JPH069721Y2 - Temperature control device for casting mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a device for controlling the temperature of a casting mold.

(Prior Art) When a molten metal is generally poured into a cavity of a mold made of copper alloy or the like for casting, cooling is performed for the purpose of cooling the mold and the casting after the pouring. As such a cooling method, for example, as disclosed in Japanese Utility Model Laid-Open No. 60-11146, there is a method in which a heat exchange medium distribution pipe is provided in a mold. In a mold casting line, if the mold is not cooled sufficiently and repeated pouring is performed, the temperature of the mold itself rises and the life of the mold shortens, which causes inconvenience. Needs to be lowered below a certain temperature. In addition, if the temperature of the mold is lower than a certain temperature during the pouring of the molten metal, the pouring of the molten metal will be cooled rapidly and the surface of the product will be roughened. Therefore, the mold temperature is measured by a temperature sensor so as to keep the mold temperature within a certain range, and the mold is cooled by circulating cooling water in the pipe as needed based on the measurement result. When it is determined that the pipe can be cooled to the predetermined temperature by the next pouring, control such as stopping the pouring of water into the pipe has been performed.

(Problems to be solved by the invention) However, in the method of injecting cooling water into the pipe to adjust the temperature of the mold, if the mold is cooled too much,
Since no means for positively heating the mold is provided, the above-described inconvenience such as surface roughness of the cast product due to the decrease in mold temperature is likely to occur. Further, in the first casting, in order to raise the temperature of the mold cooled to room temperature to a set temperature, it is necessary to perform so-called carouching for injecting molten metal into the cavity. In order to positively take measures against such cooling of the mold, a method of providing an electric heater heating device inside the mold or on the rear surface of the mold may be considered. Since the parts are different, the accuracy of temperature control also decreases. Further, structurally, it is not preferable to dispose the heater because of the space.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a temperature control device for a casting mold, which is excellent in accuracy and has a rational structure.

(Means for Solving the Problem) The present invention is directed to a temperature control pipe arranged in the peripheral portion of a cavity of a casting mold, a cooling water supply means for supplying cooling water to the pipe, and the pipe. A steam supply means for supplying steam, a bypass passage having one end connected to a supply-side passage connecting the cooling water supply means and the steam supply means and the pipe, and the other end serving as a discharge port bypassing the pipe, An on-off valve provided in the bypass passage, a temperature sensor for detecting the temperature of the mold, and the cooling water supply so that the temperature of the mold falls within a set temperature range based on an output signal from the temperature sensor. Means for controlling the operation and deactivation of the steam supply means and the steam supply means, and for closing the opening / closing valve when the supply means is operating and opening the opening / closing valve when the operation is stopped. And are characterized.

The set temperature is set in a certain range, when the mold temperature is higher than the set temperature, the cooling water supply means is activated, and when the temperature is lower than the set temperature, the steam supply means is It works.

(Operation) Since the present invention has the structure as described above, it is possible to perform both cooling and heating of the mold as needed using the same temperature control pipe. Further, when the operation of the cooling water supply means or the steam supply means is stopped, the opening / closing valve is opened, so that the cooling water or steam in the supply side passage or the pipe is discharged from the bypass passage, and the residual cooling water or Supercooling or overheating by steam can be suppressed. Further, in particular, when the steam is supplied to heat after supplying the cooling water, if cooling water remains in the supply side passage or the pipe, the steam is pushed out by the steam while pushing the cooling water in the pipe. However, since the steam is a gas and has compressibility, the force for pushing out the cooling water is weak, so that the cooling water is not pushed out immediately even if the steam is fed, and the steam in the pipe is There is a problem that the supply of time is delayed and the responsiveness of temperature control is poor.
However, according to the present invention, since the opening / closing valve is opened when the operation of the cooling water supply means is stopped as described above, the cooling water in the supply side passage or the pipe is discharged through the bypass passage as described above. Therefore, when it is desired to operate the steam supply means next time, steam is immediately supplied into the pipe, and temperature control with good responsiveness becomes possible.

