JP2018090858A - Heat processing furnace - Google Patents

Heat processing furnace Download PDF

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JP2018090858A
JP2018090858A JP2016235434A JP2016235434A JP2018090858A JP 2018090858 A JP2018090858 A JP 2018090858A JP 2016235434 A JP2016235434 A JP 2016235434A JP 2016235434 A JP2016235434 A JP 2016235434A JP 2018090858 A JP2018090858 A JP 2018090858A
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insulating material
heat insulating
heat
workpiece
support member
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JP6817799B2 (en
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貴弘 藤田
Takahiro Fujita
貴弘 藤田
文隆 虻川
Fumitaka Abukawa
文隆 虻川
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Dowa Thermotech Co Ltd
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Dowa Thermotech Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To suppress variations in heat processing quality of a workpiece by reducing temperature variations in the workpiece during a heat treatment, which was caused by heat loss through a support member supporting the workpiece in a conventional heat processing furnace.SOLUTION: A first heat insulating material 11 provided in the furnace and a support member 4 for supporting a workpiece W are provided in a heat processing furnace 1 which performs a heat treatment of the workpiece W. An end portion of the support member 4 on a furnace shell side does not penetrate through the first heat insulating material 11 but is supported by the first heat insulating material 11.SELECTED DRAWING: Figure 1

Description

本発明は、自動車用部品や機械部品等のワークの熱処理を行う熱処理炉に関する。   The present invention relates to a heat treatment furnace for performing heat treatment of workpieces such as automobile parts and machine parts.

熱処理の一例である浸炭処理を行う炉として特許文献１や特許文献２に記載された真空浸炭炉がある。特許文献１の真空浸炭炉では、炉殻の内面に対向するように断熱材が設けられ、その断熱材を貫通するようにしてワークを支持する支持部材（炉床）が炉殻に取り付けられている。その支持部材の上端部にはトレイまたはバスケットに積載されたワークが配置されている。特許文献２の真空浸炭炉も同様に、炉殻の内面に沿って断熱材が設けられ、その断熱材を貫通するように設けられた架台が炉殻に接するように取り付けられている。ワークはその架台の上に配置されている。従来の炉では、ワークがこのように支持された状態で加熱処理や浸炭処理等が行われている。   There are vacuum carburizing furnaces described in Patent Document 1 and Patent Document 2 as furnaces that perform carburizing treatment, which is an example of heat treatment. In the vacuum carburizing furnace of Patent Document 1, a heat insulating material is provided so as to face the inner surface of the furnace shell, and a support member (furnace floor) that supports the work so as to penetrate the heat insulating material is attached to the furnace shell. Yes. A work loaded on a tray or basket is disposed at the upper end of the support member. Similarly, in the vacuum carburizing furnace of Patent Document 2, a heat insulating material is provided along the inner surface of the furnace shell, and a pedestal provided so as to penetrate the heat insulating material is attached so as to contact the furnace shell. The workpiece is placed on the frame. In a conventional furnace, a heat treatment, a carburizing treatment, or the like is performed with the workpiece supported in this manner.

特開２００６−１１２７７０号公報JP 2006-112770 A 特開２００９−５２８３８号公報JP 2009-52838 A

各ワークの熱処理後の品質ばらつきを抑えるためには、各ワークの熱処理中の処理条件が同一となることが望ましい。例えば熱処理中の各ワークへの入熱量を均一にして温度ばらつきを抑えることができれば、ワークの熱処理品質のばらつきも抑えることができる。   In order to suppress the quality variation after the heat treatment of each workpiece, it is desirable that the treatment conditions during the heat treatment of each workpiece are the same. For example, if the amount of heat input to each workpiece during heat treatment can be made uniform and temperature variations can be suppressed, variations in the heat treatment quality of the workpieces can also be suppressed.

しかしながら、従来の炉では、ワークを支持する支持部材が炉殻に接触するように取り付けられているために、支持部材を介した熱伝導による熱逃げが生じていた。これに伴い、治具上の支持部材近傍に配置されたワークと、その他の部分に配置されたワークで入熱量が互いに異なり、ワークごとに温度ばらつきが生じていた。これにより、同一ロットで熱処理される各ワークの熱処理品質にばらつきが生じていた。   However, in the conventional furnace, since the support member that supports the workpiece is attached so as to contact the furnace shell, heat escape due to heat conduction through the support member has occurred. Accordingly, the amount of heat input is different between the workpieces arranged in the vicinity of the support member on the jig and the workpieces arranged in other portions, and temperature variation occurs between the workpieces. As a result, the heat treatment quality of each workpiece heat-treated in the same lot varied.

