mode III (Fig. 3), with DN2 and H2, pneumatic channel 22 for draining the heat-transfer fluid from the first intermediate tank 14 through the pneumatic-hydraulic channel 23 into the second intermediate tank 24, in which the sensors 25 and 26 and the device 27 control the extreme (upper 28 and lower 29) positions of the liquid level in the tank 24 and 30, the channel for giving the command from the device 27 to switch on (off) the pump 31, the pneumo-hydraulic channels 32 and 33 for collecting liquid from tank 24 and under chi it in a tank 34 connected by a pneumohydraulic channel 35 with a third intermediate tank: 36, in which a valve (plug) 37 is installed, a yoke 38, a float 39 of the level regulator 40 of the liquid in the tank 36. The tube 41 is used to communicate the tank 36 with atmospheric air (pressure) pneumatic channels 42 and 43 for supplying heat carrier fluid to intermediate 44 and 45 heat exchange cavities of the mold, the system includes housings 46 and 47 in which heat-exchange cavities 44 and 8, 45 and 9, partitions 48 and 49, temperature sensor 50 are made (thermocouple) in the wall 1 of the foundry pho we, the temperature sensor 51 (thermocouple) in the casting 52, the control unit 53 in manual or automatic modes (here can be located mini-computers, control program (algorithm) carriers, potentiometers, feedback devices, etc.), control channels 54 and 55 valves 3 and 4, knevmogidrokanaly 56 for supplying gaseous coolant I, for example compressed air from the central main 57). In Fig. 16, the following notation is accepted: 20 partition walls 48 and 49; 58 level of end 13 to create a hydrostatic column DYZ, which in the case of its positive value (Fig. 3 and 4) ensures complete displacement of fluid from cavities 8 and 9 in cavity 44 and 45 at level 20 (Н40Н20-Н59-Н21) and the output of gaseous the coolant through the liquid in po3 of holes 44 and 45, the pneumatic channels 42 and 43, the tank 36 and the tube 41 into the atmosphere, and with a negative dNZ value (FIG. 5) the coolant gas exits through the end 13 into the first intermediate tank 14 and then through the liquid to the atmosphere through the level of their section 59; 60 — The liquid level in the vessel 34. The temperature control system of the casting molds operates as follows. The temperature of the mold is controlled by feedback from the control unit 53 by switching from one heat exchange mode to another. FIG. 1 demonstration of system operation in the form of liquid heat exchange. Valves 3 and 4 are closed. Heat exchanging fluid circulates in the system. From the tank 36, the liquid through 42 and 43 enters the cavities 44 and 45, then through the gaps formed by the partitions 48 and 49 and the walls of the housing 46 and 47, it enters the heat exchange cavities 8 and 9, cooling (or heating) the walls of the metal mold 1 and 2 Then the fluid through the pneumatic channels 10 and 11 enters the tube 12 and its end 13 (the tube 12 in its upper part forms a U-shaped part, communicating through the openings 16 of the valve 15 with atmospheric pressure, the openings are open), and from it enters the container 14 then surplus flowing liquid through 22 and 23 sbra syv When the upper level of the liquid 28 is reached, the sensor 25 is triggered, which gives a signal to the registering device of the device 27, the controls of which include the pump 31, When the liquid in the tank 24 drops to the level 29, the sensor 26 and the device 27 are activated by the control The organ turns off the pump 31. During operation, the pump 31 via channel 33 pumps liquid into container 34, and through channel 35 it enters container 36. Thus, a closed automated cycle of heat exchange between the metal mold and the liquid is organized. Fig, 2 shows the operation of the system in the mode of gas-liquid heat exchange with the casting mold. Valve 3 is open, valve 4 is closed. A gas-liquid mixture circulates in cavities 8 and 9. 