(Embodiment) An embodiment of the temperature control device for a casting die of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, in the mold 2 in which the molten metal is cast into the cavity 1 in the direction of arrow A for casting, it is necessary to adjust the temperature of the casting in the cavity 1 and the mold 2 itself. That is, the initial temperature of the mold 2 is generally 100 ° C.
A temperature of ~ 150 ° C is appropriate, and if the temperature of the mold 2 is lower than this, it causes the surface of the casting to be roughened, and if the molten metal is repeatedly poured at a temperature higher than this, the durability of the mold is deteriorated. . Therefore, a desirable temperature before pouring of the mold 2 is set as a target temperature, for example, 100 ° C. to 150 ° C. as a target temperature, and a temperature control device for adjusting the temperature so that the mold temperature falls within the set temperature range is arranged. It is set up. The temperature control device and its function will be described below.

A temperature adjusting pipe 3 is arranged in the main body of the mold 2 around the cavity 1, and cooling water supplying means 4 for supplying cooling water and steam for heating are supplied in the pipe 3. A steam supply means 5 is provided. These supply means 4 and 5 cool the mold 2 by opening the cooling water supply valve 4a to supply the cooling water from the water supply port into the pipe 3 and to circulate and discharge the pipe 3 (arrow B). The mold 2 can be heated by opening the steam supply valve 5a and taking in steam from the steam intake part and passing this steam through the pipe 3 and discharging it (arrow B). As steam, factory steam (5 atm 130-140
℃) is suitable. Generally, it is necessary to operate the casting water at the time of pouring the molten metal into the cavity 1, the operation of the cooling water supply means at the time of cooling the die, and the operation of the steam supply means at the time of the die temperature control during the casting cycle and the die preheating at the start of operation. Needed.
However, in order to appropriately perform such cooling or heating according to the temperature of the mold 2, the cooling water supply means 4 and the steam supply means 5 are connected to a mold temperature control device 7 which is a control means. A thermocouple 6 is connected to the mold temperature control device 7 as a temperature sensor for detecting the mold temperature, and a signal of the temperature of the mold 2 detected by the thermocouple 6 is output to the control device 7 to supply cooling water. Operation and stop of the means 4 The operation and stop of the steam supply means 5 are switch-controlled.

For example, when the temperature of the mold 2 becomes higher than the set temperature range and cooling is required, the mold temperature control device 7 which receives the output signal of the thermocouple 6 activates the cooling water supply means 4 as described above. Cool the mold 2. When a signal indicating that the temperature of the mold 2 is cooled to a predetermined temperature is output from the thermocouple 6 to the control device 7, the control device 7 stops the supply of the cooling water from the cooling water supply means 4 and at the same time, supplies the supply means. One end is connected to a supply side passage connecting the temperature adjusting pipes 3 and 4, and the pipe 3 is bypassed and the other end is a discharge port (in the present embodiment, this discharge port is the pipe 3 of the mold 3). (Connected to the discharge side passage connected to the discharge side)
Opening / closing valve 8 for discharge provided in the bypass passage
Is commanded to be released, whereby the cooling water in the pipe 3 and the supply side passage is discharged (in the direction of arrow B ') and the cooling is stopped. Further, when the thermocouple 6 detects that the temperature of the mold 2 is lower than the set temperature range and sends an output signal to the control device 7, the control device 7 operates the steam supply means 5 and the mold 2 Perform heating. When a signal indicating that the mold 2 has been heated to a predetermined temperature is output from the thermocouple 6 to the control device 7, the control device 7 stops the steam supply from the steam supply means 5 and is provided in the bypass passage at the same time. A command is issued to open the discharge on-off valve 8, whereby the steam in the pipe 3 and the supply passage is discharged (in the direction of arrow B '), and the heating is stopped.