本発明は、上記事情に鑑みてなされたものであり、熱処理中のワークの温度ばらつきを抑制してワークの熱処理品質のばらつきを抑制することを目的とする。   The present invention has been made in view of the above circumstances, and an object of the present invention is to suppress the variation in the heat treatment quality of the workpiece by suppressing the temperature variation of the workpiece during the heat treatment.

上記課題を解決する本発明は、ワークの熱処理を行う熱処理炉であって、炉内に設けられる第１の断熱材と、前記ワークを支持する支持部材とを備え、前記支持部材の炉殻側端部が前記第１の断熱材を貫通せずに該第１の断熱材に支持されていることを特徴としている。   The present invention for solving the above problems is a heat treatment furnace for heat-treating a workpiece, comprising a first heat insulating material provided in the furnace, and a support member for supporting the workpiece, the furnace shell side of the support member The end portion is supported by the first heat insulating material without penetrating the first heat insulating material.

本発明に係る熱処理炉によれば、ワークを支持する支持部材を介した熱逃げが抑制される。これにより、熱処理中のワークの温度ばらつきを抑制することができる。   According to the heat treatment furnace according to the present invention, heat escape via the support member that supports the workpiece is suppressed. Thereby, the temperature variation of the workpiece | work during heat processing can be suppressed.

本発明によれば、熱処理中のワークの温度ばらつきを抑制してワークの熱処理品質のばらつきを抑制することができる。   According to the present invention, it is possible to suppress the variation in the heat treatment quality of the workpiece by suppressing the temperature variation of the workpiece during the heat treatment.

本発明の実施形態に係る真空浸炭炉の概略構成を示す縦断面図である。It is a longitudinal section showing a schematic structure of a vacuum carburizing furnace concerning an embodiment of the present invention. 図１中のＡ−Ａ断面図である。It is AA sectional drawing in FIG. 本発明の他の実施形態に係る真空浸炭炉の概略構成を示す縦断面図である。It is a longitudinal cross-sectional view which shows schematic structure of the vacuum carburizing furnace which concerns on other embodiment of this invention. 本発明の他の実施形態に係る第２の断熱材の概略構成を示す図であり、図１中のＡ−Ａ断面図に相当する断面図である。It is a figure which shows schematic structure of the 2nd heat insulating material which concerns on other embodiment of this invention, and is sectional drawing equivalent to AA sectional drawing in FIG.

以下、本発明に係る実施形態について、図面を参照しながら説明する。なお、本明細書および図面において、実質的に同一の機能構成を有する要素においては、同一の符号を付することにより重複説明を省略する。   Hereinafter, embodiments according to the present invention will be described with reference to the drawings. In the present specification and drawings, elements having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

本実施形態では熱処理炉として真空浸炭炉を例に挙げて説明する。図１に示すように、本実施形態に係る真空浸炭炉１は、真空チャンバー２と、ワークＷが収容される断熱材ケース３と、断熱材ケース３の内側に設けられた第１の断熱材１１と、トレイ状の治具Ｊが載せられる奥行き方向Ｄ２（図１の紙面垂直方向）に延伸するレール２０と、レール２０および治具Ｊを介してワークＷを下方から支持する支持部材４を備えている。複数のワークＷが載せられた治具Ｊは、レール２０上を奥行き方向Ｄ２にスライド移動するようにして搬送される。 In this embodiment, a vacuum carburizing furnace will be described as an example of the heat treatment furnace. As shown in FIG. 1, a vacuum carburizing furnace 1 according to this embodiment includes a vacuum chamber 2, a heat insulating material case 3 in which a work W is accommodated, and a first heat insulating material provided inside the heat insulating material case 3. 11 and a rail 20 extending in the depth direction D 2 (in the direction perpendicular to the plane of FIG. 1) on which the tray-like jig J is placed, and a support member 4 that supports the workpiece W from below via the rail 20 and the jig J. It has. Jig J which a plurality of workpieces W are placed is transported to the rail 20 on so as to slide in the depth direction D 2.

断熱材ケース３は直方体状に形成され、素材として例えばＳＵＳ３１０Ｓ、ＳＵＳ３０４、ＳＳ４００等の金属が用いられる。断熱材ケース３は、炉殻２ａに設けられた搬入口（不図示）から搬入され、炉底に設けられた受け台５に載せられる。受け台５は板状部材やローラー等で構成される。   The heat insulating material case 3 is formed in a rectangular parallelepiped shape, and a metal such as SUS310S, SUS304, or SS400 is used as a material. The heat insulating material case 3 is carried in from a carry-in port (not shown) provided in the furnace shell 2a and placed on a cradle 5 provided in the furnace bottom. The cradle 5 is composed of a plate-like member, a roller or the like.

