JP4341494B2 - Mold calorimetry method, temperature control method, calorimetry device, and temperature control device - Google Patents

Description

  The present invention relates to a mold calorie measurement method, a temperature control method, a calorie measurement device, and a temperature control device when a molded product is cast by solidifying molten metal that is melt-filled in a mold.

In the casting process such as die casting, when the molten metal is cooled and solidified after being melt-filled in the cavity of the mold, the molten metal near the cavity surface of the mold is rapidly cooled and solidified first, Residual stress may be generated inside the finished product or a nest may be generated, which may cause problems such as deterioration of product quality.
Therefore, in order to stabilize the molten metal filling temperature and improve the cooling state, the molten metal filled in the cavity is irradiated with ultrasonic waves to measure the state of solidification of the molten metal, and the mold cooling state Has been devised (see Patent Document 1).
JP-A-5-329611

The solidification state and cooling state of the molten metal filled in the cavity are greatly affected by the temperature of the mold having a large heat capacity. However, in the technique described in Patent Document 1, the solidification state of the filled molten metal is described. Since the temperature of the entire mold cannot be detected, the cooling state of the mold cannot be accurately controlled, and stable casting of products without casting defects is impossible. It was difficult.
Therefore, the present invention provides a mold calorie measurement method, a temperature control method, a calorie measurement device, and a temperature control device capable of stably casting a product having no casting defects.

The mold calorimetry method, the temperature control method, the calorimeter, and the temperature controller that solve the above problems have the following characteristics.
That is, claim 1 as described, when casting a solidifying the molten metal which is soluble filled in a mold shaped articles, whether et ultrasonic die table surface is irradiated, the mold surface and the cavity surface When a reflection member that reflects a part of the ultrasonic wave is installed in the ultrasonic wave propagation path between the mold and the amount of heat held by the entire mold is calculated , the irradiated ultrasonic wave is reflected from the mold surface to the reflection member. Measure the time to reach and the time to reach the cavity surface from the mold surface, and based on the measured time, the amount of mold heat between the mold surface and the reflective member, and the reflective member The heat quantity of the mold between the cavity surface is calculated, and the heat quantity distribution of the whole mold is obtained using each calculated heat quantity of the mold.
Thereby, the cooling degree of a metal mold | die can be adjusted according to the calculated calorie | heat amount, and it becomes possible to control appropriately the metal mold temperature which has big influence on solidification of a molten metal.
In addition, it is possible to grasp the required cooling amount at each part in the mold, and it is possible to realize directional solidification by performing appropriate temperature control.

According to a second aspect of the present invention, there is provided a mold temperature control method for casting a molded product by solidifying a molten metal melt-filled in a mold, wherein the molten metal is melt-filled in the mold. Until the melted and filled molten metal solidifies, the step of irradiating the ultrasonic wave from an appropriate location on the mold surface or inside the mold, and the irradiated ultrasonic wave on the mold surface or inside the mold as appropriate A step of measuring in real time the time from the location to the inside of the mold to reach the cavity surface, a step of calculating in real time the amount of heat held by the entire mold based on the measured time, and the calculated amount of heat Accordingly, the step of controlling the temperature of the mold by the cooling means provided in the vicinity of the mold, and the average temperature of the mold is calculated from the propagation time of the ultrasonic wave, and the surface of the mold or inside the mold is appropriately selected. Temperature measuring hand installed at the place Measure the mold temperature at the appropriate location on the mold surface or inside the mold, and calculate the entire mold from the calculated average temperature of the mold and the measured mold temperature at the appropriate location on the mold surface or inside the mold. Predicting the temperature distribution.
As a result, it is possible to grasp the cooling condition of the mold after filling the molten metal in real time, to appropriately control the temperature of the mold, to realize the directional solidification of the molten metal, and to prevent casting defects. It is possible to stably cast products that are not present.
In addition, the temperature distribution of the mold can be easily measured in real time. And by monitoring the measured temperature distribution, it is possible to prevent in advance the local overheating and temperature drop of the mold.

