JPH0337827B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in a spray device for spraying a mold release agent onto molding surfaces of both a fixed mold and a movable mold constituting a mold of a die-casting machine.

(Prior art) Conventionally, when casting a product using a die-casting machine, from the viewpoint of improving the quality of the product and preventing seizure, after taking the product out of the mold,
Generally, the mold temperature of the mold is stabilized by spraying a mold release agent onto the molding surfaces of both the fixed mold and the movable mold constituting the mold by operating a spray device.

As such a spray device, for example, as disclosed in JP-A-63-130243, the current mold temperature and stable casting temperature, and the current mold temperature and the mold temperature one shot before are compared. By this,
It is known that a timer time required for the next spraying of the mold release agent is determined so as to maintain the mold temperature of the mold at a stable casting temperature, and the mold release agent is sprayed based on this timer time.

(Problem to be Solved by the Invention) Generally speaking, the mold temperature of a mold is not uniform over the molding surfaces of both the fixed mold and the movable mold. Since there are temperature differences in each part depending on the shape of the product, the time required for the mold temperature to return to the set temperature at each part of the molding surface of both the fixed mold and the movable mold, which has been lowered by spraying the mold release agent, is It becomes distinct. On the other hand, from the perspective of increasing the efficiency of the casting cycle time, when starting the next casting, the mold temperature at each part of the molding surface of both the fixed mold and the movable mold should be quickly and within a certain period of time brought to each set temperature. It is desirable to reinstate it.

However, in the spray device of the above-mentioned publication example, only one temperature sensor is provided to detect the mold temperature of the mold, and therefore, the temperature of the entire mold is determined based on the mold temperature of a specific area of the mold. Since it is only necessary to set the spray time of the mold release agent, it is possible to quickly return the mold temperature, which has a temperature difference between each part of the molding surface of the fixed mold and the movable mold, to the set temperature within a certain period of time. I can't do it.

Therefore, by providing as many temperature sensors as the number of spray nozzles that spray the mold release agent,
The mold temperature at each part of the fixed and movable molding surfaces of the mold is individually detected, and based on the detected mold temperature of each part, the mold temperature that has a temperature difference at each part of the two molding surfaces is quickly and It is conceivable to individually set the spraying time of the mold release agent from each of the spray nozzles so that the temperature returns to each set temperature within a certain period of time. However, in this case, it is undeniable that a large number of temperature sensors are required and the structure for mounting the temperature sensors to the mold becomes complicated.

This invention has been made in view of the points related to the present invention, and its purpose is to eliminate the need to attach a temperature sensor to the mold by adopting an appropriate mold temperature detection means in place of the temperature sensor described above, and to The object of the present invention is to quickly return mold temperatures, which have temperature differences between the molding surfaces of a fixed mold and a movable mold, to their respective set temperatures within a certain period of time.

(Means for Solving the Problem) In order to achieve the above object, the solution of the present invention is a spray device that sprays a mold release agent onto the molding surfaces of both the fixed mold and the movable mold that constitute the mold of a die-casting machine. In this case, the spray device main body is provided so as to be movable forward and backward between the fixed mold and the movable mold in an open mold state. Furthermore, a plurality of spray nozzles are provided in the spray device main body, and when the spray device main body moves forward, each of the spray nozzles is positioned opposite to both the molding surfaces of the fixed mold and the movable mold so as to cover the entire molding surfaces. Then, spray the above-mentioned mold release agent. Further, the temperature distribution state detection means is provided so as to be movable forward and backward between the fixed mold and the movable mold in the mold open state, and when the product is taken out, the temperature distribution state detection means is moved forward and backward between the fixed mold and the movable mold. The temperature distribution state over the entire molding surface is detected by moving the molding surface. In addition, from the temperature distribution data detected by the temperature distribution state detection means, only data corresponding to reference temperature distribution data that has been set in advance by dividing each product into a plurality of temperature regions is selected, and the selected temperature is The distribution data is compared with the reference temperature distribution data, and in a high temperature region where the selected temperature distribution data is higher than the reference temperature distribution data, the release agent spraying time of each of the spray nozzles corresponding to the high temperature region is determined by the temperature difference. On the other hand, in a low temperature region where the selected temperature distribution data is lower than the reference temperature distribution data, the release agent spraying time of each of the above spray nozzles corresponding to the low temperature region is shortened according to the temperature difference. Control means shall be provided to control the

