JP4290017B2 - Manufacturing method of lead damper - Google Patents

Manufacturing method of lead damper Download PDF

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JP4290017B2
JP4290017B2 JP2004004145A JP2004004145A JP4290017B2 JP 4290017 B2 JP4290017 B2 JP 4290017B2 JP 2004004145 A JP2004004145 A JP 2004004145A JP 2004004145 A JP2004004145 A JP 2004004145A JP 4290017 B2 JP4290017 B2 JP 4290017B2
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lead
flange
manufacturing
welding
damper
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JP2005193282A (en
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功二 廣島
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OSAKA KAKO CO., LTD.
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Description

本発明は、鉛からなる鉛部と、鉛部の上面および下面のそれぞれに設けられたフランジ部とを備えた鉛ダンパーの製造方法に係り、特に鉛部とフランジ部とを溶着するための溶着技術を改良した鉛ダンパーの製造方法に関する。     The present invention relates to a lead damper manufacturing method including a lead portion made of lead and a flange portion provided on each of an upper surface and a lower surface of the lead portion, and in particular, welding for welding the lead portion and the flange portion. The present invention relates to a method of manufacturing a lead damper with improved technology.

鉛を利用した鉛ダンパーは、免震構造用などのダンパーとして各種製品化・実用化されている。鉛ダンパーは、鉛からなる鉛部を備え、鉛部の上面および下面には、鋼材からなるフランジ部が設けられている。このような鉛ダンパーは、それぞれのフランジ部が上部構造物および下部構造物に取り付けられることにより、これら構造物の間に設置され、その間に生じた振動エネルギーを吸収する。   Lead dampers using lead have been commercialized and put to practical use as dampers for seismic isolation structures. The lead damper includes a lead portion made of lead, and a flange portion made of a steel material is provided on an upper surface and a lower surface of the lead portion. Such a lead damper is installed between these structures by the respective flange portions being attached to the upper structure and the lower structure, and absorbs vibration energy generated therebetween.

このような鉛ダンパーとしては、特許文献１に開示されているように、鉛部の上面および下面のそれぞれの縁部にフランジ部を設けた構成のものがあるが、鉛ダンパーの強度を向上させるために、鉛部の上面および下面のそれぞれの全面にフランジ部を設けた構成のものがよく利用されている。
特許２７２６６５５号公報（第３項、図１） As such a lead damper, as disclosed in Patent Document 1, there is a structure in which a flange portion is provided at each edge of the upper surface and the lower surface of the lead portion, but the strength of the lead damper is improved. Therefore, a structure in which a flange portion is provided on the entire upper surface and lower surface of the lead portion is often used.
Japanese Patent No. 2726655 (section 3, FIG. 1)

このような鉛ダンパーにおいて、鉛部とフランジ部との接合は、いわゆるホモゲン溶着法により行われている。すなわち、図４に示すように、はんだ層１１３が形成されたフランジ部１１２の上面に鉛部１１１を載置し、フランジ部１１２の下面から加熱処理を施すことにより、鉛部１１１の下面およびはんだ層１１３を溶かして、いわゆるホモゲン状態にする。そして、加熱処理を終了し、冷却して凝固することにより、鉛部１１１にフランジ部１１２を溶着する。   In such a lead damper, the lead portion and the flange portion are joined by a so-called homogen welding method. That is, as shown in FIG. 4, the lead portion 111 is placed on the upper surface of the flange portion 112 on which the solder layer 113 is formed, and heat treatment is performed from the lower surface of the flange portion 112, whereby the lower surface of the lead portion 111 and the solder are formed. The layer 113 is melted to a so-called homogen state. Then, the flange portion 112 is welded to the lead portion 111 by finishing the heat treatment, cooling and solidifying.