Further, according to the third aspect of the present invention, the mold temperature control method sets in advance a change in the calorific value of the mold necessary for the molten metal filled in the cavity to solidify, and after the molten metal is calculated in real time. When the amount of change in the heat amount of the mold reaches the set amount of heat change, a step of opening the mold is included.
By this, if the amount of melt cooling required from the filling of the molten metal to solidification is obtained in advance, when the heat amount change of the mold after filling the molten metal reaches the amount of molten metal cooling necessary for solidification, The mold opening can be controlled by controlling the mold opening means. Then, the mold can be opened immediately after the solidification of the molten metal is completed, and the cycle time of the casting process can be shortened.

According to a fourth aspect of the present invention, a reflection member that reflects a part of the ultrasonic wave is installed in an ultrasonic wave propagation path between the mold surface or an appropriate place inside the mold and the cavity surface, and the ultrasonic wave Measure the time to reach the reflecting member from the appropriate part of the mold surface or inside the mold, and the time to reach the cavity surface from the appropriate part of the mold surface or inside the mold to measure the mold surface or mold The mold average temperature between the appropriate portion inside and the reflecting member, and the mold average temperature between the reflecting member and the cavity surface were calculated, and each mold average temperature calculated was measured by the temperature measuring means. Using the mold temperature on the mold surface and the cavity surface, the temperature distribution of the entire mold is obtained.
As a result, it is possible to measure the temperature at a plurality of locations inside the mold and grasp an accurate temperature distribution, and it is possible to more surely prevent the occurrence of local overheating and temperature decrease of the mold.

Further, as described in claim 5, the temperature measuring means is a thermocouple.
Thereby, temperature measurement can be performed easily and accurately.

Further, as described in claim 6, when casting a molded product by solidifying the molten metal melted and filled in the mold, ultrasonic irradiation is performed to irradiate ultrasonic waves from an appropriate location on the mold surface or inside the mold. Means, a reflection member installed in an ultrasonic wave propagation path between the mold surface and the cavity surface, and reflecting a part of the irradiated ultrasonic wave, and an ultrasonic mold irradiated from the ultrasonic irradiation means A time measuring means for measuring the propagation time in the inside and a calculating means for calculating the amount of heat held by the mold based on the measured time, and the time measuring means allows ultrasonic waves to reach the reflecting member from the mold surface. Measuring the time to the mold surface and the time to reach the cavity surface from the mold surface, and based on the time measured by the calculation means, the amount of mold heat between the mold surface and the reflecting member, and Reflecting member and cavity surface Calculating a mold heat between, using the calculated each mold heat, obtaining a heat distribution of the entire mold.
Thereby, the cooling degree of a metal mold | die can be adjusted according to the calculated calorie | heat amount, and it becomes possible to control appropriately the metal mold temperature which has big influence on solidification of a molten metal.
In addition, it is possible to grasp the required cooling amount at each part in the mold, and it is possible to realize directional solidification by performing appropriate temperature control.

Further, as described in claim 7, the ultrasonic wave is irradiated from an appropriate location on the mold surface or inside the mold after the molten metal is melt-filled in the mold until the melt-filled molten metal is solidified. Ultrasonic irradiation means and the time required for the ultrasonic wave emitted from the ultrasonic irradiation means to propagate through the mold surface from an appropriate location inside the mold or inside the mold to reach the cavity surface in real time A time measuring means, a calculating means for calculating in real time the amount of heat held by the entire mold based on the measured time, and a cooling means for controlling the temperature of the mold according to the calculated amount of heat, The time until the ultrasonic wave irradiated by the ultrasonic irradiation means propagates from the surface of the mold or an appropriate location inside the mold to reach the cavity surface is measured in real time by the time measuring means. , Measured Based on the interval, the amount of heat held by the entire mold is calculated in real time by the calculation unit, the temperature of the mold is controlled by the cooling unit according to the calculated amount of heat, and the ultrasonic wave is calculated by the calculation unit. Calculate the average temperature of the mold from the propagation time of the mold, and measure the temperature of the mold on the mold surface or inside the mold by the temperature measuring means installed on the mold surface or inside the mold. The temperature distribution of the entire mold is predicted from the average temperature of the mold and the measured mold temperature at the appropriate location on the mold surface or inside the mold.
As a result, it is possible to grasp the cooling condition of the mold after filling the molten metal in real time, to appropriately control the temperature of the mold, to realize the directional solidification of the molten metal, and to prevent casting defects. It is possible to stably cast products that are not present.
Furthermore, the temperature distribution of the mold can be easily measured in real time. And by monitoring the measured temperature distribution, it is possible to prevent in advance the local overheating and temperature drop of the mold.