第１の断熱材１１は、断熱材ケース内の側壁部３ａ、底部３ｂおよび天井部３ｃの内面に沿って配置されている。以下の説明では、断熱材ケース側壁部３ａに配置された第１の断熱材１１を側壁部断熱材１１ａ、断熱材ケース底部３ｂに配置された第１の断熱材１１を底部断熱材１１ｂ、断熱材ケース天井部３ｃに配置された第１の断熱材１１を天井部断熱材１１ｃと称す。なお、第１の断熱材１１としては熱伝導を遮断し、断熱効果を得ることができればよく、例えば耐熱レンガ、セラミックボード、セラミックファイバー、真空断熱材、多孔質断熱材等が用いられる。   The 1st heat insulating material 11 is arrange | positioned along the inner surface of the side wall part 3a in the heat insulating material case, the bottom part 3b, and the ceiling part 3c. In the following description, the first heat insulating material 11 disposed on the heat insulating material case side wall 3a is the side heat insulating material 11a, the first heat insulating material 11 disposed on the heat insulating material case bottom 3b is the bottom heat insulating material 11b, and the heat insulating material. The 1st heat insulating material 11 arrange | positioned at the material case ceiling part 3c is called the ceiling part heat insulating material 11c. In addition, as the 1st heat insulating material 11, what is necessary is just to interrupt | block heat conduction and to obtain the heat insulation effect, for example, a heat-resistant brick, a ceramic board, a ceramic fiber, a vacuum heat insulating material, a porous heat insulating material etc. are used.

断熱材ケース３には、一方の側壁部３ａから挿入されるようにして断熱材ケース３の幅方向Ｄ１に延びるヒーター６が設けられている。ヒーター６はワークＷの上方および下方にそれぞれ配置され、断熱材ケース３の一方の側壁部３ａ（図１中の右側の側壁部）および側壁部断熱材１１ａを貫通し、他方の側壁部断熱材１１ａに先端部が埋設されるようにして固定されている。ヒーター６はＵ字状のものであり、平面視において治具Ｊに載せられた各ワークＷを覆うように断熱材ケース３の奥行き方向Ｄ２に沿って複数本設置されている。また、断熱材ケース３の他方の側壁部３ａ（図１中の左側の側壁部）には、断熱材ケース内の温度を測定する熱電対７が設けられている。熱電対７は、炉殻２ａ、断熱材ケース３の側壁部３ａおよび側壁部断熱材１１ａを貫通するようにして固定されている。熱電対７は断熱材ケース３を炉内に搬入した後で挿入される。なお、図１中のヒーター６は図面の簡略化のために二点鎖線で示している。 The heat insulator casing 3, a heater 6 extending in the width direction D 1 of the heat insulator casing 3 is provided so as to be inserted from one side wall portion 3a. The heater 6 is disposed above and below the workpiece W, passes through one side wall 3a (the right side wall in FIG. 1) and the side wall heat insulating material 11a of the heat insulating material case 3, and the other side wall heat insulating material. The tip is fixed so as to be embedded in 11a. Heater 6 is of U-shape and are parallelly disposed along the depth direction D 2 of the heat insulator casing 3 so as to cover the workpiece W placed on the jig J in a plan view. A thermocouple 7 for measuring the temperature in the heat insulating material case is provided on the other side wall portion 3a (the left side wall portion in FIG. 1) of the heat insulating material case 3. The thermocouple 7 is fixed so as to penetrate the furnace shell 2a, the side wall portion 3a of the heat insulating material case 3, and the side wall portion heat insulating material 11a. The thermocouple 7 is inserted after carrying the heat insulating material case 3 into the furnace. In addition, the heater 6 in FIG. 1 is shown with the dashed-two dotted line for simplification of drawing.

ワークＷを支持する支持部材４は、鉛直方向に延びるように形成され、断面形状は図２に示すように方形状となっている。また、支持部材４は所定の間隔で複数配置されている。支持部材４の素材としては例えばＳＵＳ３１０Ｓ等の金属や、ＳＣＨ２４等の耐熱鋼、ＷやＭｏ等の耐熱金属が用いられる。なお、治具Ｊの形状はトレイ状に限定されることはなく、バスケット状の治具や、階層状にワークＷが載せられる多段式の治具であっても良い。また、支持部材４の本数も特に限定されない。   The support member 4 that supports the workpiece W is formed so as to extend in the vertical direction, and the cross-sectional shape is rectangular as shown in FIG. A plurality of support members 4 are arranged at predetermined intervals. As the material of the support member 4, for example, a metal such as SUS310S, a heat-resistant steel such as SCH24, or a heat-resistant metal such as W or Mo is used. Note that the shape of the jig J is not limited to a tray shape, and may be a basket-shaped jig or a multistage jig on which the workpieces W are placed in a hierarchical shape. Further, the number of support members 4 is not particularly limited.