ところで、鉛部１１１とフランジ部１１２との溶着強度は極めて高いことが要求され、そのため、両者を全面で溶着する必要がある。しかしながら、溶着強度を機械的な試験で測定しようとしても、鉛部１１１が先に降伏してしまうため、測定は不可能である。このため、溶着を目視で確認する必要があった。しかしながら、上記のような溶着技術では、溶着面が水平方向に拡がっているため、溶着を目視で確認することができなかった。また、鉛の酸化により発生した酸化物等の不純物の除去は、加熱によって溶着面を液体状態にし、鉛部１１１の自重で加圧する等して水平方向にその不純物を押し出すことにより行っているため、不純物の除去を確実に行うのが困難であるとともに、鉛部の沈下により製造精度が低下していた。さらに、はんだ層１１３の溶解温度は比較的高温であることから、加熱を充分に行うために、時間がかかり製造コストが割高になっていた。   By the way, the welding strength between the lead portion 111 and the flange portion 112 is required to be extremely high, and therefore it is necessary to weld both of them over the entire surface. However, even if the welding strength is measured by a mechanical test, the measurement is impossible because the lead portion 111 yields first. For this reason, it was necessary to visually confirm the welding. However, in the welding technique as described above, since the welding surface is expanded in the horizontal direction, the welding cannot be visually confirmed. Further, removal of impurities such as oxides generated by oxidation of lead is performed by extruding the impurities in the horizontal direction by making the welding surface into a liquid state by heating and pressurizing with the dead weight of the lead portion 111. In addition, it is difficult to reliably remove impurities, and the manufacturing accuracy is reduced due to the sinking of the lead portion. Furthermore, since the melting temperature of the solder layer 113 is relatively high, it takes a long time to sufficiently heat, and the manufacturing cost is expensive.

また、特許文献２に開示されているように、製造のための時間およびコストを低減するために、鉛部の成形、および鉛部とフランジ部との溶着を同時に行うことが考えられている。しかしながら、この場合も、溶着面が水平方向に拡がっていることから、鉛部およびフランジ部の溶着を目視によって確認することができなく、また、溶着面から不純物を取り除くことが困難であった。   Further, as disclosed in Patent Document 2, in order to reduce the time and cost for manufacturing, it is considered that the lead part is molded and the lead part and the flange part are welded at the same time. However, also in this case, since the welding surface is expanded in the horizontal direction, the welding of the lead portion and the flange portion cannot be visually confirmed, and it is difficult to remove impurities from the welding surface.

特開平１１−１７３３５９号公報（要約、図４）Japanese Patent Laid-Open No. 11-173359 (summary, FIG. 4)

したがって、本発明は、鉛部とフランジ部との溶着を目視によって確認しながら確実に行うことができ、かつ溶着面から不純物を容易に取り除くことができる鉛ダンパーの製造方法を提供することを目的としている。   Therefore, an object of the present invention is to provide a method for manufacturing a lead damper that can be reliably performed while visually confirming the welding between the lead portion and the flange portion, and that can easily remove impurities from the welding surface. It is said.

本発明の鉛ダンパーの製造方法は、鉛からなる鉛部と、この鉛部の上面および下面に設けられたフランジ部とを備えた鉛ダンパーの製造方法であって、フランジ部のうちの少なくとも一方を、鉛直方向に立設するようにして、鉛部を形成するための鋳型の側部に組み込んで、この鋳型の上部に開口部を形成し、この開口部から溶融された鉛を注入することにより、鉛部の成形を行うとともに、注入された鉛とフランジ部との溶着を行うことを特徴としている。   The lead damper manufacturing method of the present invention is a lead damper manufacturing method including a lead portion made of lead and flange portions provided on the upper surface and the lower surface of the lead portion, and at least one of the flange portions. Is installed in the side of the mold for forming the lead portion so as to stand in the vertical direction, an opening is formed in the upper portion of the mold, and molten lead is injected from the opening Thus, the lead portion is molded, and the injected lead and the flange portion are welded.

