JP2007308741A - Locally heating device for stepped material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a locally heating device for heating only a larger diameter portion of a stepped material (1) having both of the larger diameter portion (12) and a smaller diameter portion (11), which can treat a large number of the materials at the same time, rapidly and uniformly heat the materials, has an excellent operability, and shows high thermal efficiency. <P>SOLUTION: A furnace body which is lined with a refractory comprises: a furnace wall (2) having a long elliptic cross section; a horizontal hearth (3); a plurality of anvils (4) which are arranged into a staggered configuration; and a ceiling (5) provided with a plurality of charging/discharging holes (25) for the stepped material, which are formed at positions corresponding to the anvils. The locally heating device comprises: the furnace body; a slide lid (6) which has notches (61) with a size matching to the smaller diameter portion of the stepped material, on the ceiling; a slide means (7) for the lid; and burners (8) which are installed on both sides of the furnace body so as to face each other. A flame blowing out from the burner and a combustion gas convolutely flow in the furnace. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention is a “stepped material” of metal, particularly steel, that is, a large diameter portion and a small diameter portion exist in one material, but only the large diameter portion is subjected to heat treatment or hot working. It relates to a device for local heating.

For example, in manufacturing a valve for a large engine, first, a large-diameter rod-shaped material is cut into an appropriate length, and one end is forged, whereby a small-diameter and long portion (example shown in FIG. 1) ( A stepped material (1) is prepared in which 11) and a short portion (12) with a large diameter are connected via a tapered portion (13). The small diameter and long part becomes the stem of the valve, and the large diameter and short part is formed by hot stamping forging to form a cap. Such a stepped material needs to locally heat only a large diameter portion for forging.

Local heating of the stepped material requires that the part to be heated be quickly and uniformly at the desired temperature, that many stepped materials can be processed simultaneously, and that the heat efficiency is good. The The conventional heating apparatus does not satisfy these requirements at the same time.

An object of the present invention is to provide an apparatus for locally heating a stepped material, which satisfies the above-described requirements all at once. Specifically, a large number of stepped materials can be processed at the same time, the temperature of the stepped material to be heated is rapid, the heated portion has a uniform temperature, and a heating furnace This is a heating device that satisfies the requirements of good operability, easy control, and high thermal efficiency.

The apparatus for locally heating the stepped material of the present invention is a single metal material as shown in FIG. 1, and has a large diameter portion (12) and a small diameter portion (11). An apparatus for locally heating only a large-diameter portion of a stepped material (1) for heat treatment or hot working, and a furnace wall (2) having an oblong cross section with a long interior, substantially horizontal A large hearth (3), a plurality of platforms (4) arranged on the hearth, and a loading / unloading hole (25) having a diameter through which a large-diameter portion of the stepped material can pass. ) Is a furnace body lined with a refractory, comprising a plurality of ceilings (5), and has a notch (61) on the ceiling and sized to match the small diameter portion of the stepped material An essential component by adding a lid (6), its sliding means (7), and a burner (8) provided opposite to both ends of the furnace body; , The axis of the flame discharged from the burner deviate from each other, the combustion gas is local heating apparatus constructed the stepped member to flow spirally in the furnace.

The stepped material local heating device of the present invention can process any number of stepped materials to a significant extent by selecting the capacity of the furnace body. Since the burner is provided opposite to both ends of the furnace body, the temperature of the stepped material to be heated rises rapidly as a result of the flame flowing in a spiral in the furnace, and the heated portion of each stepped material Also, the temperature becomes uniform between the stepped materials. The temperature can be precisely controlled. For example, when the heating target temperature is 1050 ° C., it is easy to realize a temperature range of about ± 15 ° C.

The object to be adjusted in the operation of the furnace is only the matters related to the operation of the burner, that is, the supply rate of fuel and air and the ratio of both, and it is easy to control automatically, so the operability as a heating furnace is good It is. Since this heating apparatus has a structure in which the flame flows in a spiral in the furnace and heats the stepped material as described above, high thermal efficiency can be obtained.

