JP3144452B2 - Release agent spray device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spray device for spraying a mold release agent onto a molding surface of a die of a die casting machine.

[0002]

2. Description of the Related Art In a die casting machine, the temperature of a mold is an important factor that determines the quality and productivity of a casting. The inside of the mold is cooled by water, and a mold release agent is sprayed from the outside to cool the mold. The cooling temperature is controlled to stabilize the temperature of the mold. The release agent naturally has the original function of improving the releasability of the product.

[0003] As shown in FIG. 3, a large number of nozzles (3) are sprayed on both sides according to the shapes of a fixed mold (1) and a movable mold (2) constituting a mold. The spray body (4) attached to the mold is inserted between the fixed mold (1) and the movable mold (2) which are opened, and the spray body (4) is directed toward the molding surfaces of the fixed mold (1) and the movable mold (2). The release agent is sprayed all at once from the nozzle (3). The number of nozzles (3) to be used, the mounting position, the orientation, and the like are adjusted so that the release agent is applied to necessary portions of the fixed mold (1) and the movable mold (2).

Further, as shown in FIG. 4, a spray body (7) provided with several nozzles (6) on both sides is attached to the tip of an arm (5) of a robot (not shown), and the arm (5) is provided. In some cases, the spray body (7) is moved to a required location by moving the sprayer to spray the release agent.

[0005] The mold temperatures of the molding surfaces of the fixed mold (1) and the movable mold (2) are not always constant, differ for each casting, and also differ for each part of the molding surface. However, in the conventional spray device, since a predetermined amount of the release agent is sprayed from all the nozzles (3), a part that is insufficiently cooled or a part that is excessively cooled is mixed. Mold temperature is not stable, and product quality is not stable.

Further, as shown in FIG. 4, a spray body (7) having several nozzles (6) on both sides is attached to the tip of an arm (5) of a robot (not shown), and the arm (5) is provided. In some cases, the spray body (7) is moved to a required location by moving the sprayer to spray the release agent. Again,
Since the spray amount of the release agent from the nozzle (6) is constant,
Mold temperature is not stable.

Therefore, the mold temperature of the fixed mold (1) and the movable mold (2) is measured for each casting, and the spraying time of the release agent from each nozzle (3) of the spray body (4) is set to the mold temperature. There has been proposed an apparatus in which the overall mold temperature is stabilized by controlling the mold temperature accordingly.

For example, as described in JP-A-2-200366, a temperature distribution state detecting means is inserted between a fixed mold and a movable mold which are opened to check the temperature distribution state of both molding surfaces. The detected temperature distribution data is compared with the reference temperature distribution data set in advance for each product, and in the high temperature region where the detected temperature distribution data is higher than the reference temperature distribution data, The spray time of the corresponding nozzle is lengthened according to the temperature difference, and in the low temperature region where the detected temperature distribution data is lower than the reference temperature distribution data, the spray time of the nozzle corresponding to the low temperature region is shortened according to the temperature difference. A spray device for controlling the spraying has been proposed.

[0009]

In the above-mentioned spray device, the mold temperature of the fixed mold (1) and the movable mold (2) is detected at a plurality of positions for each casting, and the spray body (4) is detected in accordance with the temperature distribution. Since the spray amount of the release agent from the nozzle (3) is controlled, the mold temperatures of the fixed mold (1) and the movable mold (2) are stabilized over the entire area, and the quality of the product is stabilized.

However, in the above-mentioned spray device, a large number of nozzles (3) are used in the spray main body (4), and the nozzles (3) are arranged so as to be at an optimum position according to the product shape. Therefore, when the product shape changes, the number and arrangement of the nozzles (3) to be used must be rearranged in an optimum state. However, there are a large number of nozzles (3), and the arrangement must be set while conducting experiments many times, and the setting operation is very troublesome.

An object of the present invention is to provide a spray apparatus which can easily change the spray position and the spray time of the release agent in accordance with the change of the product and stabilize the mold temperature.

[0012]

A spray apparatus according to the present invention comprises: a mold temperature measuring means for measuring mold temperatures at a plurality of positions on a molding surface of a fixed mold or a movable mold constituting a mold of a die casting machine; Spray body having a nozzle capable of locally spraying, a robot having the spray body attached to the tip of an arm, and operating the arm of the robot to move the nozzle to a plurality of mold temperature measurement points of the mold. And a control means for controlling the spraying time of the release agent at each spray position in accordance with the mold temperature measured at each mold temperature measurement point .