本発明の鉛ダンパーの製造方法では、フランジ部のうちの少なくとも一方を鉛直方向に立設して鋳型に組み込み、その鋳型の上部に形成された開口部から溶融された鉛を注入するので、注入された鉛とフランジ部との溶着面上端での溶着状態を目視によって確認しながら、鋳型の底部上面から上方へと順々に鉛部の成形を行うことができるとともに、鉛部とフランジ部との溶着を行うことができる。これにより、製造のための時間およびコストを低減することができるのはもちろんのこと、鉛部とフランジ部との溶着を確実に行うことができる。また、鉛部とフランジ部との溶着を行っている間、酸化物等の不純物が、比重差によって鉛部とフランジ部との溶着面上端に浮上するので、その不純物の除去を容易に行うことができる。さらに、従来のように鉛部の自重で加圧する等して水平方向にその不純物を押し出す必要がないことから、鉛部の沈下がなくなるので、製造精度を向上させることができる。   In the lead damper manufacturing method of the present invention, at least one of the flange portions is vertically installed and incorporated in a mold, and molten lead is injected from an opening formed in the upper portion of the mold. While confirming the welding state at the upper end of the welded surface between the lead and the flange portion by visual inspection, the lead portion can be molded sequentially from the upper surface of the bottom portion of the mold, and the lead portion and the flange portion. Can be welded. As a result, the time and cost for manufacturing can be reduced, and the lead portion and the flange portion can be reliably welded. Also, during welding of the lead part and the flange part, impurities such as oxides float to the upper end of the welding surface between the lead part and the flange part due to the difference in specific gravity, so that the impurity can be easily removed. Can do. Furthermore, since it is not necessary to extrude the impurities in the horizontal direction by pressurizing with the weight of the lead portion as in the prior art, the lead portion does not sink, so that the manufacturing accuracy can be improved.

ここで、フランジ部における注入された鉛と溶着される面には、予め錫メッキ処理を施すことが好適である。この場合、注入された溶融鉛とフランジ部との間で錫メッキが溶融することにより、錫および鉛が溶融されたホモゲン状態となり、次いで、これを冷却することにより、注入された溶融鉛とフランジ部とが溶着される。これにより、従来のように鉛部とフランジ部との間にはんだ層を形成し、はんだ層を溶解させるためにフランジ部の下面全体を高温で加熱する必要がないので、さらに製造のための時間とコストがかからない。   Here, it is preferable that the surface to be welded with the injected lead in the flange portion is subjected to tin plating in advance. In this case, the tin plating melts between the injected molten lead and the flange portion, so that the molten tin and lead become a homogen state, and then the injected molten lead and the flange are cooled. The part is welded. This eliminates the need to form a solder layer between the lead portion and the flange portion as in the prior art and to heat the entire lower surface of the flange portion at a high temperature in order to dissolve the solder layer. And no cost.

ここで、注入する溶融鉛の温度が錫メッキの融点より低い場合には、錫メッキを溶融させるための処理を行うことが望ましい。そこで、鉛部とフランジ部との溶着部を加熱するのが好適である。この場合、加熱手段を用いて、注入された溶融鉛およびフランジ部の溶着面上端を加熱することにより、より確実に溶着を行うことができる。加熱手段としては、バーナー等がある。   Here, when the temperature of the molten lead to be injected is lower than the melting point of the tin plating, it is desirable to perform a process for melting the tin plating. Therefore, it is preferable to heat the welded portion between the lead portion and the flange portion. In this case, the heating can be performed more reliably by heating the injected molten lead and the upper end of the welding surface of the flange portion. Examples of the heating means include a burner.

本発明の鉛ダンパーの製造方法よれば、フランジ部のうちの少なくとも一方を鉛直方向に立設して鋳型に組み込み、その鋳型の上部に形成された開口部から溶融された鉛を注入するので、注入された鉛およびフランジ部の溶着面上端での溶着状態を目視によって確認しながら、鋳型の底部上面から上方へと順々に鉛部の成形を行うことができるとともに、鉛部とフランジ部との溶着を行うことができる等の効果が得られる。   According to the lead damper manufacturing method of the present invention, at least one of the flange portions is vertically installed and incorporated in a mold, and molten lead is injected from an opening formed in the upper portion of the mold. While confirming the injected lead and the welding state at the top of the welding surface of the flange portion by visual observation, the lead portion can be molded in order from the upper surface of the bottom portion of the mold, and the lead portion and the flange portion. It is possible to obtain an effect such as being able to perform welding.