In addition, according to the eighth aspect of the present invention, the mold temperature control device calculates in advance the heat amount change of the mold necessary for the molten metal filled in the cavity to solidify in the calculation means, and is calculated in real time. When the amount of change in the heat amount of the mold after filling the molten metal reaches the set heat amount change, the mold is opened.
Thus, if the amount of melt cooling required from the filling of the molten metal to solidification is obtained in advance, when the amount of heat change of the mold after filling the molten metal reaches the amount of molten metal cooling necessary for solidification, It is possible to perform mold opening by controlling the mold opening means. Then, the mold can be opened immediately after the solidification of the molten metal is completed, and the cycle time of the casting process can be shortened.

According to a ninth aspect of the present invention, the mold temperature control device is installed in an ultrasonic wave propagation path between the mold surface or an appropriate place inside the mold and the cavity surface, and reflects a part of the ultrasonic wave. A reflection member is provided, and the time measurement means allows time for the ultrasonic wave to reach the reflection member from an appropriate location on the mold surface or inside the mold, and reach the cavity surface from an appropriate location on the mold surface or inside the mold. Measure the time to do, and by the calculation means, the mold average temperature between the mold surface or an appropriate place inside the mold and the reflection member, and the mold average temperature between the reflection member and the cavity surface And the temperature distribution of the entire mold is obtained using the calculated average temperature of each mold and the mold temperatures of the mold surface and the cavity surface measured by the temperature measuring means.
As a result, it is possible to measure the temperature at a plurality of locations inside the mold and grasp an accurate temperature distribution, and it is possible to more surely prevent the occurrence of local overheating and temperature decrease of the mold.
According to a tenth aspect of the present invention, the temperature measuring means is a thermocouple.
Thereby, temperature measurement can be performed easily and accurately.

According to the present invention, the degree of cooling of the mold can be adjusted according to the calculated amount of heat, and the temperature of the mold that greatly affects the solidification of the molten metal can be appropriately controlled.
In addition, it is possible to grasp the cooling condition of the mold after filling the molten metal in real time, and to appropriately control the temperature of the mold, to realize the directional solidification of the molten metal, and there is no casting defect. It becomes possible to stably cast the product.
Furthermore, it is possible to prevent in advance the local overheating and temperature decrease of the mold.

Next, modes for carrying out the present invention will be described with reference to the accompanying drawings.
A mold 1 shown in FIG. 1 includes an inner mold 11 and an outer mold 12, and a cavity 13 is formed in the inner mold 11. The injection machine 2 is connected to the inlet 13a of the cavity 13, and the molten metal 8 is filled into the cavity 13 by the movement of the plunger 2a of the injection machine 2.
Further, in the vicinity of the boundary between the outer mold 12 and the inner mold 11, an ultrasonic sensor 5 that is an ultrasonic irradiation unit and a cooling pipe 6 are embedded.

The ultrasonic sensor 5 emits ultrasonic waves from the surface 11a of the inner mold 11 (that is, the installation surface of the ultrasonic sensor 5) toward the cavity 13, and propagates through the inner mold 11 and is reflected by the cavity surface 11b. The ultrasonic waves that are returned are received, and are connected to the mold calorific value measuring device 3.
In this example, the surface 11 a of the inner mold 11 is the outer surface of the inner mold 11 in contact with the outer mold 12, and the cavity surface 11 b is the inner surface of the inner mold 11 constituting the cavity 13.
Cooling water circulates in the cooling pipe 6, and the amount of cooling water flowing in the cooling pipe 6 is adjusted by the cooling water amount control device 4, so that the molten metal 8 is filled in the cavity 13 at the time of casting. The cooling temperature of the mold 1 is controlled. The cooling pipe 6 and the cooling water amount control device 4 constitute cooling means for controlling the cooling temperature of the mold 1.