各支持部材４の下端部には、底部断熱材１１ｂに面接触することで支持部材４と底部断熱材１１ｂとの接触面積を増加させる端部プレート８が設けられている。端部プレート８の素材としては例えばＳＵＳ３１０Ｓ等の金属や、ＳＣＨ２４等の耐熱鋼、ＷやＭｏ等の耐熱金属が用いられる。端部プレート８には座ぐりが形成されており、支持部材４の下端部に固定されたピン９がその座ぐりに嵌め込まれることで、支持部材４と端部プレート８とが着脱自在に固定されている。   An end plate 8 is provided at the lower end of each support member 4 to increase the contact area between the support member 4 and the bottom heat insulating material 11b by making surface contact with the bottom heat insulating material 11b. As the material of the end plate 8, for example, a metal such as SUS310S, a heat resistant steel such as SCH24, or a heat resistant metal such as W or Mo is used. The end plate 8 has a counterbore, and the pin 9 fixed to the lower end portion of the support member 4 is fitted into the counterbore, so that the support member 4 and the end plate 8 are detachably fixed. Has been.

底部断熱材１１ｂの上面部には端部プレート８のサイズに合わせて複数の凹部が形成され、端部プレート８はその凹部内の底面に接している。このように各支持部材４の下端部に端部プレート８が設けられていることで、ワークＷや治具Ｊ、レール２０の重量を面で受けることが可能となる。これにより、治具Ｊの支持姿勢を安定させることができると共に、底部断熱材１１ｂの割れ等の発生を抑制することができる。また、端部プレート８を底部断熱材１１ｂの凹部内に設ける構成であるため、端部プレート８の設置時の位置決めを容易に行うことができる。なお、ワークＷや治具Ｊ等の重量、支持部材４の本数および底部断熱材１１ｂの強度等に応じ、支持部材４の下端部に端部プレート８を設けてなくても良い。例えば支持部材４の本数が多ければ、ワークＷや治具Ｊ、レール２０の重量が分散して底部断熱材１１ｂに伝わるため、端部プレート８を設けなくても底部断熱材１１ｂの割れが起きにくくなる。また、本実施形態では、底部断熱材１１ｂに凹部を設けることとしたが、支持部材４の下端部に凹部を設け、底部断熱材１１ｂの上面部に凸部を設けて嵌合してもよい。   A plurality of recesses are formed in the upper surface portion of the bottom heat insulating material 11b according to the size of the end plate 8, and the end plate 8 is in contact with the bottom surface in the recess. Thus, by providing the end plate 8 at the lower end of each support member 4, the weight of the workpiece W, the jig J, and the rail 20 can be received by the surface. Thereby, while being able to stabilize the support posture of the jig | tool J, generation | occurrence | production of the crack of the bottom part heat insulating material 11b, etc. can be suppressed. Moreover, since it is the structure which provides the edge part plate 8 in the recessed part of the bottom part heat insulating material 11b, the positioning at the time of installation of the edge part plate 8 can be performed easily. The end plate 8 may not be provided at the lower end portion of the support member 4 according to the weight of the workpiece W, the jig J, etc., the number of the support members 4 and the strength of the bottom heat insulating material 11b. For example, if the number of the support members 4 is large, the weight of the workpiece W, the jig J, and the rail 20 is dispersed and transmitted to the bottom heat insulating material 11b, so that the bottom heat insulating material 11b is cracked without providing the end plate 8. It becomes difficult. Moreover, in this embodiment, although the recessed part was provided in the bottom part heat insulating material 11b, a recessed part may be provided in the lower end part of the supporting member 4, and a convex part may be provided in the upper surface part of the bottom heat insulating material 11b, and it may fit. .

