JPS60158940A - Die heater - Google Patents

Abstract

PURPOSE:To make temp. distribution of surfaces to be heated uniform and to improve heating efficiency by providing a heater body equipped internally with a combustion cylinder so as to face a single burner and interposing such body between upper and lower dies thereby delineating a combustion chamber. CONSTITUTION:A heater body 1 which is adhered with a heat insulating lining and is equipped internally with a combustion cylinder 7 so as to face a single burner 6 is interposed between upper and lower dies 15 and 16 to delineate a combustion chamber 17 by cooperation of the body 1 and the dies 15, 16 thereby constituting a heater 20. Then if a combustion gas is fed to the burner 6 and is ignited by an ignition device 5, a flame enters the inside of the cylinder 7 and is guided by a flow regulating plate 9 and a guide plate 11 so as to diffuse uniformly in the chamber 17 from the entire area of the cylinder 7. The waste gas after heating the surfaces to be heated of the dies 15, 16 is discharged from a discharge cylinder 12. The temp. distribution of the surfaces to be heated of the dies is thus made uniform and the heating efficiency is remarkably improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a mold heating device used for preheating casting molds, forging molds, and the like.

(Prior Art) Casting molds, forging molds, etc. are generally preheated prior to use.

Low-temperature preheating (approximately 250°C) is performed before coating the mold, and main preheating (approximately 400°C) is performed before casting.

Conventionally, to perform such preheating, a pipe burner equipped with many nozzles was used to heat the heated surface of the mold (
The flame was sprayed directly onto the carved surface.

However, when using the above-mentioned direct heating method, it is difficult to uniformly heat the complex-shaped surface to be heated, and uneven heating such as local heating or insufficient heating often occurs. Since heating is involved, there are problems in that heating efficiency is poor, preheating takes a long time, and energy loss is large. Furthermore, since the pipe burner is relatively large in size and roughly follows the shape of the heated surface of the mold, it is difficult to ignite it, resulting in unsafe work.

Furthermore, there was also the inherent problem that the working environment in the surrounding area deteriorated due to heat radiation to the surrounding area, noise generation, etc.

(Object of the Invention) The present invention has been made in view of the problems of the prior art described above, and achieves uniform temperature distribution on the heated surface and improved heating efficiency, and further improves ease of handling and safety. The purpose is to provide an improved mold heating device.

(Structure of the Invention) This object includes a main body that is interposed between upper and lower molds with heated surfaces facing each other, and that cooperates with the upper and lower molds to define a combustion chamber. A single burner is attached to one side of the main body, a combustion tube is installed inside the main body facing the single burner, and an exhaust means is attached to the main body, so that a flame is drawn into the combustion chamber. This is accomplished by a mold heating device that provides uniform diffusion.

(Example) An example of the present invention will be described below based on the accompanying drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a rectangular cylindrical main body, and the inner surface of the main body 1 is covered with a heat insulating lining 2 made of, for example, ceramic fiber. The main body 1 is also provided with support posts 3, 3, . A single burner 6 incorporating an automatic ignition device 5 is attached to the base 4, and combustion gas is supplied to the single burner 6 via a hose (not shown).

The flame ignited by the igniter 5 is injected into the main body 1.

Further, a combustion tube 7 is disposed within the main body 1 facing the single burner 6. The combustion tube 7 is.

It is made of a heat-resistant material such as stainless steel, and has an irregularly shaped outer shell 8 that is open at the top and bottom, a plurality of current plates 9a, 9b, and 9c arranged in pairs above and below within the outer shell 8, and a side wall of the outer shell 8. A plurality of holes 10a are drilled.

10b, 10e, and guide plates 11a, 11b located downstream of the holes 10a, tob, 10c and protruding from inside and outside the side wall of the outer shell 8. Due to this.

The flame injected into the main body 1 from the single burner 6 flows through the rectifying plates 9a, 9b+9c and the guide plates 11a, 1.
1b, the flow is appropriately rectified, and the liquid is uniformly injected vertically and laterally of the outer shell 8.

Furthermore, one main body 1 is provided with a plurality of exhaust pipes 12a and 12b. These exhaust pipes 12a and 12b.

Externally operable dampers 13 are provided at appropriate locations, and the displacement can be adjusted by operating the dampers 13.