以下、本発明の一実施形態について図面を参照して説明する。図１〜図３は、本発明の一実施形態に係る鉛ダンパーの製造方法を説明するための概略図である。図１は、フランジ部１２，１３が立設されて金型２０に組み込まれた状態を示しており、（Ａ）はその状態の正面図、（Ｂ）はその状態の上面図である。図２は、鉛部１１を成形するとともに、鉛部１１とフランジ部１２，１３とを溶着している状態を示している側断面図である。図３は、本実施形態の鉛ダンパーの製造方法により製造された鉛ダンパー１０を示しており、（Ａ）は鉛ダンパー１０の上面図、（Ｂ）は鉛ダンパー１０の正面図である。なお、フランジ部１２，１３に設けられた取付孔１６，１７は、図３（Ｂ）にのみ示している。   Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 to 3 are schematic views for explaining a method of manufacturing a lead damper according to an embodiment of the present invention. FIG. 1 shows a state in which the flange portions 12 and 13 are erected and assembled in the mold 20, (A) is a front view of the state, and (B) is a top view of the state. FIG. 2 is a side sectional view showing a state in which the lead portion 11 is molded and the lead portion 11 and the flange portions 12 and 13 are welded. FIG. 3 shows the lead damper 10 manufactured by the lead damper manufacturing method of the present embodiment, where (A) is a top view of the lead damper 10 and (B) is a front view of the lead damper 10. In addition, the attachment holes 16 and 17 provided in the flange parts 12 and 13 are shown only in FIG.

まず、たとえば鋼材からなるフランジ部１２，１３の所定面１４，１５に錫メッキ処理を施す。次いで、図１（Ａ），（Ｂ）に示すように、フランジ部１２，１３を、金型（鋳型）２０の側部に組み込むことにより、キャビティＣを形成する。すなわち、金型２０は、キャビティＣの底面を閉塞する底板部２０ａと、キャビティＣの両側面を閉塞する側板部２０ｂとを備えている。そして、側板部２０ｂを挟むようにフランジ部１２，１３を配置することにより上面が開放されて、開口部２０Ａを有するキャビティＣが形成される。この場合、フランジ部１２，１３は、錫メッキ処理が施された所定面１４，１５が対向して垂直方向に立設された状態にある。   First, for example, tin plating is applied to the predetermined surfaces 14 and 15 of the flange portions 12 and 13 made of steel. Next, as shown in FIGS. 1A and 1B, the cavity C is formed by incorporating the flange portions 12 and 13 into the side portion of the mold (mold) 20. That is, the mold 20 includes a bottom plate portion 20 a that closes the bottom surface of the cavity C, and a side plate portion 20 b that closes both side surfaces of the cavity C. And by arrange | positioning the flange parts 12 and 13 so that the side-plate part 20b may be pinched | interposed, an upper surface is open | released and the cavity C which has 20 A of opening parts is formed. In this case, the flange portions 12 and 13 are in a state where the predetermined surfaces 14 and 15 subjected to the tin plating process face each other and are erected in the vertical direction.

次いで、図２に示すように、キャビティＣの開口部２０Ａから溶融された鉛を注入することにより、キャビティＣの底部上面から上方へと順々に鉛部１１の成形を行う。その際、フランジ部１２，１３の所定面１４，１５に施された錫メッキが溶融鉛によって溶融され、鉛と錫とが溶け合ってホモゲン溶着が生じる。ホモゲン溶着とは、錫および鉛を溶融したホモゲン状態を経由して、これら材料の合金層（図示略）を形成することにより、鉛部１１とフランジ部１２，１３とを溶着することをいい、鉛と錫とが溶け合う状態は目視で観察することができる。本実施形態のホモゲン溶着では、溶着面が鉛直方向を向いていることから、金型２０の内部におけるフランジ部１２，１３と鉛部１１との溶着面上端において、錫メッキおよび鉛が溶融している状態（ホモゲン状態）を目視によって逐次確認することができる。また、鉛の酸化に起因した酸化物等の不純物が、比重差によってフランジ部１２，１３と鉛部１１との溶着面の上端に浮上するので、たとえばヘラ等を用いてその不純物の除去を行うことができる。   Next, as shown in FIG. 2, molten lead is injected from the opening 20 </ b> A of the cavity C, thereby forming the lead portion 11 in order from the bottom upper surface of the cavity C upward. At that time, the tin plating applied to the predetermined surfaces 14 and 15 of the flange portions 12 and 13 is melted by the molten lead, and lead and tin are melted to cause homogen welding. Homogene welding refers to welding the lead portion 11 and the flange portions 12 and 13 by forming an alloy layer (not shown) of these materials via a homogen state in which tin and lead are melted. The state where lead and tin are melted can be visually observed. In the homogen welding of the present embodiment, since the welding surface is oriented in the vertical direction, tin plating and lead are melted at the upper end of the welding surface between the flange portions 12 and 13 and the lead portion 11 inside the mold 20. The state (homogen state) that is present can be sequentially confirmed by visual observation. Further, since impurities such as oxides resulting from lead oxidation float on the upper end of the welded surface between the flange portions 12 and 13 and the lead portion 11 due to the difference in specific gravity, the impurities are removed using, for example, a spatula or the like. be able to.