704 which through channels 10 and 11 enters the tubes 12 and its end 13, disintegrating into gas and liquid. Via tube 12, the gas through valve 15 is removed to the atmosphere, and the liquid through channels 13, 22 and 23 enters the tank 24, where the final separation of the liquid from the gas occurs. This mode allows both manual and automatic regulation of the gas supply to the heat exchange cavities of casting molds. Fig, 2 also shows the operation of the system without devices 24-34, for example, when using water from the workshop main as a heat-transfer fluid. Fig, 3 shows the operation of the system in the mode of gas heat exchange mold. Valve 4 is open, valve 3 is blocked. Compressed gas, coming from line 57 through pneumohydraulic channel 7, lifts the float 17 (when the opening 16 is closed and the connection of the housing 15 with the atmosphere is stopped), then through the opening 18 in the float and the tube 12, the pneumatic hydraulic channels 10 and 11 enter the cavities 8 and 9 and the end 13 of the tube 12 at level 21, and in cavities 8 and 9 at level 20, equal pressures .JP, 3) of compressed gas and hydrostatic pressure of the liquid column (DN2 + H2) are established, since the incoming portions of gas pass through the liquid located in cavities 44 and 45, channels 42 and 43 and tanks 36, and further are removed to the atmosphere through the tube 41. The end 13 of the tube 12 is lowered below level 21 to a height of & NS to level 58, which prevents gas from escaping into the atmosphere through tank 14, which communicates with the atmosphere. This case is shown in FIG. 3 and FIG. 4. If the design height lNZ made negative, t, s. level 58 is located ALL 2, as shown in FIG. 5, the moving gas is released into the atmosphere through the liquid of the container 14. In this case, the gas displaces the liquid in the heat exchange cavities 8 and 9 not completely, which can be used to organize differentiated cooling (heating) of the upper and lower parts of the walls 1 with gas and liquid and 2 molds. This cooling mode can be organized without gas escaping into the atmosphere (Fig. 6). In these modes, the circulation of fluid in the system stops as the level of liquid 40 in the tank 36 reaches its highest possible position, the float 39 floats up through the lever 38 by stopper 37 blocks the flow of fluid from the tank 34. The tank 34 is calculated in such a way that it does not overflow when the liquid level 29 is reached in the tank 24 after which the pump 31 is automatically turned off. The system can be designed so that between the hydrostatic pressure of the liquid heat exchange medium at the bottom of the heat exchange cavities 8 and 9, 44 and 45 of the mold P at level 20, the hydrostatic pressure in tank 14 with liquid P | at the level 58 of the end of the inverted U-shaped tube 12 and the pressure of the compressed gas in the channel 7. One of the following relationships was performed: (Fig-), (Fig. 5) CP. .- (6) When alternating heat exchange media in the temperature control system of the mold, heating of the heat-carrying medium from additional heat sources and / or cooling of coolers in special devices are excluded. Claim 1. The system for regulating the temperature of casting molds, containing sources of liquid, gaseous and gas-liquid heat transfer fluids, connected to the corresponding circulation circuit formed by pneumohydrochannels, heat exchangers of mold cavities, heat sensors of casting molds and heat carrier connected with a control unit connected to the actuators for the supply of liquid, gaseous, gas-liquid coolants, about 706 liters, and so that, in order to simplify the design, and reliability, efficiency and expansion of the regulation range, the circulation circuits of all the heat carriers are interconnected by heat exchange cavities of the casting molds and pneumo-hydraulic channels through intermediate tanks into a system of communicating with each other vessels. 2. The control system of claim 1, characterized in that it comprises a U-shaped tube, one end of which is placed in a first intermediate tank with a gap relative to its bottom, and is assembled with lateral branches made in the upper part of the U-shaped tube and connected to the heat exchange cavities of the casting molds in their upper part, the other end of the U-shaped tube is connected through a shut-off valve to a circuit for supplying a gaseous heat carrier, and the shut-off valve is designed as a float mounted in the housing with a clearance There is a central hole in it, and in the upper part of the valve body there are holes connected to the atmosphere, the first intermediate tank is connected to the circulation circuit of the heat-transfer fluid through the second and third intermediate tanks with intermediate heat exchange cavities of the mold, and the hydrostatic pressure P is liquid heat carrier at the bottom of heat exchange cavities of casting molds and hydrostatic pressure P in the vessel, with liquid heat. .tr. a carrier at the end of a U-shaped tube placed in a vessel, pressure P (gaseous coolant in the system and a. atmospheric pressure are related by one of the following ratios: IK. pG v g P; p pg. p ;; p G.TP P / p R-GF p p U2.1 J7 J9 38 39 38 Baud feed (Mashstratny Plumbing) j , ft G7 f, / 7 - / Vj J c ffri-f h   fc   v