Note that 14 is a support member for fixing the combustion tube 7 to the main body 1. In addition, the main body 1 is provided with an air supply hole (not shown), and is usually equipped with a flame detector to detect whether the combustion gas has reliably ignited. Mold 15 and lower mold 16
Its size is set according to the external dimensions of
When the upper mold 15 is placed on the main body 1 by using the upper mold 15, a combustion chamber 17 is defined inside thereof.

According to such a configuration, as shown in FIG.
When the main heating device 2o is interposed between the two burners 6 and combustion gas is fed to the single burner 6 and ignited by the ignition device 5, the flame first enters the combustion tube 7.

The combustion cylinder 7 is heated, and then the rectifier plates 9g and 9b are heated.

9c and the guide plates 11a and 11b, and uniformly diffuses into the combustion chamber 17 from the entire area of the combustion tube 7.

The heated surfaces 15' and 16' of the lower mold 15 and 16 are heated.

After that, it becomes waste gas and is discharged to the outside world from the exhaust pipes 12a and 12b. During this period, one ignition state is detected by the flame detector, and the damper 1 is detected to obtain a uniform flame state.
By the operation 3, the pressure inside the combustion chamber 17 is adjusted.

FIG. 4 shows the temperature rise characteristics of the mold using one heating device 2o in comparison with the results obtained using a conventional pipe burner. In Fig. 4.

The horizontal axis represents the elapsed time from the start of heating, and the R axis represents the surface temperature of the mold.In the case of using one heating device 20, as shown by curve A, one water temperature reaches 380°C. The average time it takes to reach the temperature is 1 hour (H), with a variation of about +40°C.

-4n℃, whereas in the case of the conventional one-type pipe burner, it takes an average of 1.6 hours to reach the preheating temperature of 580℃ for one pipe, as shown in curve @B.

The variation at that time is about +70°C and -80°C, which confirms that the single heating device 20 has high heating efficiency and excellent uniform heating properties. As shown in Figure 5,
It can also be used to keep the upper mold 15 and lower mold 16 set in the casting machine 30 warm. In this case, a support device 51 is separately attached to the casting machine 30, and this support For example, as shown in FIG.
Attach and place one heating device 20 on top.

It can be used for positioning and integration when interposed between the lower molds i5 and 15.

Further, in the above embodiment, one single burner 6 is provided, but the present invention is not limited to this, and two or more may be provided depending on the size of the mold.

(Effects of the Invention) As described above in detail, the mold heating device according to the present invention has a single burner attached to the main body on which two insulation insulation layers are provided, and a single burner facing the J4S-burner. By installing a combustion tube inside and inserting the main body between the lower molds, it cooperates with the molds to define a combustion chamber. It becomes possible to diffuse uniformly into the combustion chamber, thereby greatly contributing to uniformity of the degree distribution on the heated surface.

In addition, heating efficiency has improved and energy savings have been achieved, which is a significant effect.

In addition, the single heating device has a simple structure and is easy to handle, and is also easy to ignite and provides insulation to the outside.

It is highly safe due to the flame-stopping effect, and overall has a great effect on improving preheating work.

[Brief explanation of drawings]

Fig. 1 is a plan view showing the structure of the mold heating device according to the present invention, Fig. 2 is a similar side sectional view, Fig. 3 is a perspective view showing how the heating device is used, and Fig. 4 is a plan view showing the structure of the mold heating device according to the present invention. A correlation diagram showing the temperature rise characteristics of the mold by this heating device in comparison with the results obtained by a conventional pipe burner type. Figure 5 is a schematic diagram showing another usage mode of this heating device. It is a perspective view showing the main part structure of a mold heating device which is another embodiment of the invention.・・・Exhaust stack
13... Damper 15... Upper mold 16... Lower mold 15', 16'... Heated surface 17... Combustion chamber patent applicant Toyota Motor Corporation Co., Ltd. 1 Figure P 2 D'J O 3 Symbol 5 Changu (door 4 rΣgo elapsed time

Claims (2)

[Claims] (1) Interposed between the upper and lower molds with heated surfaces facing each other,
A combustion chamber is defined in cooperation with the upper and lower molds. A main body is provided with a heat insulating lining on the inner surface, a single burner is attached to one side of the main body, and a solenoid is installed inside the main body facing the single burner to carry a flame into the combustion chamber. 1. A mold heating device comprising: a combustion tube that diffuses the air; and an exhaust means attached to the main body. (2) The mold heating device according to claim 1, wherein the exhaust means comprises an exhaust pipe attached to one main body and a damper installed in the exhaust pipe.