図１、図２に示すように断熱材ケース３の底部３ｂには、底部断熱材１１ｂの他に、支持部材４の端部プレート８の上面を覆う第２の断熱材１２が設けられている。第２の断熱材１２は、断熱材ケース３の奥行き方向Ｄ２に沿って長くなっており、奥行き方向Ｄ２に並ぶ一群の各支持部材４を１枚の断熱材で覆っている。第２の断熱材１２には支持部材４の形状に合わせた開口部１２ａが形成されている。第２の断熱材１２を端部プレート８に配置する際には、支持部材４を底部断熱材１１ｂに設置した後、第２の断熱材１２の開口部１２ａを支持部材４に通すようにして端部プレート８の上面に第２の断熱材１２を載せる。 As shown in FIGS. 1 and 2, the bottom 3b of the heat insulating material case 3 is provided with a second heat insulating material 12 that covers the upper surface of the end plate 8 of the support member 4 in addition to the bottom heat insulating material 11b. . The second heat insulating material 12 is longer along the depth direction D 2 of the heat insulator casing 3 and covers the group of the support members 4 arranged in the depth direction D 2 by a single insulation. The second heat insulating material 12 is formed with an opening 12 a that matches the shape of the support member 4. When the second heat insulating material 12 is disposed on the end plate 8, after the support member 4 is installed on the bottom heat insulating material 11 b, the opening 12 a of the second heat insulating material 12 is passed through the support member 4. The second heat insulating material 12 is placed on the upper surface of the end plate 8.

第２の断熱材１２が設けられることによりヒーター６の輻射熱を反射する端部プレート８の上面を覆うことになり、各ワークＷへの入熱量のばらつきを抑制することができる。また、第２の断熱材１２が設けられていることで、底部断熱材１１ｂの熱収縮による変形を抑えることができ、ワークＷとヒーター６の位置のばらつきを抑えることができる。それにより各ワークＷへの入熱量のばらつきを抑制することができる。さらにまた、第２の断熱材１２が設けられていることで、底部断熱材１１ｂのスーティングを抑えることができ、底部断熱材１１ｂの補修頻度を低くできる。その結果、支持部材４を底部断熱材１１ｂの上面に配置したまま炉内を補修することが可能となるため、補修作業効率を上げることができる。第２の断熱材１２を設けることは必須ではないが、ワークＷの温度ばらつきを抑制する観点からは第２の断熱材１２を設けることが好ましい。なお、第２の断熱材１２としては熱伝導を遮断し、断熱効果を得ることができればよく、例えば耐熱レンガ、セラミックボード、セラミックファイバー、真空断熱材、多孔質断熱材等が用いられる。また、底部断熱材１１ｂには硬くて圧縮強度と加工精度が高い断熱材を用い、第２の断熱材１２には底部断熱材１１ｂより断熱性に優れた断熱材を用いる等、第２の断熱材１２と第１の断熱材１１の材質は異なっていてもよい。これにより、ワークＷや治具Ｊ、レール２０の自重を支える底部断熱材１１ｂの割れが発生し難くなると共に、第２の断熱材１２により十分な断熱性を確保することができる。   By providing the second heat insulating material 12, the upper surface of the end plate 8 that reflects the radiant heat of the heater 6 is covered, and variations in the amount of heat input to each workpiece W can be suppressed. In addition, since the second heat insulating material 12 is provided, deformation due to thermal contraction of the bottom heat insulating material 11b can be suppressed, and variations in the positions of the workpiece W and the heater 6 can be suppressed. Thereby, variation in the amount of heat input to each workpiece W can be suppressed. Furthermore, since the second heat insulating material 12 is provided, sooting of the bottom heat insulating material 11b can be suppressed, and the repair frequency of the bottom heat insulating material 11b can be reduced. As a result, the inside of the furnace can be repaired while the support member 4 is disposed on the upper surface of the bottom heat insulating material 11b, so that the repair work efficiency can be increased. Although it is not essential to provide the second heat insulating material 12, it is preferable to provide the second heat insulating material 12 from the viewpoint of suppressing the temperature variation of the workpiece W. In addition, as the 2nd heat insulating material 12, what is necessary is just to interrupt | block heat conduction and to obtain the heat insulation effect, for example, a heat-resistant brick, a ceramic board, a ceramic fiber, a vacuum heat insulating material, a porous heat insulating material etc. are used. In addition, a second heat insulating material such as a heat insulating material that is hard and has high compressive strength and high processing accuracy is used for the bottom heat insulating material 11b, and a heat insulating material that has higher heat insulating properties than the bottom heat insulating material 11b is used for the second heat insulating material 12. The material of the material 12 and the first heat insulating material 11 may be different. Thereby, cracking of the bottom heat insulating material 11b that supports the weight of the workpiece W, the jig J, and the rail 20 is difficult to occur, and sufficient heat insulating properties can be secured by the second heat insulating material 12.

