JP2018031543A - Method of manufacturing burner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a burner such that when a constituent member of the burner has a projection part formed by press processing, the projection part is prevented from being improperly made thin to be properly formed.SOLUTION: The present invention relates to a method of manufacturing a burner that includes a press process of manufacturing a burner constituent member comprising at least one projection part 6 by subjecting a metal plate 7 to press processing, which comprises a drawing process of forming a prototype projection part 6a as a prototype of the projection part 6, and a molding process of shaping the prototype projection part 6A into the projection part 6 having a final finish target shape and size, the drawing process including forming the prototype projection part 6A which is larger in height and projection area than the projection part 6 having been shaped.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a method for manufacturing a burner used for, for example, a combustion device of a hot water supply device.

The present applicant has previously proposed, for example, the one described in Patent Document 1 as a specific example of the burner.
The burner described in this document is a lean burner, and is a gas burner in which a plurality of rich flame holes and pale flame holes are provided on the upper surface portion in order to reduce NOx. This burner has a structure in which a plate member called a flame hole forming portion and an intermediate plate that supports the flame hole forming portion is accommodated in a flat burner main body plate having an open upper surface. The aforementioned constituent members of the burner are formed by pressing a metal plate.

  On the other hand, as a constituent member of the burner, there is a member provided with a convex portion bulging, for example, in a hemisphere. Conventionally, as means for forming such a convex portion, there is a means for applying a press process to a metal plate a plurality of times and finishing the convex portion in a stepwise manner. Specifically, in this means, a convex part having a size smaller than the convex part of the final finishing target is formed by the first press work, and the size of the convex part is increased in the second and subsequent press work. In this way, a convex portion having a desired shape and size is finally formed.

  However, according to the prior art, there is room for improvement as described below.

  That is, when forming the above-mentioned convex part, it is usual that the press work is simultaneously performed also to the other location of the metal plate. For this reason, there is a risk of causing a phenomenon (thinning) that the thickness of the convex portion is pulled to the other location side and the thickness of the convex portion is reduced due to the press processing of the other location. is there. In recent years, the number of flame holes in the burner tends to increase considerably, and the thickness of the burner is increasing. For this reason, the diaphragm | throttle at the time of the press work to a metal plate is also deep, and the above-mentioned thinning tends to arise more. In addition, when a plurality of press processes are repeated, if there is a center shift in the press punch in the second and subsequent press processes, the punch is biased to abut on the convex part, and this also causes the convex part to The wall thickness becomes thin. For this reason, conventionally, the thickness of the convex portion is considerably thinner than the originally intended dimension, and there is a risk of necking or cracking of the convex portion. As a means for suppressing this, it is conceivable to increase the thickness of the metal plate. However, adopting such a means is preferable because it leads to an increase in manufacturing cost and an increase in the size and weight of the burner. It is not a thing.

Japanese Patent No. 5673965

  The present invention has been conceived under the circumstances as described above, and when a convex portion is formed on a component of a burner by pressing, the convex portion is unduly thinned. An object of the present invention is to provide a method of manufacturing a burner that can prevent and appropriately form the convex portion.

  In order to solve the above problems, the present invention takes the following technical means.

  The method for manufacturing a burner provided by the present invention is a method for manufacturing a burner, comprising a pressing step of pressing a metal plate and manufacturing a burner constituent member having at least one convex portion, In the pressing step, a drawing step for forming a prototype convex portion as a prototype of the convex portion, and a molding step for molding the prototype convex portion into a convex portion having a final finish target shape and size, In the drawing step, the original convex portion is formed in a shape having a height higher than that of the convex portion after molding and a large projected area.

According to such a configuration, the following effects can be obtained.
That is, the original convex part formed by the drawing process has a larger volume compared to the convex part after molding, and the convex part forming process after molding is performed by changing the original convex part having a large volume. It forms as a convex part with a smaller volume. Therefore, when forming the convex part after molding, the fact that the meat becomes deficient or dull is solved, and even if the meat is pulled by pressing other parts of the metal plate, the thickness of the convex part Can be avoided. Further, even if there is some punch misalignment during the molding process, it is possible to obtain an effect that it is difficult to significantly reduce the thickness of a part of the convex part after molding due to this. For this reason, it is possible to sufficiently secure the thickness of the convex portion after molding, unlike the conventional technique in which press working is repeated so as to gradually increase the size of the convex portion. As a result, the strength of the convex part after molding can be increased and necking or cracking can be prevented.