The mold calorimeter 3 is a time measuring unit that uses the ultrasonic wave from the time when the ultrasonic sensor 5 radiates the ultrasonic wave and the time when the ultrasonic wave reflected and returned from the cavity surface 11b is received. 11 is measured from the surface 11a of the mold 11 until it reaches the cavity surface 11b by propagating through the inside of the inner mold 11, and the entire mold 1 is held based on the measured time as a calorie calculation means of the mold 1. It is possible to calculate the amount of heat.
The calculation of the amount of heat is based on the fact that the speed of the ultrasonic wave propagating in the mold 1 depends on the temperature of the mold 1, and the ultrasonic propagation time determined in advance and the entire mold 1 are calculated. The relationship with the amount of heat is stored in the storage device of the mold heat quantity measuring device 3.

The mold heat quantity measuring device 3, the cooling water amount control device 4, the ultrasonic sensor 5, the cooling pipe 6, and the like configured as described above constitute a temperature control device for the mold 1. Among the temperature control devices, the ultrasonic sensor 5 and the mold calorie measuring device 3 also have the function of a mold calorimeter.
A mold temperature control method by the mold 1 temperature control apparatus will be described below according to the flow shown in FIG.

First, as a preliminary preparation before starting casting, as described above, the relationship between the propagation time of the ultrasonic wave in the mold 1 and the heat quantity of the entire mold 1 is obtained by the mold calorimeter 3, and the relational expression is obtained. Is stored in the die calorimeter 3 (S01).
In addition, an optimum cooling curve indicating the optimum temperature of the mold 1 at each time point during casting is derived by the mold calorimeter (S02).

After the casting operation is started, before the molten metal 8 is filled in the cavity 13, the time required for the ultrasonic wave to propagate from the surface 11a of the inner mold 11 through the inner mold 11 to reach the cavity surface 11b is determined by the amount of mold heat. The measurement is performed by the measuring device 3 (S03), and the amount of heat held by the entire mold 1 before the molten metal filling is calculated based on the measured time (S04).
The heat quantity of the mold 1 is calculated by fitting the arrival time of the ultrasonic wave measured in step S03 to the “relational expression between the ultrasonic wave propagation time and the heat quantity of the entire mold 1” derived in step S01. To do.

Next, the molten metal 8 is filled in the cavity 13, and after the molten metal is filled, the ultrasonic wave is irradiated from the ultrasonic sensor 5, and the time required for the ultrasonic wave to reach the cavity surface 11b from the surface 11a of the inner mold 11 is set as gold. Measurement is performed by the mold calorimeter 3 (S05).
Then, the measured arrival time is applied to the above-described “relational expression between the propagation time of the ultrasonic wave and the heat amount of the entire mold 1” to calculate the total heat amount of the mold 1 after filling the molten metal (S <b> 06).

Further, the mold calorimeter 3 compares the total heat of the mold 1 after filling the melt calculated in step S06 with the total heat of the mold 1 before filling the melt calculated in step S04. Calculate the amount of heat change before and after. The change in the amount of heat of the mold 1 is set as a molten metal cooling amount that is the amount of heat taken from the filled molten metal 8 (step S07).
The calculated molten metal cooling amount is compared with the optimum cooling curve derived in step S02, and the difference between the molten metal cooling amount and the optimum cooling amount determined from the optimum cooling curve is calculated by the mold calorimeter 3. (S08).