なお、本実施形態のホモゲン溶着において、小口バーナー３１，３２等の加熱手段を用いるのが好適である。この場合、注入された溶融鉛と錫メッキ処理が施された所定面１４，１５との溶着面上端近傍を加熱する。   In addition, in the homogen welding of this embodiment, it is preferable to use heating means such as the small burners 31 and 32. In this case, the vicinity of the upper end of the weld surface between the injected molten lead and the predetermined surfaces 14 and 15 subjected to tin plating is heated.

上記のようにして所定量の鉛を注入することにより、図３（Ａ），（Ｂ）に示すような鉛ダンパー１０が製造される。鉛ダンパー１０は、上部構造物および下部構造物（たとえば、上部の梁および下部の梁）の間に設置される。この場合、ボルト（図示略）により、フランジ部１２が取付孔１６を通じて上部構造物（図示略）に固定され、ボルト（図示略）により、フランジ部１３が取付孔１７を通じて下部構造物（図示略）に固定される。   The lead damper 10 as shown in FIGS. 3A and 3B is manufactured by injecting a predetermined amount of lead as described above. The lead damper 10 is installed between an upper structure and a lower structure (for example, an upper beam and a lower beam). In this case, the flange portion 12 is fixed to the upper structure (not shown) by the bolt (not shown) through the mounting hole 16, and the flange portion 13 is fixed by the bolt (not shown) through the mounting hole 17 to the lower structure (not shown). ).

本実施形態の鉛ダンパー１０では、フランジ部１２，１３を鉛直方向に立設して金型２０に組み込み、その金型２０の上部に形成された開口部２０Ａから溶融された鉛を注入するので、注入された鉛とフランジ部１２，１３との溶着面上端での溶着状態を目視によって確認しながら、金型２０の底部上面から上方へと順々に鉛部１１の成形を行うことができるとともに、鉛部１１とフランジ部１２，１３との溶着を行うことができる。これにより、製造のための時間およびコストを低減することができるのはもちろんのこと、鉛部１１とフランジ部１２，１３との溶着を確実に行うことができる。また、鉛部１１とフランジ部１２，１３との溶着を行っている間、酸化物等の不純物が、比重差によって鉛部１１とフランジ部１２，１３との溶着面上端に浮上するので、その不純物の除去を容易に行うことができる。さらに、従来のように鉛部の自重で加圧する等して水平方向にその不純物を押し出す必要がないことから、鉛部の沈下がなくなるので、製造精度を向上させることができる。   In the lead damper 10 of the present embodiment, the flange portions 12 and 13 are vertically installed and incorporated in the mold 20, and molten lead is injected from the opening 20 </ b> A formed in the upper portion of the mold 20. The lead part 11 can be molded in order from the bottom upper surface of the mold 20 to the upper side while visually confirming the welding state at the upper end of the welding surface between the injected lead and the flange parts 12 and 13. At the same time, the lead portion 11 and the flange portions 12 and 13 can be welded. As a result, the time and cost for manufacturing can be reduced, and the lead portion 11 and the flange portions 12 and 13 can be reliably welded. Further, while the lead portion 11 and the flange portions 12 and 13 are welded, impurities such as oxides float to the upper end of the weld surface between the lead portion 11 and the flange portions 12 and 13 due to the difference in specific gravity. Impurities can be easily removed. Furthermore, since it is not necessary to extrude the impurities in the horizontal direction by pressurizing with the weight of the lead portion as in the prior art, the lead portion does not sink, so that the manufacturing accuracy can be improved.

また、従来のように鉛部とフランジ部との間にはんだ層を形成し、はんだ層を溶解させるためにフランジ部の下面全体を高温で加熱する必要がないので、さらに製造のための時間とコストがかからない。さらに、小口バーナー３１，３２を用いて、注入された溶融鉛とフランジ部１２，１３との溶着面上端を加熱することにより、より確実に溶着を行うことができる。   In addition, it is not necessary to form a solder layer between the lead portion and the flange portion as in the prior art and to heat the entire lower surface of the flange portion at a high temperature in order to dissolve the solder layer. There is no cost. Furthermore, it is possible to perform the welding more reliably by heating the upper end of the welding surface between the injected molten lead and the flange portions 12 and 13 using the small burners 31 and 32.