  In the present invention, preferably, the molded convex part and the original convex part are both substantially hemispherical bulging shapes.

  The substantially hemispherical bulge-shaped convex portion is likely to cause thinning, and when the thickness is reduced, cracks and the like are also likely to occur. Therefore, the present invention is particularly suitable for forming such a convex portion.

  In the present invention, it is preferable that the drawing step and the forming step are performed such that a thick portion where the surface of the metal plate around the convex portion after the forming rises more than the peripheral portion surface appears.

According to such a configuration, the following effects can be obtained.
That is, the thick-walled portion is a portion resulting from a surplus in the meat due to the formation of a convex portion having a smaller size at the location where the original convex portion is formed. Appearance of such a thick part means that the convex part after molding is sufficiently thick, and it is more preferable for preventing the thickness of the convex part after molding from being insufficient. Become. Further, as an important effect, even if the thickness of the region of the convex portion after forming is subjected to a tension by being pressed in another part of the metal plate, the tension is made to correspond to the thick portion. be able to. Therefore, it is possible to obtain an effect of making it difficult to reduce the thickness of the convex portion after molding.

  In the present invention, it is preferable that the drawing step and the forming step are performed such that the outline of the thick portion is substantially the same as the outline of the original convex portion.

  According to such a configuration, the volume of the thick part is sufficiently increased, and it is more appropriately prevented that the convex part after molding is thinned due to the press processing in other places. .

  Other features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention with reference to the accompanying drawings.

It is a perspective view which shows an example of the burner of the manufacturing object of the method which concerns on this invention. FIG. 2 is an exploded perspective view of FIG. 1. It is a principal part top view which shows an example of the manufacturing process of the burner shown in FIG. 1 and FIG. (A), (b) is principal part sectional drawing which shows the press work of the convex part in the manufacturing process shown in FIG.

  Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.

  First, FIG. 1 and FIG. 2 show an example of a burner to be manufactured by the manufacturing method of the present embodiment. The burner B shown in FIGS. 1 and 2 is the same as that described in Patent Document 1, and is a so-called light and dark combustion burner. The basic configuration of this burner B is known in the art and will be described briefly. That is, the burner B includes a burner body plate 1, an intermediate plate 2, a flame hole forming portion 3, and a pair of outer plates 4. The burner body plate 1 includes a pair of side wall portions 10 that are integrally connected at the lower end portion, and the pair of side wall portions 10 are formed into a flat case shape having an upper surface opening shape as a whole. On one side of the burner body plate 1, supply ports 11a and 11b for mixed gas of fuel gas and combustion air are formed. The flame hole forming portion 3 is a member that forms a plurality of flame holes 5 as a deep flame hole and a light flame hole, and is housed in the burner body plate 1 together with the intermediate plate 2. The pair of outer plates 4 are joined to upper portions of both side surfaces of the burner body plate 1, and also form flame holes 5 (rich flame holes) between the burner body plates 1.

  In the burner B, a plurality of (four in the drawing) convex portions 6 projecting inward are formed at positions near the upper portions of the pair of side wall portions 10 of the burner body plate 1 (see FIG. 2). . The convex portion 6 serves as an engaging portion or a stopper for preventing the intermediate plate 2 and the flame hole forming portion 3 from coming off on the burner body plate 1. The method for manufacturing a burner according to the present embodiment is characterized in the process of forming the convex portion 6 described above.

FIG. 3 shows a process of manufacturing the burner body plate 1 and the pair of outer plates 4 shown in FIG. 2 by pressing the metal plate 7.
The metal plate 7 is, for example, a thin stainless steel plate, which is simplified in the drawing, but is connected in series in the left-right direction. The press forming of the burner main body plate 1 and the outer plate 4 uses a so-called progressive method. It is done using. Moreover, the burner main body plate 1 and the outer plate 4 are formed in an integrally connected state, and are divided later.

  Of the press working stage for the metal plate 7, in the first region A1, the prototype part 1B of the burner body plate 1 and the prototype part 4B of the pair of outer plates 4 are press-molded. In the second region A2, intermediate forming portions 1A, 4A obtained by further pressing the above-described original portions 1B, 4B are formed. In the third region A3, the burner body plate 1 and the pair of outer plates 4 are pressed. Processing is complete.