(Function) With the above configuration, in the present invention, when the fixed mold and the movable mold constituting the mold of the die casting machine are in an open state, the spray device main body is moved forward between the fixed mold and the movable mold, A plurality of spray nozzles provided on the spray device main body are positioned opposite to both the molding surfaces of the fixed mold and the movable mold,
A mold release agent is sprayed over both molding surfaces. In this case, the temperature distribution state over the entire molding surfaces of both the fixed mold and the movable mold after the product is taken out is detected by a temperature distribution state detection means that is moved forward between the fixed mold and the movable mold. This detected temperature distribution data is then input to the control means, where only the data corresponding to the reference temperature distribution data that has been set in advance by dividing into a plurality of temperature regions for each product is selected. The selected temperature distribution data is compared with the reference temperature distribution data, and in a high temperature region where the selected temperature distribution data is higher than the reference temperature distribution data, the release agent is sprayed from each of the spray nozzles corresponding to the high temperature region. While the time is increased according to the temperature difference, in a low temperature region where the selected temperature distribution data is lower than the reference temperature distribution data, the release agent spraying time of each of the above spray nozzles corresponding to the low temperature region is increased depending on the temperature difference. It is controlled to be shortened accordingly.

In this way, the temperature distribution state over the entire molding surface of both the fixed mold and the movable mold is detected by the temperature distribution state detection means, and the temperature distribution state is detected by the temperature distribution state detection means, and the temperature distribution state is detected by the temperature distribution state detection means, and the temperature distribution state is detected by the temperature distribution state detection means, and the temperature distribution state is detected by the temperature distribution state detection means. ,
The release agent spraying time of each spray nozzle is controlled based on the temperature difference between the detected temperature distribution data and the data selected corresponding to the reference temperature distribution data. The need for attachment to a fixed mold and a movable mold is eliminated, and the mold temperature, which has a temperature difference in each part of the molding surfaces of the fixed mold and movable mold, is quickly returned to the set temperature of each part within a certain time. becomes.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 4 shows a spray device A according to an embodiment of the present invention.
A fixed mold 1 and a movable mold 2 are shown, which constitute a mold B of a die casting machine equipped with a fixed die plate 1 and a movable die plate 1, respectively.
b, 2b. The spray device A is equipped with a rectangular parallelepiped-shaped spray device main body 4 attached to the tip (lower end) of a piston rod 3a extending downward from the fluid pressure cylinder 3. It is provided so as to be able to move forward and backward in the vertical direction between the fixed mold 1 and the movable mold 2, which are in an open state when activated. Further, on both sides of the spray device main body 4, as shown in enlarged detail in FIG. 5, a plurality of spray nozzles 5, 5, . Each spray nozzle 5 is connected to a release agent supply source and a pressurized air supply source (not shown) via respective switching valves. Note that these switching valves are collectively represented as a valve group 6 in FIG. When the spray device main body 4 is moved forward downward by the extension operation of the fluid pressure cylinder 3, each of the spray nozzles 5 is placed in a position facing both the molding surfaces 1a and 2a of the fixed mold 1 and the movable mold 2. In this state, the valve group 6
By opening each switching valve on the side of the mold release agent supply source, the fixed mold 1 and the movable mold 2 are
After spraying a mold release agent onto both molding surfaces 1a, 2a and cooling both molding surfaces 1a, 2a to a predetermined temperature, each switching valve on the pressurized air supply source side of the valve group 6 is then By operating the opening operation, pressurized air is blown onto both the molding surfaces 1a and 2a of the fixed mold 1 and the movable mold 2, thereby eliminating uneven spraying of the mold release agent and removing residual moisture on the molding surfaces 1a and 2a. It is designed to do this.

Further, between the fixed mold 1 and the movable mold 2 in the mold open state, a chuck device (not shown) for taking out the product is provided so as to be movable horizontally.
As shown in FIG. 3, the chuck device is equipped with an infrared video camera 7 as temperature distribution state detection means.
is supported so that it can move forward and backward in the horizontal direction together with the chuck device. When the chuck device takes out the product, the infrared video camera 7 is moved forward between the fixed mold 1 and the movable mold 2 to detect the temperature distribution over the entire molding surfaces 1a and 2a. is being done.