以上、実施形態を挙げて本発明を説明したが、本発明は上記実施形態に限定されるものではなく、種々の変形が可能である。上記実施形態では、フランジ部１２，１３を金型２０の側部に組み込むようにしたが、フランジ部１２，１３のうちの一方を金型２０の側部に組み込むようにしてもよい。   While the present invention has been described with reference to the embodiments, the present invention is not limited to the above embodiments, and various modifications can be made. In the above embodiment, the flange portions 12 and 13 are incorporated in the side portion of the mold 20, but one of the flange portions 12 and 13 may be incorporated in the side portion of the mold 20.

本発明の一実施形態に係る鉛ダンパーの製造方法を説明するための図であり、（Ａ）は正面図、（Ｂ）は上面図である。It is a figure for demonstrating the manufacturing method of the lead damper which concerns on one Embodiment of this invention, (A) is a front view, (B) is a top view. 本発明の一実施形態に係る鉛ダンパーの製造方法を説明するための側断面図である。It is a sectional side view for demonstrating the manufacturing method of the lead damper which concerns on one Embodiment of this invention. 本発明の一実施形態に係る鉛ダンパーの製造方法により製造された鉛ダンパーを示しており、（Ａ）は鉛ダンパーの上面図、（Ｂ）は鉛ダンパーの正面図である。The lead damper manufactured by the manufacturing method of the lead damper concerning one embodiment of the present invention is shown, (A) is a top view of a lead damper and (B) is a front view of a lead damper. 従来の鉛ダンパーの製造方法を説明するための図である。It is a figure for demonstrating the manufacturing method of the conventional lead damper.

符号の説明Explanation of symbols

１０…鉛ダンパー、１１…鉛部、１２、１３…フランジ部、１４，１５…所定面、２０…金型（鋳型）、２０Ａ…開口部、３１，３２…小口バーナー（加熱手段）   DESCRIPTION OF SYMBOLS 10 ... Lead damper, 11 ... Lead part, 12, 13 ... Flange part, 14, 15 ... Predetermined surface, 20 ... Mold (mold), 20A ... Opening part, 31, 32 ... Small burner (heating means)

Claims (4)

鉛からなる鉛部と、この鉛部の上面および下面に設けられたフランジ部とを備えた鉛ダンパーの製造方法において、
前記フランジ部のうちの少なくとも一方を、鉛直方向に立設するようにして、前記鉛部を形成するための鋳型の側部に組み込んで、この鋳型の上部に開口部を形成し、この開口部から溶融された鉛を注入することにより、前記鉛部の成形を行うとともに、前記注入された鉛と前記フランジ部との溶着を行うことを特徴とする鉛ダンパーの製造方法。 In a lead damper manufacturing method comprising a lead portion made of lead and flange portions provided on the upper surface and the lower surface of the lead portion,
At least one of the flange portions is set up in the vertical direction so as to be incorporated into a side portion of the mold for forming the lead portion, and an opening is formed on the upper portion of the mold. A lead damper manufacturing method characterized in that the lead portion is molded by injecting molten lead from and the welded lead and the flange portion are welded. 前記フランジ部における前記注入された鉛と溶着される面には、予め錫メッキ処理が施されていることを特徴とする請求項１に記載の鉛ダンパーの製造方法。   The lead damper manufacturing method according to claim 1, wherein a surface of the flange portion to be welded with the injected lead is subjected to a tin plating process in advance. 前記鉛部と前記フランジ部との溶着において、加熱手段を用いて、前記注入された鉛と前記フランジ部との溶着面上端を加熱することを特徴とする請求項１または２に記載の鉛ダンパーの製造方法。   3. The lead damper according to claim 1, wherein in welding of the lead portion and the flange portion, an upper end of a welding surface between the injected lead and the flange portion is heated using a heating unit. 4. Manufacturing method. 前記加熱手段は、バーナーであることを特徴とする請求項１〜３のいずれかに記載の鉛ダンパーの製造方法。   The lead heating damper manufacturing method according to claim 1, wherein the heating means is a burner.
JP2004004145A 2004-01-09 2004-01-09 Manufacturing method of lead damper Expired - Lifetime JP4290017B2 (en)

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