  In 2nd area | region A2, the prototype convex part 6A used as the prototype of the above-mentioned convex part 6 is formed. The formation of the original projection 6A is performed as shown in FIG. Specifically, the process shown in the figure is a drawing process of the metal plate 7 using the punch 9A and a die (not shown) corresponding to the punch 9A, and the height of the original projection 6A formed by this drawing process. Ha is higher than the height H of the convex part 6 (the convex part 6 after molding) shown in the figure (b) to be finally formed, and the projected area Sa of the original convex part 6A is the convex part after molding. It is larger than the projected area S of the part 6. Each of the original convex portion 6A and the molded convex portion 6 has a substantially hemispherical bulging shape.

In the third region A3 of FIG. 3, a molding process is performed on the original convex portion 6A shown in FIG. As shown in FIG. 4B, this forming step is a step of forming the original convex portion 6A into the convex portion 6 having the final finish target shape and size. The drawing process and the molding process described above are preferably performed such that the thick part 60 appears around the convex part 6 after molding. The thick portion 60 is a portion whose surface is raised more than the peripheral surface. More preferably, the drawing step and the molding step described above are performed such that the diameter D (corresponding to the contour size in the present invention) of the thick portion 60 is substantially the same as the diameter Da of the original convex portion 6A. It is. Unlike the punch 9 for the forming process, the punch 9A used in the drawing process can adjust the lifting stroke, and the thick portion 60 can be made to appear by adjusting the drawing amount. .

  According to the series of steps described above, since the convex portion 6 having a smaller volume than the original convex portion 6A having a large volume is formed, it is possible to prevent the thickness of the convex portion 6 from being insufficient. is there. The thick portion 60 appears due to the fact that the thickness of the original convex portion 6A exceeds the amount of meat necessary for forming the convex portion 6, so that the thick portion 60 appears. In this case, the thickness of the convex portion 6 is not deficient.

  In the second region A2 and the third region A3 shown in FIG. 3, since various pressing processes are performed on other portions of the metal plate 7, the original projection 6 </ b> A and In some cases, the flesh of the portion where the convex portion 6 is formed is subject to pulling. However, according to the work process of the present embodiment, the original convex portion 6A and the convex portion 6 are significantly reduced due to such a situation. It is possible to make meat difficult to produce. In addition, even after the convex portion 6 is formed, even if the meat is pulled from other places, the thickness of the thick-walled portion 60 corresponds to such a pull, and the thinning of the convex portion 6 is preferably prevented. Or suppressed. For this reason, according to the present embodiment, the thickness of the convex portion 6 can be sufficiently secured, the strength thereof can be increased, and necking and cracking can be made difficult to occur.

  The present invention is not limited to the contents of the above-described embodiment. The specific configuration of each step of the burner manufacturing method according to the present invention can be variously changed within the intended scope of the present invention.

In general, the burner component is provided with a plurality of convex portions, but it is not necessary that all of the plurality of convex portions be formed through the drawing step and the molding step intended by the present invention. If at least one of the plurality of convex portions is formed through the drawing step and the molding step intended by the present invention, this manufacturing method is included in the technical scope of the present invention.
The convex part shape | molded by press work should just be comprised in a burner structural member, The specific shape, size, number, formation position, the kind of burner structural member currently formed, etc. are not limited. The means of the present invention can also be applied to the formation of a convex portion having a shape different from the substantially hemispherical shape.
The specific configuration and application of the burner to be manufactured are not limited.

B Burner 6 Convex (Convex after forming)
6A Prototype convex part 60 Thick part 7 Metal plate

Claims (4)

A method for producing a burner, comprising pressing a metal plate and producing a burner constituent member having at least one protrusion.
In the pressing step, a drawing step for forming a prototype convex portion as a prototype of the convex portion, and a molding step for molding the prototype convex portion into a convex portion having a final finish target shape and size,
In the drawing step, the original convex portion is formed to have a height higher than that of the convex portion after molding and a projected area is large. It is a manufacturing method of the burner according to claim 1,
The method of manufacturing a burner, wherein the convex part after molding and the original convex part are both substantially hemispherical bulging shapes. A method for producing a burner according to claim 1 or 2,
The method for producing a burner, wherein the drawing step and the forming step are performed such that a thick portion where the surface of the metal plate around the convex portion after the forming rises more than the surface of the peripheral portion appears. A method for producing a burner according to claim 3,
The method of manufacturing a burner, wherein the drawing step and the forming step are performed such that the outline of the thick portion is substantially the same as the outline of the original convex portion.

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