本実施形態では、断熱材ケース３の底部３ｂにおいて、底部断熱材１１ｂの上面の、第２の断熱材１２が設けられていない部分に第３の断熱材１３が設けられている。第３の断熱材１３は、第２の断熱材１２と側壁部断熱材１１ａとの隙間を埋めるように敷き詰められ、第３の断熱材１３の上面と第２の断熱材１２の上面が同一（略同一を含む）の高さとなるように配置されている。このような第３の断熱材１３が設けられることで、ワーク下方におけるヒーター６と断熱材の距離が一定となり、各ワークＷをより均一に加熱することができる。第３の断熱材１３を設けることは必須ではないが、ワークＷの温度ばらつきを抑制する観点からは第３の断熱材１３を設けることが好ましい。なお、第３の断熱材１３としては熱伝導を遮断し、断熱効果を得ることができればよく、例えば耐熱レンガ、セラミックボード、セラミックファイバー、真空断熱材、多孔質断熱材等が用いられる。また、第３の断熱材１３と第２の断熱材１２とが一体に形成されていても良い。
In the present embodiment, in the bottom 3b of the heat insulating material case 3, the third heat insulating material 13 is provided in a portion of the upper surface of the bottom heat insulating material 11b where the second heat insulating material 12 is not provided. The third heat insulating material 13 is spread so as to fill a gap between the second heat insulating material 12 and the side wall heat insulating material 11a, and the upper surface of the third heat insulating material 13 and the upper surface of the second heat insulating material 12 are the same ( (Including substantially the same). By providing the third heat insulating material 13 as described above, the distance between the heater 6 and the heat insulating material below the work becomes constant, and each work W can be heated more uniformly. Although it is not essential to provide the third heat insulating material 13, it is preferable to provide the third heat insulating material 13 from the viewpoint of suppressing the temperature variation of the workpiece W. In addition, as the third heat insulating material 13, it is only necessary to block heat conduction and obtain a heat insulating effect. For example, heat-resistant bricks, ceramic boards, ceramic fibers, vacuum heat insulating materials, porous heat insulating materials, and the like are used. Moreover, the 3rd heat insulating material 13 and the 2nd heat insulating material 12 may be integrally formed.

本実施形態に係る真空浸炭炉１は以上のように構成されている。なお、説明は省略しているが、真空浸炭炉１は、断熱材ケース内に処理ガスを供給するガスインレットや、炉内を真空排気する排気管および真空ポンプ等の真空浸炭処理の実施に必要な構成を備えている。   The vacuum carburizing furnace 1 according to the present embodiment is configured as described above. Although explanation is omitted, the vacuum carburizing furnace 1 is necessary for carrying out vacuum carburizing processing such as a gas inlet for supplying a processing gas into the heat insulating material case, an exhaust pipe for evacuating the inside of the furnace, and a vacuum pump. It has a simple configuration.

本実施形態の真空浸炭炉１によれば、ワークＷを下方から支持する支持部材４の下端部が底部断熱材１１ｂに接触した状態で熱処理が実施される。換言すると、支持部材４の下端部が断熱材ケース３や炉殻２ａに接触していない状態で熱処理が実施される。これにより、ワークＷの加熱処理や浸炭処理といった熱処理中において支持部材４を介した熱伝導による熱逃げが抑制され、各ワークＷの温度ばらつきを抑制することが可能となる。その結果、各ワークＷの熱処理品質のばらつきを抑制することができる。   According to the vacuum carburizing furnace 1 of the present embodiment, the heat treatment is performed in a state where the lower end portion of the support member 4 that supports the workpiece W from below is in contact with the bottom heat insulating material 11b. In other words, the heat treatment is performed in a state where the lower end portion of the support member 4 is not in contact with the heat insulating material case 3 or the furnace shell 2a. Thereby, heat escape due to heat conduction through the support member 4 during heat treatment such as heat treatment or carburization treatment of the workpiece W is suppressed, and temperature variation of each workpiece W can be suppressed. As a result, variation in the heat treatment quality of each workpiece W can be suppressed.

