JPH01215452A - Device for controlling die temperature - Google Patents

Abstract

PURPOSE:To shorten a working time and to improve the accuracy in detecting a temp. by detecting the temp. of the bottom face of the bottomed hole reaching up to the cavity vicinity of a die pierced on the outer face of the die by the camera for detecting a radiation temp. CONSTITUTION:A cavity 9 is formed by fixed die 5 and moving die 6. The water amt. relying on the opening and closing operation of motor valves M1, M2 by passing through flow path 10, 20 is fed to cooling chambers 10A, 20A respectively. Bottomed holes 1, 2 are pierced so as to have an opening at the position surrounded by the cooling chambers 10A, 20A, a heat insulating material 8 is peripherally provided on the outer peripheral face of a pipe 7 and these are buried in the hole 1, 2. The camera 11 for detecting radiation temp. is then arranged at the position having the visual field angle theta including the holes 1, 2 in the visual field by opposing to a face 5A, measuring the temp. of the bottom face of the hole 1 at the vicinity of the cavity 9 by the camera 11 by detecting the heat ray reflected until the hole 1 opening part. The observed value and reference value are compared by a camera control device 15 and the valve 1 is opened and closed to control the die temp.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a temperature control device for a casting mold.

[Prior Art] In the casting manufacturing process, the temperature of the cavity of the casting mold is controlled to the optimum temperature in order to improve the quality of the cast product, shorten the casting cycle, and extend the life of the casting mold. Conventionally, a thermocouple attached near the cavity has been used as a means for detecting the temperature of the cavity.

In the case of die casting, which allows casting of complex shapes, the molten aluminum alloy is not distributed with a uniform wall thickness, resulting in uneven temperature distribution within the casting mold cavity. If the entire surface of the casting mold cavity is not constantly controlled to maintain the optimal casting temperature between 400°C and 500°C, cracks and cavities will occur, resulting in the finished cast product being defective. cormorant.

Therefore, in order to maintain the optimum casting temperature throughout the cavity, the mold temperature detection points may vary depending on the mold shape.
The number of thermocouples used is equivalent to the number of detection sites, although there may be more than ten locations.

Then, the supply of the cooling medium to the mold is controlled based on the actual measured values detected by these thermocouples.

[Problems to be Solved by the Invention] However, when using a contact temperature detection method that detects temperature by contact, for example, using a thermocouple, it is necessary to change the casting mold to the casting machine at the time of stage change. Not only is the wiring of the thermocouple complicated when installing the thermocouple, but when the thermocouple is attached near the cavity of the mold, there is a risk of foreign matter intervening between the temperature detection part of the mold and the thermocouple. It has been pointed out that the problem is that the bite becomes stubborn, making accurate temperature detection impossible.

Therefore, it is an object of the present invention to provide a mold temperature detection device that can reduce work time by eliminating the need for thermocouple wiring when changing casting molds, and can also accurately detect temperature. That purpose.

[Means for Solving the Problems] In order to achieve the above object, in the mold temperature detection device of the present invention, a plurality of bottomed holes having bottoms reaching the vicinity of the cavity are bored in the outer surface of the casting mold. A radiation temperature detection camera is arranged at a position facing the outer surface part, and the temperature of the bottom surface of the bottom hole detected by the radiation temperature detection camera is compared with the reference value. The supply of cooling medium to the casting mold is controlled.

[Function] In the mold temperature detection device configured as described above, when the casting mold is raised to near the optimum casting temperature and casting is started, the The temperature in the vicinity of the cavity, which is transmitted to the opening of the bottom hole, is actually measured using a radiation temperature detection camera to obtain the actual value, and this actual value is compared in size with the reference value. It serves to control the supply of cooling medium to the mold.

[Example] An example will be described with reference to the drawings. Fig. 1 is an overall configuration diagram of an embodiment of the mold temperature control device according to the present invention. In Fig. 1, the casting mold is a movable mold. It is composed of a mold 6 and a fixed mold 5, and a cavity 9 is formed in the mating surfaces of the mold 6 and the fixed mold 5. This cavity 9 is provided with a sprue, a core, an extrusion pin, etc. (not shown), and functions as a casting mold.

In addition, the flow paths 10 and 20 are configured by branching the supply of cooling medium, that is, water at a predetermined water pressure, into two water channels, and electric valves Ml and M2 are provided at the entrances of the respective water channels. Water supply to the flow paths 10 and 20 can be controlled independently.

In the vicinity of the cavity 9 of the fixed mold 5, the water supplied through these channels 10 and 20 temporarily remains, forming a cooling chamber 1 that functions to cool the cavity 9.
0A and 20A are provided, and the amount of water is supplied to these cooling chambers 10A and 20A depending on the opening and closing operations of electric valves M1 and M2, which are controlled as described later.

On the other hand, a bottomed hole 1.2 is bored in a position surrounded by these cooling chambers 10A and 20A so as to have an opening in the fixed mold surface 5A.