Further, the infrared video camera 7 is input-connected to a control means 8, as shown in FIG. The control means 8 includes a temperature value conversion circuit 9 that converts the temperature distribution over the entire molding surfaces 1a and 2a of the fixed mold 1 and the movable mold 2 into temperature values, and a temperature value conversion circuit 9 that converts the temperature distribution over the entire molding surfaces 1a and 2a of the fixed mold 1 and the movable mold 2 into temperature values, and a temperature value conversion circuit 9 that converts the temperature distribution data into temperature values as shown in FIG. The reference temperature setting circuit 10 is divided and set in advance into a plurality of temperature ranges (four ranks) for each product, and the temperature distribution data numerically converted by the temperature numerical value conversion circuit 9 is set in the reference temperature setting circuit 10. A mask circuit 11 selects and passes only data corresponding to the set reference temperature distribution data, and the selected temperature distribution data from the temperature numerical value conversion circuit 9 outputted through the mask circuit 11 is used as the reference. A comparison circuit 12 compares it with the reference temperature distribution data set by the temperature setting circuit 10 and outputs the temperature difference, and upon receiving the output signal from the comparison circuit 12, molding of both the fixed mold 1 and the movable mold 2 is performed. an arithmetic circuit 13 that calculates the release agent spray time from each of the spray nozzles 5 corresponding to the temperature difference between each part of the surfaces 1a and 2a; and the arithmetic circuit 1
3, in a high temperature region where the selected temperature distribution data is higher than the reference temperature distribution data, the release agent spraying time of each spray nozzle 5 corresponding to the high temperature region is adjusted according to the temperature difference. On the other hand, in a low temperature region where the selected temperature distribution data is lower than the reference temperature distribution data, the release agent spraying time of each spray nozzle 5 corresponding to the low temperature region is shortened according to the temperature difference. The mold release agent spraying time setting circuit 14 is configured to switch and control each switching valve of the valve group 6 based on the set value of the mold release agent spraying time setting circuit 14.

Therefore, the control means 8 selects, from the temperature distribution data detected by the infrared video camera 7, only data that corresponds to reference temperature distribution data that has been set in advance by dividing each product into a plurality of temperature regions. , the selected temperature distribution data is compared with the reference temperature distribution data, and in a high temperature region where the selected temperature distribution data is higher than the reference temperature distribution data, the separation of each of the spray nozzles 5 corresponding to the high temperature region is determined. The mold release agent spraying time is lengthened according to the temperature difference, while in a low temperature region where the selected temperature distribution data is lower than the reference temperature distribution data, the mold release agent spraying time of each spray nozzle 5 corresponding to the low temperature region is increased. The length is shortened depending on the temperature difference.

Next, the operation of the spray device A according to the above embodiment will be explained based on the flowchart of FIG. 2 together with the procedure for casting a product.

First, in step _S1 after the start, it is determined whether mold B of the die-casting machine has been clamped.
If the determination is YES, the process proceeds to step _S2 , where the molten metal is injected into the cavity of the mold B to cast the product, while if the determination is NO, the process waits until the mold is clamped.

Next, in step _S3 , it is determined whether the mold B has been opened. If this determination is YES, the process proceeds to step _S4 , in which the chuck device and the infrared video camera 7 are moved forward together between the fixed mold 1 and the movable mold 2 that constitute the mold B, and the chuck device While the product is chucked and removed from the mold, if the determination is NO, it is assumed that casting is not completed and the process returns to step _S2 , where it waits until the mold is opened.

Thereafter, in step _S5 , it is determined whether the infrared video camera 7 has detected the mold temperature over the entire molding surfaces 1a, 2a of the fixed mold 1 and the movable mold 2. If this judgment is YES, step
Proceeding to _S6 , the temperature difference between the reference temperature distribution data and the data selected from the detected temperature distribution data corresponding to the reference temperature distribution data is determined. Then, in step _S7 , it is determined whether the selected temperature distribution data is higher than the reference temperature distribution data. This judgment is YES if the selected temperature distribution data is in a high temperature area higher than the reference temperature distribution data.
In this case, the process proceeds to step _S8 , where the mold release agent spraying time (t) of each spray nozzle 5 corresponding to the high temperature region is lengthened so that, for example, t=t ₁ +α, according to the temperature difference, and the determination is made. is a low temperature region where the selected temperature distribution data is lower than the reference temperature distribution data NO
In this case, the process proceeds to step _S9 , and the mold release agent spraying time (t) of each spray nozzle 5 corresponding to the low temperature region is shortened so that, for example, t= _t1 -α, according to the temperature difference. The release agent spraying time (t) is set at . Thereafter, the process proceeds to step _S10 , where both the chuck device and the infrared video camera 7 are moved backward. On the other hand, if the determination at step _S5 is NO, the process waits until the mold temperatures of both molding surfaces 1a and 2a are detected.