なお、本実施形態では、第１の断熱材１１に凹部内底面を設け、その凹部内底面にワークＷの支持部材４を接触させることとしたが、第１の断熱材１１に凹部を設けず、第１の断熱材１１の上面にワークＷの支持部材４を接触させることにしても良い。また、ワークＷの個数も限定されない。例えば、サイズの大きなワークＷを浸炭処理する場合、支持部材４を介して熱逃げが発生する従来の浸炭炉では、１つのワークＷの中でも部位ごとに浸炭ばらつきが生じる。一方、本実施形態のような浸炭炉であれば、そのようなワークＷを浸炭処理する場合でも熱逃げ抑制の効果が得られるため、ワークＷの部位ごとの浸炭ばらつきを抑制することができる。   In the present embodiment, the first heat insulating material 11 is provided with the inner bottom surface of the recess, and the support member 4 of the workpiece W is brought into contact with the inner bottom surface of the concave portion. However, the first heat insulating material 11 is not provided with the concave portion. The support member 4 of the workpiece W may be brought into contact with the upper surface of the first heat insulating material 11. Further, the number of workpieces W is not limited. For example, when carburizing a workpiece W having a large size, in a conventional carburizing furnace in which heat escape occurs via the support member 4, variation in carburization occurs for each part in one workpiece W. On the other hand, in the case of the carburizing furnace as in this embodiment, even when such a workpiece W is carburized, the effect of suppressing thermal escape can be obtained, so that variation in carburization for each part of the workpiece W can be suppressed.

また、本実施形態では、ワークＷの支持構造として支持部材４の上端部がレール２０の下面に接し、支持部材４の下端部が底部断熱材１１ｂに接するように構成したが、ワークＷの支持構造はこれに限定されない。ワークＷを一定時間、熱処理領域に保持しておくことができれば他の支持構造であっても良い。即ち、支持部材４の端部（上記実施形態ではワーク側端部４ａと炉殻側端部４ｂ）のうち、炉殻側端部４ｂが、第１の断熱材１１を貫通せず、断熱材ケース３との間に第１の断熱材１１が介在するように支持されていれば、他の支持構造であっても支持部材４を介した熱逃げを抑制することができる。また、支持部材４の炉殻側端部４ｂと断熱材ケース３との間に第１の断熱材１１が介在していることにより、外乱の影響も受けにくくなり、熱処理品質を向上させることができる。   In the present embodiment, the support structure of the workpiece W is configured such that the upper end portion of the support member 4 is in contact with the lower surface of the rail 20 and the lower end portion of the support member 4 is in contact with the bottom heat insulating material 11b. The structure is not limited to this. Other support structures may be used as long as the workpiece W can be held in the heat treatment region for a certain period of time. That is, out of the end portions of the support member 4 (in the above embodiment, the workpiece side end portion 4a and the furnace shell side end portion 4b), the furnace shell side end portion 4b does not penetrate the first heat insulating material 11, and the heat insulating material. If it is supported so that the first heat insulating material 11 is interposed between the case 3 and the other support structures, heat escape via the support member 4 can be suppressed. Further, since the first heat insulating material 11 is interposed between the furnace shell side end portion 4b of the support member 4 and the heat insulating material case 3, it is difficult to be affected by disturbance, and the heat treatment quality can be improved. it can.

また、本実施形態では、炉内にワークＷを収容する断熱材ケース３を設ける構成としたが、図３のように断熱材ケース３を設けない構成としても良い。このような構成であっても、ワークＷを支持する支持部材４が炉殻２ａに接触しない構成、即ち、支持部材４の炉殻側端部４ｂと炉殻２ａとの間に第１の断熱材１１が介在する構成であれば、支持部材４を介した熱逃げの抑制や外乱の影響を受けにくいといった効果を得ることができる。ただし、例えば断熱材の補修作業が必要になった場合、炉殻内面に断熱材を配置する構成の炉では、断熱材の補修作業の実施中に炉を使用することができず、生産性が低下することになる。一方、断熱材ケース３を設ける構成の炉では、１つの断熱材ケース３の補修作業中に他の断熱材のケースを用いて熱処理を行うことができ、生産性の低下を抑えることが可能となる。この観点からは断熱材ケース３を設けることが好ましい。   Moreover, in this embodiment, although it was set as the structure which provides the heat insulating material case 3 which accommodates the workpiece | work W in a furnace, it is good also as a structure which does not provide the heat insulating material case 3 like FIG. Even in such a configuration, the support member 4 that supports the workpiece W is not in contact with the furnace shell 2a, that is, the first heat insulation between the furnace shell side end portion 4b of the support member 4 and the furnace shell 2a. If it is the structure which the material 11 interposes, the effect that it will be hard to receive the influence of suppression of the heat escape through the support member 4, and a disturbance will be acquired. However, for example, when it is necessary to repair the heat insulating material, in a furnace configured to arrange the heat insulating material on the inner surface of the furnace shell, the furnace cannot be used while the heat insulating material is being repaired. Will be reduced. On the other hand, in the furnace configured to provide the heat insulating material case 3, heat treatment can be performed using the case of the other heat insulating material during repair work of one heat insulating material case 3, and it is possible to suppress a decrease in productivity. Become. From this viewpoint, it is preferable to provide the heat insulating material case 3.