The radiation temperature detection camera 11 is located in the bottomed hole 1 of the fixed mold surface 5A.
．． It has a field of view angle indicated by θ in the figure, which includes 2 in its field of view, and is placed at a position where it focuses on the surface of the fixed mold surface 5A, and the cavity 9 is transmitted as described below. It is possible to detect the temperature in the vicinity of the temperature.

The radiation temperature detection camera 11 is connected to a camera control device 15, and the detected temperature information is sent to the camera control device 15. may be connected to enable monitoring of the temperature distribution of the cavity 9, which will be described later.

On the other hand, the camera control device 15 and the mold temperature control section 17 are connected by a camera cable 15A. Valued temperature information is transmitted through this camera cable 15A. This mold temperature control section 17 and electric valves M1 and M2 are connected by cables 17A and 17B, respectively, and operation signals for opening and closing the electric valves M1 and M2 are transmitted via these cables 1F A and 17B. It has become so.

Next, in FIG. 2, which is a partial sectional view showing a part of the bottomed hole 1 in FIG. 1, the bottomed hole 1 is constructed as follows. A hole having an inner diameter sufficient to bury the surrounding heat insulating material 8 and a depth sufficient to provide the bottom surface IA located near the portion 9A of the cavity 9 is formed at a position surrounded by the cooling chamber 10A. It is done in advance. After the holes are formed in this way, the vibrator 7 and a heat insulating material 8 which is disposed around the outer peripheral surface of the vibrator 7 to prevent heat transfer to the vibrator 7 are buried.

Here, the inner surface of this vibrator 7 is given a mirror finish by plating or polishing, and the bottom surface through which the temperature of the portion 9A of the cavity 9 is transferred! The temperature on A is reflected or goes straight and is taken out to the outside as a hot wire, as shown by broken lines x1 and x2 in the figure. The heat rays taken out in this way are
1, and the camera control device 15 detects 2.
It is converted into valued temperature information.

FIG. 3 is a view along line ss' in FIG. 1, showing the surface of the fixed mold surface 5A on which the radiation temperature detection camera 11 described above focuses.

A bottomed hole 1 is provided in the upper part of the cavity 9 shown by the broken line in FIG. 3, and a bottomed hole 2 is provided in the lower part.

Next, FIG. 4 is a flowchart of control according to the overall configuration diagram of FIG. It is designed to act and execute.

Explaining based on FIG. 4 and FIG. 1, when the casting mold is raised to a temperature close to the optimum casting temperature and casting is started, the program starts, and in step S1 the above-mentioned radiation temperature detection camera 11 The heat rays reflected to the opening of the bottomed hole 1 are detected, and it is determined whether the actual temperature value T, which is binarized in the camera control device 15, is larger than the reference value TA. , if a YES judgment is made that it is large,
Proceeding to step S2, a command is issued to open the electric valve M1.

On the other hand, if a No determination is made in step S1 that the actual measured value T is smaller than the reference value TA, the process proceeds to step S3 and a command is issued to close the electric valve M1.Next, in step S4, the bottomed hole A determination is made as to whether or not the actual measured value T2 of the temperature No. 2 is greater than the reference value T^, and YE≧ is greater.
Once the determination is made, the process proceeds to step S5, where a command is issued to open the electric valve M2. Then, the process returns to step S1 and the program is re-executed.

On the other hand, if a No determination is made in step S4 that the measured value T2 is smaller than the reference value TA, the process proceeds to step S6 and a command is issued to close the electric valve M2. Then, the process returns to step S1 and the program is re-executed. Thereafter, this program flow continues until the operation of the mold temperature detection device is completed.

As explained above, by controlling the amount of water depending on the opening/closing operations of the electric valves M1 and Ml, the cavity 9 is maintained at the optimum casting temperature.

In order to simplify the explanation, only the case where there are two bottomed holes has been described, but it goes without saying that a large number of these bottomed holes may be provided.

Moreover, the above-mentioned mold temperature detection device is applicable to various casting methods without being limited to die casting.

[Effects of the Invention] Since the present invention is configured as described above, it is possible to shorten the working time when changing casting molds, and to detect mold temperature that allows accurate temperature detection. equipment can be provided.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of an embodiment of the mold temperature control device according to the present invention, FIG. 2 is a partial sectional view showing the bottomed hole 1 in FIG. 1, and FIG. 3 is the same as in FIG. 1. FIG. 4 is a flowchart of control according to the overall configuration diagram of FIG. 1. In the figure, 1.2...Bottomed hole, 5...Fixed mold, 6...
・Movable mold, 7...pipe, 8...insulation material, 9...
- Cavity, 10.20... Channel, 11... Radiation temperature detection camera, 15... Camera control device, 17.
... Mold temperature control section, Ml, Ml... Electric valve, fixed mold surface 5A. Figure 2 Figure 3

Claims (1)

[Claims] A plurality of bottomed holes having bottoms reaching near the cavity are bored in the outer surface of the casting mold, and a radiation temperature detection camera is disposed at a position facing the outer surface, and the radiation temperature detection camera detects the temperature detected by the radiation temperature detection camera. A mold temperature control device, characterized in that the cooling medium supply to the casting mold is controlled by comparing the measured value of the temperature of the bottom surface of the bottomed hole with a reference value.