JPH0799308B2 - Metal melting furnace - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is for producing general cast iron materials, aluminum, copper or alloys thereof, and manufacturing materials for parts such as transportation, electric, industrial machinery and equipment or materials for molds. Regarding melting furnace.

[0002]

2. Description of the Related Art Excessive temperature rise in a melting process using a metal melting furnace is not only metallurgically unfavorable,
It consumes a large amount of energy and is forced to raise costs. Nevertheless, in general, melting at high temperature is due to lack of sufficient sensor and control mechanism in conventional melting and casting techniques, and it depends on the experience and intuition of the operator. In many cases, the temperature is often raised excessively in order to secure a safety factor in manufacturing parts.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional circumstances, and is for producing metal and alloy raw materials while controlling the melting step by computer under optimum melting conditions, and Therefore, a melting furnace with extremely low energy loss was realized.

[0004]

In order to achieve the above object, the present invention provides a crucible mount made of a refractory having a crucible 17 installed therein.
Furnace frame 1 having a bottom 3 on which a placing part 3 is provided, and a lifting device for the furnace frame 1.
And a furnace body 2 provided via 6. This furnace body 2
Has a high-frequency melting / stirring coil 7 inside, has an inlet 8 for cooling water, a drainage port 9 and the like, and also surrounds the bottom dead center of the ascending / descending portion, that is, the crucible 17 installed on the crucible mounting portion 3. In this state, the heat insulating lid 10 that closes the crucible 17 is provided. Then, an optical fiber type radiation thermometer 11 and a platinum-rhodium type thermocouple 12 for non-contact measurement and control of the melting temperature in the crucible 17 penetrating the heat-retaining lid 10 were incorporated and provided outside. An acquisition device 13a of the computer 13,
It is a metal melting furnace configured to be connected to the temperature control device 13b and capable of automatic control constantly adapted to high humidity and low temperature.

Further, in the above structure, the heat insulating lid 10 is further added.
It is a metal melting furnace capable of creating an inert atmosphere by incorporating an inert gas injection device 18 such as argon gas or nitrogen gas penetrating therethrough.

[0006]

1 and 2, a furnace frame 1 is provided with a crucible mounting portion 3 consisting of a base 4 and a refractory castable 5 at the bottom , and a crucible 17 is placed thereon. Reference numeral 6 is a chain drive type lifting device 6 for moving the furnace body 2 up and down with respect to the crucible mounting portion 3, and M is its drive motor. This furnace body 2
Has a high-frequency melting / stirring coil 7 inside, and also has an inlet 8 for cooling water, a drainage port 9 and the like, and also has bent up and down its bottom dead center, that is, crucible 17 mounted on the crucible mounting part 3 is bent. In this state, the heat insulating lid 10 that closes the crucible 17 is provided. Then, an optical fiber type radiation thermometer 11 and a platinum-rhodium type thermocouple 12 for non-contact measurement and control of the melting temperature in the crucible 17 are incorporated through the moisturizing lid 10 and provided outside. The recording device 13a of the computer 13,
It is a metal melting furnace which is connected to the temperature control device 13b and is capable of always performing automatic control adapted to high temperature and low temperature.

[0007]

The metal melting furnace of the present invention is as described above. First, since the structure of the furnace is the no lining as described above, it is excellent in energy efficiency itself and the working efficiency is the same as the conventional lining. 5 times to 10 times compared to the method,
The furnace cooling time can also be shortened (heating and cooling of the furnace are changed from hours to minutes). In addition to using almost no expensive refractory materials in terms of manufacturing, it is free from the trouble of refractory lining and the dust environment, and saves labor such as furnace construction time, drying / firing time, and reduces costs.

Further, an optical fiber type radiation thermometer 11 and a platinum-rhodium type thermocouple 12 for non-contact measurement and control of the melting temperature in the crucible 17 penetrating the heat retaining lid 10 are incorporated, and these are connected to the outside. Since the acquisition device 13a and the temperature control device 13b of the computer 13 provided in
In the melting step, when the melting temperature in the crucible 17 is low, the platinum-rhodium type thermocouple 12 is used . On the other hand, when the melting temperature is high, the radiation thermometer (these are 1500 ° C. to 1650 °).
Non-contact measurement is performed by using C), and the measured value is input to a computer and fed back quickly and accurately by internal processing to control the inside of the furnace to the optimum conditions. And, by this, the dissolution energy is significantly reduced, which contributes greatly to so-called energy saving. According to the experiment result of the applicant, an energy saving effect of about 32% was obtained without deteriorating the material.

Further, the furnace body 2 is attached to the crucible mounting portion 3
Since it is moved up and down and the crucible 17 is left on the placing part 3,
No need for tilting movement like before to take out molten metal
However, the efficiency of the so-called "ladle process" can be improved and various
It is possible to support the melting method and melting temperature of.

Furthermore, in the case of incorporating an inert gas injecting device for argon gas, nitrogen gas, etc., when aluminum, copper or their alloys are melted, an inert atmosphere is created to reduce the gas content. As a result, a defect-free material can be manufactured.

From the above, the use of the metal melting furnace of the present invention is extremely advantageous in that the work efficiency is remarkably improved, the materials of various metals and their alloys are maintained, and the manufacturing cost is greatly reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of a metal melting furnace according to the present invention.

FIG. 2 is a schematic vertical sectional front view of the same.

[Description of marks Nos.]

1 Furnace Frame 2 Furnace Main Body 3 Crucible Placement 4 Base 5 Refractory Castable 6 Furnace Main Body Lifting Device M Drive Motor 7 High Frequency Melting / Stirring Coil 8 Cooling Water Inlet 9 Cooling Water Drain 10 Heat Keeping Lid 11 Fiber Optic Radiation Thermometer 12 Platinum-rhodium type thermocouple 13 Computer 13a Acquisition device 13b Temperature control device 15 Optical fiber and measurement cable 16 Measurement cable 17 Crucible 18 Inert gas injection device 19 Gas cylinder

Claims (2)

[Claims] 1. A crucible made of a refractory having a crucible (17) installed.
Furnace frame (1) provided with crucible mounting part (3) at the bottom, and the furnace frame
A furnace body (2) provided in (1) through an elevating device (6);
The furnace body (2) is provided with a high frequency melting / stirring coil (7) and also has a cooling water inlet (8), a drainage port (9), etc. The crucible (17) placed on the placing part (3) is provided with a heat insulating lid (10) for closing the crucible (17) in a state of being bent, and the heat insulating lid (10) is further penetrated to the inside of the crucible (17). Fiber-optic radiation thermometer (11) and platinum-rhodium type thermocouple (1 ) for non-contact measurement and control of melting temperature of
2) is incorporated and is connected to an external recording device (13a) and temperature control device (13b) of a computer (13) to enable automatic control constantly adapted to high temperature and low temperature. Metal melting furnace. 2. The metal melting furnace according to claim 1, wherein an inert gas injection device (18) for argon gas, nitrogen gas or the like is incorporated through the heat retaining lid (10).