JP2015150617A - Metallic mold spray method, and metallic mold spray system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a metallic mold spray method and a metallic mold spray system which can spray the individual portions of an inner-mold surface with quantities according to the temperatures of the portions.SOLUTION: The inner face of a mold 1 is divided in advance into a plurality of blocks, and a spray head 5 is sprayed with a mold parting agent while sequentially moved to the individual blocks. By a non-contact thermometer 7 mounted on the spray head 5, the mold temperature of the target block is measured, and the block is sprayed in a discharge pattern according to the mold temperature measured. After this, the action to move to a next block is repeated. The discharge pattern is previously set.

Description

  The present invention relates to a mold spray method and a mold spray system for automatically spraying a release agent on the inner surface of a mold such as a die casting machine.

  An apparatus for automatically spraying a release agent on the inner surface of a die casting mold has been widely used. Since the spray amount of the mold release agent causes the mold temperature to change, a technique for measuring the mold temperature and controlling the spray amount has been developed, and is disclosed in Patent Document 1, Patent Document 2, and the like. .

  However, in the mold spray systems described in these patent documents, the internal temperature of the mold is measured by one or a plurality of thermometers embedded in the mold, so the representative temperature of the mold and its fluctuation tendency However, the temperature of the entire inner surface of the mold cannot be accurately detected. For this reason, the temperature of the part where the mold thermometer is not embedded must be estimated from the representative temperature, and the spray amount cannot be optimally controlled according to the part of the mold.

  Recently, an infrared camera is installed in the vicinity of the die casting machine to measure the surface temperature of the mold when the mold is opened, and to control the spray amount according to the measured mold temperature. Yes. However, since the infrared camera is installed outside the die casting machine, the image is a distorted image obtained by photographing the mold surface from an oblique direction. Therefore, depending on the mold shape, there may be a portion where the spray amount cannot be optimally controlled.

Japanese Patent Laid-Open No. 3-71933 JP-A-10-193070

  Accordingly, the object of the present invention is to solve the above-mentioned conventional problems and provide a novel mold spray method and mold spray system capable of spraying each part of the inner surface of the mold in an amount corresponding to the temperature. It is to be.

  In the mold spray method of the present invention made to solve the above problems, the inner surface of the mold is divided into a plurality of blocks in advance, and the mold release agent is sprayed while the spray head is sequentially moved to each block. This is a mold spray method, in which the mold temperature of the destination block is measured by a non-contact thermometer mounted on the spray head, and the block is sprayed with a discharge pattern corresponding to the measured mold temperature. Thereafter, the operation of moving to the next block is repeated. According to the second aspect of the present invention, the ejection pattern can be obtained by changing the pulse spray interval from the spray head in accordance with the mold temperature.

  Also, a mold spray system of the present invention made to solve the above-mentioned problems is a spray head equipped with a spray nozzle for a release agent and a non-contact thermometer, and a mold for which the spray head is set in advance. A robot arm that sequentially moves to each block on the inner surface, and an arithmetic device that controls the discharge pattern of the spray head according to the mold temperature of the destination block measured by a non-contact thermometer To do. In addition, as described in claim 4, the spray head preferably has a pulse spray function of intermittently discharging the release agent.

  According to the mold spray method and the mold spray system of the present invention, the inner surface of the mold is divided into a plurality of blocks in advance, and the spray head equipped with a non-contact thermometer is sequentially moved to each block while the temperature is changed. Measurement and spraying with a discharge pattern according to the mold temperature are repeated. In the present invention, since the temperature of the inner surface of the mold can be measured from a close distance and from the front of the mold, an amount of spray according to the temperature of each part of the mold can be performed. In addition, the temperature is measured in a short time from when the spray head moves to the destination block until spraying starts, so even when starting up a die casting machine where the mold temperature is not stable, the optimum amount is always maintained. Spraying can be performed.

1 is an overall view showing an embodiment of the present invention. It is a typical sectional view showing an embodiment of the present invention. It is explanatory drawing which shows the example which divided | segmented the metal mold | die into several blocks. It is a flowchart which shows embodiment of this invention.

Hereinafter, preferred embodiments of the present invention will be described.
1 and 2, reference numeral 1 denotes a die of a die casting machine. The right side of FIG. 1 is a fixed side die 1, and the left side is a movable side die 1 that reciprocates along a guide rod 2. A spray robot 3 is installed on the side of the die casting machine, and a spray head 5 is supported at the tip of the robot arm 4. As shown in FIG. 2, when the molds 1, 1 of the die casting machine are opened, the spray head 5 is moved between the molds 1, 1 by the robot arm 4, and a release agent is placed on the surfaces of the molds 1, 1. It is the same as before to spray automatically.

  The spray head 5 includes a spray nozzle 6 and a built-in electromagnetic valve for performing pulse spraying. Further, unlike the conventional product, the spray head 5 is equipped with a non-contact thermometer 7. The solenoid valve is opened and closed by a control device (not shown) at a cycle of, for example, 0.1 seconds, and pulsed spraying is performed by turning on and off the compressed air supplied to the spray nozzle 6. However, as will be described later, the ON / OFF time and the duration thereof can be changed in various ways, and therefore the spray amount can be freely changed.