As a mold temperature measuring means, a thermocouple is incorporated in at least one of a fixed mold and a movable mold to directly measure a fixed or movable mold temperature.

[0014]

In the above spray apparatus, the spray body is moved by a robot, the spray body is inserted between the fixed type and the movable type which are opened, and the nozzle provided on the spray body is fixed or movable. The spraying device sprays the release agent from the nozzle while moving toward the molding surface and moving to a plurality of locations on the molding surface.Moreover, in the portion where the spray amount of the release agent needs to be changed, Since the spraying time of the release agent from the nozzle is controlled in accordance with the measured mold temperature, the mold temperature for each casting is stabilized, and the product quality is stabilized.

In addition, the spray position of the release agent can be changed in accordance with the change of the product shape only by changing the operation of the arm of the robot without changing the spray body and by changing the spray time from the nozzle.

In addition, since a thermocouple is buried in at least one of the fixed type and the movable type to directly measure the temperature of the fixed or movable type, the temperature of the mold is immediately obtained, and the process for measuring the temperature of the mold is performed. Is unnecessary, and the work of applying the release agent can be performed in a short time.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the embodiment, the spray amount is changed at two positions. However, this is only a part of the die casting machine, and the spray amount is actually changed at many positions.

As shown in FIG. 1, the die of the die casting machine is composed of a fixed mold (1) and a movable mold (2), and the movable mold (2) is a mold clamping means ( (Not shown)
Is opened and closed.

A spray device for spraying a release agent onto the molding surfaces of the fixed mold (1) and the movable mold (2) is a mold temperature measuring means (10) for measuring the mold temperature of the fixed mold (1) and the movable mold (2). ), A spray body (11), a working robot (not shown), and a control means (12).

The mold temperature measuring means (10) sets thermocouples (A) (A) (A) at points (PA) and (PB) at which the spray amount of the fixed mold (1) should be changed or at points representing the temperatures of several spray points. B) is buried from the back side and each point (P
A) The control means (1) controls the thermoelectromotive force according to the mold temperature of (PB).
2). Thermocouple (A) (B)
The embedding number and embedding position are appropriately set according to the shape of the product. The thermocouples (A) and (B) may be provided on the movable mold (2) side. When the temperature distribution of the mold temperature is largely different between the fixed mold (1) and the movable mold (2), a thermocouple is appropriately embedded in the fixed mold (1) and the movable mold (2), and the thermoelectromotive force is generated. May be transmitted to the control means (12).

On the other hand, the spray body (11) is attached to the tip of the robot arm (13), and two nozzles (14) capable of locally spraying the release agent are attached to both sides. The number of nozzles (14) may be three or more as long as local release of the release agent is possible. Although not shown, a release agent supply source is connected to the spray body (11), and the release agent is supplied from the release agent supply source to the spray body (11) by a control signal of the control means (12). Is sprayed from the nozzle (14).

The control means (12) is programmed to control the operation of the robot, spray the release agent from the nozzle (14), and control the spray time. As shown in FIG. 2A, for example, as shown in FIG. 2A, when the mold is opened, the robot control program starts and moves the arm (13) to move the nozzle (14) to the fixed type (1). And the movable mold (2), and sequentially moved to a spraying position along a predetermined trajectory, and the nozzle (1) is used for a minimum spraying time, for example, 1.0 second by a timer.
Spray the release agent from 4). Next, when the nozzle (14) moves to the point (PA) at which the spray amount is changed, the release agent is sprayed from the nozzle (14) and the timer (T)
A) starts the operation, and when the set time has elapsed, the spraying is stopped. Next, when the nozzle (14) moves to the next point (PB), the release agent is sprayed from the nozzle (14), and at the same time, the timer (TB) starts operating, and when the set time has elapsed, the spray is stopped. Point (PA) (PB)
When the spraying is completed, the nozzle (14) is fixed (1).
It escapes from between the movable mold (2) and returns to the original position.