The use of this heating device begins with placing the stepped material (1) to be heated on a table (4) in the furnace. This work involves grasping the small diameter part (11) of the stepped material with an appropriate manipulator and putting it in an upright state through the loading / unloading hole (25) provided in the furnace ceiling and placing it on the stand. It is done by putting. At this time, as shown in FIG. 5A, the slide lid (6) is retracted so that the loading / unloading hole is completely opened so that the large diameter portion (12) of the stepped material can pass therethrough. .

When the stepped material has been placed on the table, the slide lid (6) is advanced as shown in FIG. 5B, and a semicircular cutout with a diameter matching the small diameter portion (11) of the stepped material ( 61) is in contact with the small-diameter portion and covers most of the loading / unloading hole (25). Part of the hole remains open and becomes a flue (9) through which the combustion gas passes.

If the burners provided at both ends of the furnace are ignited as described above, the flame is heated, that is, a large diameter portion (12 ) In the outer side of the large-diameter portion, while flowing between the stepped materials, rising and exiting the furnace through the flue (9). Heat everything except the part. The inner parts arranged side by side are heated by the combustion gas that has entered between the stepped material. In this way, as a result of uniform heating over the entire circumference of the stepped material, partial temperature unevenness does not occur, and all the stepped materials have a uniform temperature.

When the desired heating is achieved, the slide lid (6) is retracted to open the loading / unloading hole (25), and the small diameter portion (11) of the stepped material is again grasped and placed above the furnace. Draw and turn to the next step, stamping forging, etc. Therefore, it is preferable that the slide lid is divided and provided with slide means so that it can be advanced and retracted every small number of stepped materials (three in the illustrated example). .

When a large number of stepped materials are sequentially taken out and charged, a new stepped material is loaded as described above after the removal. When heating is completed in one batch, after removing the stepped material, for example, the slide lid is further advanced to close the charging / unloading hole (25), thereby preventing the combustion gas from flowing out from the open hole. It is desirable.

In the illustrated example, the stage on which the stepped material is placed is arranged in a staggered arrangement on the hearth, and the ceiling loading / unloading holes are also arranged in a staggered arrangement. This structure is suitable for moving the slide lid forward and backward from one direction to open and close the loading / unloading holes described above, but it is of course possible to use a grid arrangement instead of a staggered pattern. . In that case, it is necessary to provide a structure in which slide lids are provided on both sides to advance and retreat in opposition.

The side view which shows an example of the stepped material which performs local heating using the heating apparatus of this invention. The top view which shows an example of the local heating apparatus of the stepped material of this invention, and showed one part inside except a cover and a ceiling. FIG. 3 is a longitudinal sectional view of the heating device in FIG. The II-II direction cross-sectional view of the heating apparatus of FIG. It is a figure explaining the effect | action of the slide cover of the heating apparatus of FIG. 2, Comprising: A shows the state which the slide cover retracted, B shows the state which advanced.

Explanation of symbols

1 Stepped material
DESCRIPTION OF SYMBOLS 11 Small diameter part 12 Large diameter part 13 Tapered part 2 Furnace wall 25 Insertion / extraction hole 3 Hearth 4 Unit 5 Ceiling 6 Slide lid 61 Notch 7 Slide means 8 Burner 9 Chimney

Claims (2)

It is a device for locally heating only a large diameter part of a “stepped material”, which is a single metal material and has a large diameter part and a small diameter part, for heat treatment or hot working. In addition, a furnace wall having a long oval cross section inside, a substantially horizontal hearth, a plurality of stands arranged on the hearth, and a large-diameter portion of stepped material arranged corresponding to the positions of the passes A refractory-lined furnace body consisting of a ceiling with multiple possible loading and unloading holes on the ceiling, with a notch that fits the small diameter portion of the stepped material A step heating material local heating device comprising essentially a slide lid, a slide means thereof, and burners provided at both ends, respectively. The stage according to claim 1, wherein the plurality of platforms are arranged in a staggered arrangement, and the loading / unloading holes are provided in a staggered arrangement, and the sliding means is installed so that the slide lid moves forward and backward from one direction. Local heating device for attached materials.

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