  The non-contact thermometer 7 is an infrared thermometer called a thermo camera, and its main body is housed inside the spray head 5, and only the light receiving lens portion is exposed to the outside of the spray head 5. The light receiving lens is set in the same direction as the spray nozzle 6. The detection signal of the non-contact thermometer 7 is output to an arithmetic device installed outside. However, it is also possible to reduce the size of the arithmetic unit and store it inside the spray head 5. Thus, in the present invention, since the non-contact thermometer 7 is attached to the spray head 5, unlike the prior art, the temperature of the inner surface of the mold can be accurately measured from a close distance and from the front. The non-contact thermometer 7 can use a commercial item.

  In this embodiment, as shown in FIG. 2, the spray head 5 sprays from the center of the molds 1 and 1 to both sides, so that the spray head 5 has a spray nozzle 6 and a non-contact thermometer 7 on each of both surfaces. I have. However, this point is not an essential requirement of the present invention, and the spray nozzle 6 and the non-contact thermometer 7 can be provided only on one side of the spray head 5 and spraying can be performed on each side.

  In the present invention, the inner surface of the mold 1 is divided into a plurality of blocks in advance, and the release agent is sprayed while the spray head 5 is sequentially moved to each block. FIG. 3 is an explanatory diagram of an example. In this example, the inner surface of the mold 1 is divided into seven blocks, and the spray head 5 is sequentially moved by the robot arm 4 in the order indicated by the arrows. The number of divisions may be set as appropriate according to the type, size, and shape of the mold 1. In addition, since it is necessary to perform the movement and spray to all the blocks during the opening time of the mold 1, the stop time of the spray head 5 in each block is about several seconds.

  As shown in the flow in FIG. 4, when the spray head 5 stops at the destination block, first, the temperature T of the surface of the mold 1 of the block is set from the closest distance by the non-contact thermometer 7 and the front of the mold 1. Measure accurately from TP1 to TP7 shown in FIG. 3 mean temperature measurement points. Then, the temperature measurement value is compared with the standard value, and when it matches with the standard value, the release agent is sprayed from the spray nozzle 6 with the standard discharge pattern, but when it is out of the standard value, it is corrected. The release agent is sprayed based on the discharged pattern. These discharge patterns are set for each block and for each temperature difference as shown in Table 1 below.

  The specific numerical values vary depending on the size of the mold 1 and the operating temperature. For example, assuming that 0.1 second injection and 0.1 second stop are standard patterns, 0 is obtained when the mold temperature is lower than the standard value. It is sufficient to change the pulse spray timing setting such as 0.3 second injection and 0.3 second stop when the mold temperature is higher than the standard value and 0.3 second injection and 0.1 second stop. Even if the deviation from the standard value is the same, the correction amount of the ejection pattern can be adjusted by the block. It is also possible to change the duration of the pulse spray.

  The above-described measurement of the mold temperature and spraying of the release agent with the discharge pattern corresponding thereto are performed for each block on the mold surface. The discharge pattern of the spray head 5 is controlled by an arithmetic device installed outside, but the arithmetic device can be downsized and housed in the spray head 5.

  According to the present invention, after measuring the mold temperature of the destination block and spraying the block with a discharge pattern corresponding to the measured mold temperature, the spray head 5 moves to the next block. Repeat the operation. For this reason, it becomes possible to spray the optimal amount according to the temperature to each site | part of the metal mold | die 1. FIG. In the present invention, since temperature measurement and spraying are performed almost simultaneously, an optimum amount of spraying can be performed on each part even at the time of starting up a die casting machine in which the mold temperature is changing.

  For this reason, according to the mold spray method and the mold spray system of the present invention, the mold temperature can always be maintained at the optimum temperature, and the defect occurrence rate of the molded product due to the fluctuation of the mold temperature is reduced. be able to.

1 Mold 2 Guide rod 3 Spray robot 4 Robot arm 5 Spray head 6 Spray nozzle 7 Non-contact thermometer

Claims (4)

A mold spraying method in which an inner surface of a mold is divided into a plurality of blocks in advance, and a release agent is sprayed while sequentially moving the spray head to each block,
Measure the mold temperature of the destination block with a non-contact thermometer mounted on the spray head, spray the block with a discharge pattern according to the measured mold temperature, and then move to the next block A mold spraying method characterized by repeating the operation.   2. The mold spray method according to claim 1, wherein the discharge pattern is obtained by changing an interval of pulse spray from the spray head in accordance with a mold temperature. A spray head equipped with a release agent spray nozzle and a non-contact thermometer;
A robot arm that sequentially moves the spray head to each block on the inner surface of the mold,
A mold spray system comprising: an arithmetic unit that controls a discharge pattern of a spray head according to a mold temperature of a destination block measured by a non-contact thermometer.   4. The mold spray system according to claim 3, wherein the spray head has a pulse spray function for intermittently discharging the release agent.