In this embodiment, the entire mold 2 is uniformly cooled and heated. However, in the low pressure casting method, for example, the temperature of the lower part of the mold is lowered because the molten metal is injected into the cavity from below the mold at a slow speed. There is a phenomenon that the temperature is different depending on the part of the mold, such that the temperature becomes higher than that at the top. For this reason, it becomes necessary to perform individual control such as shifting the control timing depending on the part of the mold. An embodiment of an apparatus capable of performing such control is shown in FIG. In this embodiment, the mold 10
An upper pipe 11a for temperature adjustment and a lower pipe 11b for adjusting the temperature of each of the upper portion 10a and the lower portion 10b are disposed in the mold 10 main body around the cavity 12. These plumbing 11
a and 11b are individually controlled, and the upper piping 11a
Is connected to the upper cooling water supply means 13 and the upper steam supply means 14, the lower pipe 11b is connected to the lower cooling water supply means 15 and the lower steam supply means 16, the upper thermocouple 17a The temperature of the upper part 10a of the mold is detected, and the thermocouple 17b for the lower part detects the temperature of the lower part 10b of the mold and outputs a signal to the mold temperature control device 18, which is a control means. The mold temperature control device 18 receives the respective output signals and performs the same switching control as that shown in the first embodiment on the respective supply means 13, 14, 15, 16 and the upper discharge on-off valve 19 and the lower discharge. Open / close valve 20. That is, when the upper thermocouple 17a detects that the temperature of the upper part 10a of the mold is out of the set temperature range and a signal is output to the control device 18, a command from the control device 18 causes the upper cooling water supply means 13 or the upper cooling water supply means 13. Steam supply means 14
The valve 13a or 14a is opened and cooling water or steam is passed in the direction of arrow C to cool or heat the upper mold part 10a, whereby the temperature of the upper mold part 10a falls within the set temperature range. When a signal is output from the upper thermocouple 17a to the control device 18, the valve 13a or the valve 14a is closed by a command from the control device 18, the upper discharge opening / closing valve 19 is opened, and an arrow C '
Direction is discharged and cooling or heating is stopped.

Further, when the lower thermocouple 17b detects that the temperature of the lower mold part 10b is out of the set temperature range and outputs a signal to the control device 18, the control device 18 instructs the lower part cooling water supply means 15 to operate. When the valve 15a or the valve 16a of the lower steam supply means 16 is opened and the cooling water or steam is supplied in the direction of the arrow D and the temperature is within the set temperature range, the valve 15a or the valve 16a is closed and the lower part is discharged in the same manner as described above. The opening / closing valve 20 is opened, discharge is performed in the direction of the arrow D ', and cooling and heating are stopped. As described above, in the present embodiment, it is possible to perform the temperature control of the mold more precisely because individual controls such as cooling by shifting the timing between the mold upper part 10a and the mold lower part 10b are possible.

(Effects of the Invention) The temperature control device for a casting mold of the present invention can perform cooling and heating as needed using the same temperature control pipe. Therefore, the mold temperature control by cooling and heating can be performed at the same position, and the accuracy of the mold temperature control can be improved. Further, since the same pipe can be used for both heating and cooling, the temperature control device is not complicated, and the temperature can be reasonably controlled with a simple structure. Further, since the on-off valve is opened when the operation of the cooling water supply means or the steam supply means is stopped,
Cooling water or steam in the supply side passage or the pipe is discharged from the bypass passage, and it is possible to suppress overcooling or overheating due to residual cooling water or steam. Further, in particular, when steam is supplied to heat after supplying cooling water, if cooling water remains in the supply passage or the pipe, a time delay occurs in the supply of steam into the pipe. In the present invention, since the opening / closing valve is opened when the operation of the cooling water supply means is stopped, the cooling water in the supply side passage and the pipe is discharged through the bypass passage, so that it is desired to operate the steam supply means next time. Occasionally, steam is immediately supplied to the pipe, which enables temperature control with good responsiveness.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view of an embodiment of a temperature control device for a casting mold of the present invention, and FIG. 2 is an explanatory view of another embodiment of the present invention. 1, 12 ... Cavity, 2, 10 ... Mold 3, 11a, 11b ... Temperature control pipe 4, 13, 15 ... Cooling water supply means 5, 14, 16 ... Steam supply means 6, 17a, 17b ... Temperature sensor ( Thermocouple) 7,18 ... Control means (mold temperature control device)

Claims (1)

[Scope of utility model registration request] 1. A temperature adjusting pipe arranged in the peripheral portion of a cavity of a casting mold, a cooling water supplying means for supplying cooling water to the pipe, and a steam supplying means for supplying steam to the pipe. A bypass passage having one end connected to a supply-side passage that connects the cooling water supply means and the steam supply means to the pipe, and a bypass passage that bypasses the pipe and has the other end serving as a discharge port; and an opening / closing provided in the bypass passage A valve, a temperature sensor that detects the temperature of the mold, and the operation of the cooling water supply means and the steam supply means so that the temperature of the mold falls within a set temperature range based on the output signal from the temperature sensor. Control means for controlling the stoppage of operation, closing the on-off valve when the supply means is in operation, and opening the on-off valve when operation is stopped. Degree control device.