Then, the calculated cooling amount difference is fed back to the cooling water amount control device 4, and the cooling water amount control device 4 fills the difference, that is, the molten metal cooling amount calculated in step S07 is the optimum cooling amount. Thus, the amount of cooling water flowing through the cooling pipe 6 is controlled to control the temperature of the mold 1 (S09).
Thereafter, the flow from step S05 to S09 is repeated until the filled molten metal 8 is solidified. After the molten metal 8 is solidified, the mold is opened and the product is taken out.

In this way, before and after filling the molten metal 8 into the cavity 13, ultrasonic waves are irradiated from the surface 11 a of the inner mold 11 of the mold 1, and the irradiated ultrasonic waves propagate through the inner mold 11 from the surface 11 a. Then, the time required to reach the cavity surface 11b which is the inner surface of the cavity 13 is measured, and the amount of heat held by the entire mold 1 is calculated based on the measured time.
Thus, the amount of cooling of the mold 1 can be adjusted by controlling the amount of cooling water flowing through the cooling pipe 6 according to the calculated amount of heat, and the temperature of the mold 1 that has a great influence on the solidification of the molten metal 8 is appropriately set. It becomes possible to control.

Furthermore, after the molten metal 8 is filled into the cavity 13, the steps from S05 to S09 described above are repeatedly executed, and ultrasonic waves are irradiated from the surface 11a of the inner mold 11 until the molten metal 8 is filled and solidified. In addition, the time until the ultrasonic wave reaches the cavity surface 11b from the surface 11a is measured in real time, and the amount of heat held by the entire mold 1 is calculated in real time based on the measured time, and according to the calculated amount of heat. The temperature of the mold 1 is controlled.
As a result, the cooling state of the mold 1 after filling the molten metal can be grasped in real time, the temperature control of the mold 1 can be appropriately performed, and the directional solidification of the molten metal 8 can be realized. It becomes possible to stably cast a product free from casting defects.

Moreover, since the molten metal 8 is filled into the cavity 13 and the steps from S05 to S09 are repeatedly executed, the change in the calorific value of the mold 1 after filling the molten metal can be calculated in real time. If the molten metal cooling amount required from the filling to the solidification is obtained in advance and stored in the mold calorimeter 3, the change in the calorie of the mold 1 after filling the molten metal 8 is necessary for the solidification. When the molten metal cooling amount is reached, it is possible to perform mold opening by controlling the mold opening means of the mold 1.
As a result, the mold 1 can be opened immediately after the solidification of the molten metal 8 is completed, and the cycle time of the casting process can be shortened.
In this example, the ultrasonic sensor 5 is disposed on the surface 11a portion of the inner mold 11, but it is disposed in a concave portion formed from the surface 11a of the inner mold 11 toward the cavity surface 11b. 11 can also be embedded at an appropriate location inside.

Next, a second embodiment of the temperature control device for the mold 1 will be described.
In the mold 1 shown in FIG. 3, as in the case of FIG. 1, the injector 2 is connected to the inlet 13 a of the cavity 13, and an ultrasonic sensor is located in the vicinity of the boundary between the outer mold 12 and the inner mold 11. 5 and a cooling pipe 6 are embedded. Further, in the vicinity of the boundary between the outer mold 12 and the inner mold 11, a thermocouple 9 as a temperature measuring means is embedded. The thermocouple 9 and the ultrasonic sensor 5 are connected to a mold temperature distribution measuring device 7.

  In the inner mold 11, an ultrasonic reflection member 51 is provided in the middle of the propagation path of the ultrasonic wave irradiated from the ultrasonic sensor 5. The reflection member 51 reflects a part of the ultrasonic wave irradiated from the ultrasonic sensor 5 to the ultrasonic wave side. In this example, the reflection member 51 is arranged on the surface 11a side of the inner mold 11. The first reflecting member 51a and the second reflecting member 51b disposed on the cavity surface 11b side are provided at two locations.

And the temperature control apparatus of the metal mold | die 1 is comprised by the ultrasonic sensor 5, the cooling pipe 6, the thermocouple 9, the reflection member 51, the metal mold | die temperature distribution measuring device 7, etc. FIG.
A method of mold temperature control by the temperature control device of the mold 1 will be described below according to the flow shown in FIG.