The setting of the operation time of the timer (TA) and the timer (TB) is selected by a temperature control sequence. In the temperature control sequence, the thermoelectromotive force from one thermocouple (A) incorporated in the fixed mold (1) is transmitted to the timer switching control unit (15A), and the mold temperature corresponding to the thermoelectromotive force is obtained. Then, a timer value according to the obtained mold temperature is selected and transmitted to the timer (TA) of the robot control program. The thermoelectromotive force from the other thermocouple (B) incorporated in the fixed type (1) is changed by the timer switching control unit (15).
B), the mold temperature corresponding to the thermoelectromotive force is obtained, a timer value corresponding to the obtained mold temperature is selected, and the timer value is transmitted to the timer (TB) of the robot control program. As shown in FIG. 2B, at the point (PA) corresponding to the thermocouple (A), 150 ° C. and 250 ° C. are set as switching reference temperatures, and the timer (TA) time is set to 2.0 seconds.
The time is set to 3.0 seconds and 4.0 seconds, and a time corresponding to the measured mold temperature is selected. In addition, at the point (PB) corresponding to the thermocouple (B), the switching reference temperature is set to 100 seconds and 200 degrees Celsius as 1.0 second, 2.0 seconds, and 3.0 seconds. Select a time corresponding to. For these points, the reference temperature, the set time, and the like, optimal values are obtained by conducting experiments in advance.

The spray device is provided with a robot arm (1) according to a program incorporated in the control means (12).
3) is moved according to the operation sequence taught in advance, and the nozzle (14) provided at the tip of the arm (13) is fixed (1).
Then, the mold is directed toward the molding surface of the movable mold (2) and sequentially moved to a plurality of positions, and a predetermined amount of the release agent is sprayed at each moving point. At points (PA) and (PB), the release agent is sprayed from the nozzle (14) for a predetermined time according to the mold temperature measured by the mold temperature measuring means (10), and the fixed mold (1) and the movable mold (2) are sprayed. ) Stabilize the whole mold temperature.

When three or more points for changing the spray amount are set, a thermocouple is installed at a position corresponding to the point, and the mold temperature at each point is measured. On the other hand, a timer for setting the spray time at each point is added to the robot control program of the control means (12), and a timer switching control unit for selecting the operation time of the added timer is added to the temperature control sequence.

When the product shape changes, the optimum mold temperature measurement position for the product shape is selected, and the arrangement of the thermocouple, the setting of the timer, and the control program of the robot may be changed accordingly.

[0027]

According to the present invention, by operating the robot, the spray body is inserted between the fixed mold and the movable mold that are opened, and the nozzle provided on the spray body is fixed or movable. The release agent is sprayed from the nozzle toward the molding surface and while moving to a plurality of locations on the molding surface. In addition, the spray device controls the spraying time of the release agent from the nozzle to the part according to the fixed or movable mold temperature measured by the mold temperature measuring means, so that the mold temperature for each casting is fine and stable In addition, it is possible to stably produce high quality products. Therefore, the life of the die of the die casting machine is prolonged, and the period of the periodic maintenance work can be extended.

Also, when changing the spraying point of the release agent with the change of the product shape, the program for moving the robot arm and the program for setting the spraying time from the nozzle are changed without changing the spray body. And can be changed easily.

Further, since a thermocouple is buried in at least one of the fixed type and the movable type to directly measure the temperature of the fixed or movable type, the temperature of the mold is immediately obtained, and the process for measuring the temperature of the type is performed. Is not required, the application of the release agent can be performed in a short time, the cycle time of casting can be shortened, and the productivity is improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a spray device according to the present invention.

FIG. 2 is a drawing showing a control program for a spray device according to the present invention.

FIG. 3 is a side view of a conventional spray device.

FIG. 4 is a side view of a conventional spray device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed type 2 Movable type 10 Temperature measuring means 11 Spray main body 12 Control means 13 Arm 14 Nozzle A, B Thermocouple

Claims (2)

(57) [Claims] 1. A mold for a die casting machine, comprising: a mold temperature measuring means for measuring a mold temperature at a plurality of locations on a molding surface of a fixed or movable mold; and a nozzle capable of locally spraying a release agent. A spray body, a robot having the spray body attached to the tip of an arm, and an arm of the robot being operated to move the nozzle sequentially to a plurality of mold temperature measurement points of the mold to spray the release agent. And a control means for controlling the spraying time of the release agent at each spray position in accordance with the mold temperature measured at each mold temperature measurement point . 2. The mold release agent according to claim 1, wherein a mold temperature measuring means having a thermocouple incorporated in at least one of a fixed mold and a movable mold constituting a mold of the die casting machine is used. Spray device.