Thereafter, in step _S11 , it is determined whether the spray device main body 4 of the spray device A has moved forward between the fixed mold 1 and the movable mold 2. This judgment
If YES, proceed to step S ₁₂ and proceed to step S ₈
After spraying the mold release agent from each spray nozzle 5 onto both molding surfaces 1a and 2a for a predetermined time based on the mold release agent spraying time (t) set in step _S9 , the process proceeds to step _S13 . Next, pressurized air is sprayed to complete the spraying operation, and then, in step _S14 , the spray device main body 4 is moved backward, and the process returns to step _S1 . On the other hand, if the determination at step _S11 is NO, the process waits for the spray device main body 4 to move forward.

As described above, in this embodiment, the infrared video camera 7 detects the temperature distribution state over the entire molding surfaces 1a and 2a of both the fixed mold 1 and the movable mold 2 that constitute the mold B of the die-casting machine, and Based on the temperature difference between the reference temperature distribution data set in advance by dividing into a plurality of temperature regions and the data selected from the detected temperature distribution data corresponding to the reference temperature distribution data, the temperature of each spray nozzle is determined. Since the release agent spraying time (t) was controlled,
It is possible to eliminate the need to attach a temperature sensor to the fixed mold 1 and the movable mold 2 of the mold B, and to quickly and quickly measure the temperature of the mold having a temperature difference at each part of the molding surfaces 1a and 2a of the fixed mold 1 and the movable mold 2. Each set temperature can be returned to within a certain period of time.

(Effects of the Invention) As explained above, according to the present invention, the temperature distribution state over the entire molding surfaces of both the fixed mold and the movable mold after the product is taken out is detected by the temperature distribution state detection means, and the detected temperature distribution state is detected by the temperature distribution state detection means. From the temperature distribution data, select only the data that corresponds to the reference temperature distribution data that has been divided into multiple temperature regions and set in advance for each product, compare this selected temperature distribution data with the above reference temperature distribution data, and In a high temperature region where the selected temperature distribution data is higher than the reference temperature distribution data, the release agent spraying time of each of the spray nozzles corresponding to the high temperature region is lengthened according to the temperature difference;
In a low temperature region where the selected temperature distribution data is lower than the reference temperature distribution data, the release agent spraying time of each of the spray nozzles corresponding to the low temperature region is controlled to be shortened in accordance with the temperature difference. Therefore, it is not necessary to attach a temperature sensor to the mold, and the mold temperature, which has temperature differences at various parts of the molding surface of the mold, can be quickly returned to each set temperature within a certain period of time. .

[Brief explanation of drawings]

Fig. 1 is a control block diagram of a spray device according to an embodiment of the present invention, Fig. 2 is a flowchart showing the operation of the spray device together with the procedure for casting a product, and Figs. A schematic configuration diagram of the mold with the spray device main body positioned between the fixed mold and the movable mold,
FIG. 5 is a side view of the main body of the spray device showing the arrangement of the spray nozzles, and FIG. 6 is a data diagram illustrating the reference temperature distribution data of the product. 1... Fixed type, 2... Movable type, 1a, 2a...
Molding surface, 4... Spray device main body, 5... Spray nozzle, 7... Infrared video camera (temperature distribution state detection means), 8... Control means, A... Spray device, B... Mold.

Claims (1)

[Claims] 1. A spray device that sprays a mold release agent onto both the molding surfaces of a fixed mold and a movable mold that constitute the mold of a die-casting machine, and is installed movably back and forth between the fixed mold and the movable mold in an open state. a spray device main body, and a mold release device provided on the spray device main body, which is positioned opposite to both the molding surfaces of the fixed mold and the movable mold and extends over the entire molding surfaces of the fixed mold and the movable mold when the spray device main body moves forward. A plurality of spray nozzles for spraying the agent are provided so as to be movable forward and backward between the fixed mold and the movable mold in the mold open state, and when the product is taken out, the spray nozzles are movable forward and backward between the fixed mold and the movable mold. temperature distribution state detection means for detecting the temperature distribution state over the entire molding surface; and a reference temperature that is preset for each product by dividing it into a plurality of temperature regions based on the temperature distribution data detected by the temperature distribution state detection means. Select only the data corresponding to the distribution data, compare this selected temperature distribution data with the reference temperature distribution data, and if the selected temperature distribution data is higher than the reference temperature distribution data, the high temperature region The mold release agent spraying time of each of the above-mentioned spray nozzles corresponding to the above is lengthened according to the temperature difference, while in a low-temperature region where the selected temperature distribution data is lower than the reference temperature distribution data, each of the above-mentioned spraying corresponding to the low-temperature region is 1. A spray device comprising: control means for controlling a release agent spraying time of a nozzle to be shortened according to a temperature difference.