First, an ultrasonic wave is irradiated from the ultrasonic sensor 5 toward the cavity 13, and the propagation time of the ultrasonic wave in the mold 1 is measured by the mold temperature distribution measuring device 7 (S11).
In this case, since the ultrasonic wave reflected by the first reflecting member 51a, the ultrasonic wave reflected by the second reflecting member 51b, and the ultrasonic wave reflected by the cavity surface 11b return to the ultrasonic sensor 5, In the mold temperature distribution measuring device 7, the propagation time from the surface 11a of the inner mold 11 to the first reflecting member 51a, the propagation time from the first reflecting member 51a to the second reflecting member 51b, and the cavity from the second reflecting member 51b to the cavity The propagation time to the surface 11b is measured.

Here, since the speed of the ultrasonic wave propagating through the mold 1 depends on the temperature of the mold 1 as described above, the surface 11a of the inner mold 11 in the mold 1 is determined from the measured propagation time of each ultrasonic wave. The average temperature in the range from the first reflective member 51a to the first reflective member 51a, the average temperature in the range from the first reflective member 51a to the second reflective member 51b, and the average temperature in the range from the second reflective member 51b to the cavity surface 11b. Calculation is performed by the mold temperature distribution measuring device 7 (S12).
Further, the temperature of the surface 11a and the temperature of the cavity surface 11b in the inner mold 11 are measured by the thermocouple 9 embedded in the mold 1, and the measurement results are input to the mold temperature distribution measuring device 7 ( S13).
The dimensions of the range from the surface 11a of the inner mold 11 to the first reflecting member 51a, the range from the first reflecting member 51a to the second reflecting member 51b, and the range from the second reflecting member 51b to the cavity surface 11b are as follows: It is desirable to set the dimensions so that the temperature gradient within each range can be linearly approximated.

  Next, in the mold temperature distribution measuring device 7, the temperature calculated from the surface 11a, the average temperature in the range R1 from the surface 11a to the first reflecting member 51a, and the first reflecting member 51a to the second calculated and measured as described above. On the propagation path of the ultrasonic wave irradiated from the ultrasonic sensor 5, such as the average temperature of the range R2 to the reflecting member 51b, the average temperature of the range R3 from the second reflecting member 51b to the cavity surface 11b, and the temperature of the cavity surface 11b. The temperature distribution of the mold 1 is calculated and calculated using the temperatures at the respective locations (S14).

In this example, the reflective member 51 is provided at two locations, and the temperature distribution is obtained using the temperatures of the surface 11a, the range R1, the range R2, the range R3, and the cavity surface 11b. It is also possible to obtain the temperature distribution by providing the temperature at more points and using the temperature at more measurement points. Conversely, without providing the reflecting member 51, the temperature distribution can also be obtained using the average temperature in the range from the surface 11a of the inner mold 11 to the cavity surface 11b, the temperature of the surface 11a, and the temperature of the cavity surface 11b.
Further, in this example, the thermocouple 9 is disposed on the surface 11 a portion of the inner mold 11, but may be embedded at an appropriate location inside the inner mold 11.

In this way, the temperature of the mold 1 can be determined by repeatedly performing the steps from step S11 for measuring the propagation time of ultrasonic waves to step S15 for calculating the temperature distribution until the molten metal 8 is filled and solidified. The distribution can be easily measured in real time.
Then, by monitoring the measured temperature distribution, it is possible to prevent local overheating and temperature decrease of the mold 1 in advance.
In particular, by providing the reflecting member 51 in the mold 1 and measuring the temperature at a plurality of locations inside the mold 1, an accurate temperature distribution can be grasped, and local overheating and temperature of the mold 1 can be obtained. The occurrence of the deterioration can be prevented more surely.
Moreover, since the thermocouple 9 is used as the temperature measuring means for the surface 11a and the cavity surface 11b of the inner mold 11, the temperature can be measured easily and accurately.

Note that the propagation time from the surface 11a of the inner mold 11 to the first reflecting member 51a, the propagation time from the first reflecting member 51a to the second reflecting member 51b, and the cavity from the second reflecting member 51b calculated in step S11 are calculated. Based on the propagation time to the surface 11b, the heat quantity of the mold in each range can be calculated, and the heat quantity distribution in the whole mold 1 can be obtained.
Thus, by obtaining the heat quantity distribution in the mold 1, it is possible to grasp the necessary cooling amount in each part in the mold 1, and to achieve directional solidification by performing appropriate temperature control. It becomes possible.
Further, even when the reflecting member 51 is not provided as in the first embodiment, the thermocouple 9 is installed on the surface 11 a of the inner mold 11 and the temperature measured by the thermocouple 9 and the ultrasonic sensor 5 are used. It is also possible to predict the temperature of the cavity surface 11b by linearly approximating the temperature distribution in the mold 1 from the average temperature of the mold 1 obtained using the propagation time of the irradiated ultrasonic waves. .

1 is a schematic diagram showing a mold calorimeter and a mold temperature control apparatus according to the present invention. It is a figure which shows the flow of the temperature control method of a metal mold | die. It is a schematic diagram which shows 2nd embodiment of a metal mold | die temperature control apparatus. It is a figure which shows the flow of the temperature control method of the metal mold | die concerning 2nd embodiment.

DESCRIPTION OF SYMBOLS 1 Mold 3 Mold calorie measuring device 4 Cooling water amount control device 5 Ultrasonic sensor 6 Cooling pipe 8 Molten metal 11 Inner mold 11a Surface 11b Cavity surface 12 Outer mold

Claims (10)

When casting a molded product by solidifying the molten metal filled in the mold,
The die table surface or al ultrasonic irradiation,
In the ultrasonic wave propagation path between the mold surface and the cavity surface, a reflection member that reflects a part of the ultrasonic wave is installed,
When calculating the amount of heat held by the entire mold ,
Measure the time until the irradiated ultrasonic wave reaches the reflecting member from the mold surface and the time until it reaches the cavity surface from the mold surface,
Based on the measured time, calculate the mold heat quantity between the mold surface and the reflective member, and the mold heat quantity between the reflective member and the cavity surface,
Using the calculated amount of heat for each mold, determine the heat distribution of the entire mold.
A method for calorimetric measurement of mold dies. A mold temperature control method for casting a molded product by solidifying a molten metal melt-filled in a mold,
Irradiating ultrasonic waves from an appropriate location on the mold surface or inside the mold, after the molten metal is melt-filled in the mold until the melt-filled molten metal solidifies;
A step of measuring in real time the time it takes for the irradiated ultrasonic wave to propagate through the inside of the mold from the surface of the mold or inside the mold to reach the cavity surface;
Calculating in real time the amount of heat held by the entire mold based on the measured time;
A step of controlling the temperature of the mold by cooling means provided in the vicinity of the mold in accordance with the calculated amount of heat;
The average temperature of the mold is calculated from the propagation time of the ultrasonic wave, and the mold temperature at the appropriate location on the mold surface or inside the mold is measured by the temperature measuring means installed at the appropriate location on the mold surface or inside the mold. Predicting the temperature distribution of the entire mold from the calculated average temperature of the mold and the measured mold surface or mold temperature at an appropriate location inside the mold,
A mold temperature control method comprising: The mold temperature control method includes:
Preset the heat amount change of the mold necessary for the molten metal filled in the cavity to solidify,
When the amount of change in the heat amount of the mold after filling the molten metal calculated in real time reaches the set heat amount change, the step of opening the mold is performed.
The mold temperature control method according to claim 2, further comprising: In the ultrasonic wave propagation path between the mold surface or an appropriate place inside the mold and the cavity surface, a reflecting member that reflects a part of the ultrasonic wave is installed,
Measure the time for the ultrasonic wave to reach the reflecting member from the appropriate location on the mold surface or inside the mold, and the time to reach the cavity surface from the appropriate location on the mold surface or inside the mold,
Calculate the mold average temperature between the appropriate part of the mold surface or inside the mold and the reflecting member, and the mold average temperature between the reflecting member and the cavity surface,
Using each mold average temperature calculated and the mold temperature of the mold surface and the cavity surface measured by the temperature measuring means, to determine the temperature distribution of the entire mold,
4. The mold temperature control method according to claim 2, wherein the mold temperature is controlled.   5. The mold temperature control method according to claim 2, wherein the temperature measuring means is a thermocouple. An ultrasonic irradiation means for irradiating an ultrasonic wave from an appropriate location on the surface of the mold or inside the mold when solidifying the molten metal melted and filled in the mold and casting a molded product;
A reflection member installed in an ultrasonic wave propagation path between the mold surface and the cavity surface, and reflecting a part of the irradiated ultrasonic wave;
A time measuring means for measuring the propagation time of the ultrasonic wave irradiated from the ultrasonic irradiation means in the mold,
A calculation means for calculating the amount of heat held by the mold based on the measured time,
By the time measuring means, the time until the ultrasonic wave reaches the reflecting member from the mold surface, and the time until the ultrasonic wave reaches the cavity surface from the mold surface,
Based on the measured time, the calculation means calculates the mold heat quantity between the mold surface and the reflecting member and the mold heat quantity between the reflecting member and the cavity surface, and calculates each mold heat quantity. Use to find the heat distribution of the entire mold,
A calorific value measuring apparatus for a mold. Ultrasonic irradiation means for irradiating ultrasonic waves from an appropriate location on the mold surface or inside the mold, after the molten metal is melt-filled in the mold and until the melt-filled molten metal is solidified,
A time measurement means for measuring in real time the time it takes for the ultrasonic wave irradiated from the ultrasonic irradiation means to propagate from the surface of the mold or from an appropriate location inside the mold to reach the cavity surface;
A calculation means for calculating in real time the amount of heat held by the entire mold based on the measured time;
A cooling means for controlling the temperature of the mold according to the calculated amount of heat,
The time until the ultrasonic wave irradiated by the ultrasonic irradiation means propagates from the surface of the mold or an appropriate location inside the mold to reach the cavity surface is measured in real time by the time measuring means. The amount of heat held by the entire mold based on the measured time is calculated in real time by the calculation means, and the temperature of the mold is controlled by the cooling means according to the calculated amount of heat,
The calculating means calculates the average temperature of the mold from the propagation time of the ultrasonic wave, and the temperature measuring means installed at an appropriate place inside the mold surface or inside the mold, the mold at an appropriate place inside the mold surface or inside the mold. Measure the mold temperature and predict the temperature distribution of the entire mold from the calculated average temperature of the mold and the measured mold surface or the mold temperature at the appropriate location inside the mold,
The mold temperature control apparatus characterized by the above-mentioned. The mold temperature control device is:
In the calculation means, the heat amount change of the mold necessary for the molten metal filled in the cavity to solidify is set in advance, and the change amount of the mold heat amount after the molten metal calculated in real time is the set heat amount change. The mold is opened,
The mold temperature control apparatus according to claim 7, wherein The mold temperature control device is:
It is installed in an ultrasonic wave propagation path between the mold surface or an appropriate place inside the mold and the cavity surface, and includes a reflecting member that reflects a part of the ultrasonic wave,
By the time measuring means, the time required for the ultrasonic wave to reach the reflecting member from the appropriate location on the mold surface or inside the mold, and the time required to reach the cavity surface from the appropriate location on the mold surface or inside the mold. Measure
By the calculating means, the mold average temperature between the mold surface or an appropriate place inside the mold and the reflecting member, and the mold average temperature between the reflecting member and the cavity surface are calculated,
Using each mold average temperature calculated and the mold temperature of the mold surface and the cavity surface measured by the temperature measuring means, to determine the temperature distribution of the entire mold,
The mold temperature control apparatus according to claim 7 or 8, wherein   The mold temperature control apparatus according to claim 7, wherein the temperature measuring unit is a thermocouple.

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