また、本実施形態では、断熱材ケース３の奥行き方向Ｄ２に並ぶ一群の支持部材４を１枚の第２の断熱材１２で覆うこととしたが、例えば図４に示すように複数枚の第２の断熱材１２で覆うことにしても良い。複数枚の第２の断熱材１２を設けることで、開口部１２ａの位置精度が低くても、各第２の断熱材１２を支持部材４に通すことができる。これにより、第２の断熱材１２の設置時の作業効率が向上する。さらに、ワークＷと第２の断熱材１２との間にワークＷを加熱するヒーター６が配置される場合、ヒーター６の素線間の間隔に合わせて第２の断熱材１２を、ヒーター６の素線間を通過可能な形状にすることが好ましい。これにより、着脱自在に固定された支持部材４を取り外した後に第２の断熱材１２を持ち上げ、傾けることでヒーター６の素線間を通して抜き取ることが可能となる。これにより、ヒーター６を取り外すことなく、第２の断熱材１２の補修作業を行うことができる。 Further, in the present embodiment, it is assumed that covering a group of support members 4 arranged in the depth direction D 2 of the heat insulator casing 3 in the second heat insulating material 12 of one, for example a plurality as shown in FIG. 4 The second heat insulating material 12 may be covered. By providing a plurality of second heat insulating materials 12, each second heat insulating material 12 can be passed through the support member 4 even if the positional accuracy of the opening 12 a is low. Thereby, the work efficiency at the time of installation of the 2nd heat insulating material 12 improves. Furthermore, when the heater 6 for heating the workpiece W is disposed between the workpiece W and the second heat insulating material 12, the second heat insulating material 12 is attached to the heater 6 in accordance with the interval between the strands of the heater 6. It is preferable to make it the shape which can pass between strands. Thereby, after removing the support member 4 fixed detachably, the 2nd heat insulating material 12 can be lifted and it can extract through between the strands of the heater 6 by inclining. Thereby, the repair work of the 2nd heat insulating material 12 can be performed, without removing the heater 6. FIG.

以上、本発明の好適な実施形態について説明したが、本発明はかかる例に限定されない。当業者であれば、特許請求の範囲に記載された技術的思想の範疇内において、各種の変更例または修正例に想到しうることは明らかであり、それらについても当然に本発明の技術的範囲に属するものと了解される。   As mentioned above, although preferred embodiment of this invention was described, this invention is not limited to this example. It is obvious for those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea described in the claims. It is understood that it belongs to.

本発明は、真空浸炭炉に適用することができる。また、本発明は、真空浸炭炉以外にも、ガス浸炭等の他の方法で浸炭処理する浸炭炉や、ガス窒化処理やガス軟窒化処理等を行う窒化処理炉に適用することもできる。即ち、本発明は、ワークの加熱を要する熱処理を行う熱処理炉に適用することができる。   The present invention can be applied to a vacuum carburizing furnace. In addition to the vacuum carburizing furnace, the present invention can also be applied to a carburizing furnace that performs carburizing by other methods such as gas carburizing, and a nitriding furnace that performs gas nitriding or gas soft nitriding. That is, the present invention can be applied to a heat treatment furnace that performs heat treatment that requires heating of a workpiece.

１ 真空浸炭炉
２ 真空チャンバー
２ａ 炉殻
３ 断熱材ケース
３ａ 断熱材ケースの側壁部
３ｂ 断熱材ケースの底部
３ｃ 断熱材ケースの天井部
４ 支持部材
４ａ 支持部材のワーク側端部
４ｂ 支持部材の炉殻側端部
５ 受け台
６ ヒーター
７ 熱電対
８ 端部プレート
９ ピン
１１ 第１の断熱材
１１ａ 側壁部断熱材
１１ｂ 底部断熱材
１１ｃ 天井部断熱材
１２ 第２の断熱材
１２ａ 第２の断熱材の開口部
１３ 第３の断熱材
２０ レール
Ｄ１ 断熱材ケースの幅方向
Ｄ２ 断熱材ケースの奥行き方向
Ｊ 治具
Ｗ ワーク DESCRIPTION OF SYMBOLS 1 Vacuum carburizing furnace 2 Vacuum chamber 2a Furnace shell 3 Heat insulation material case 3a Side wall part 3b of a heat insulation material case Bottom part 3c of a heat insulation material case 4 Ceiling part 4 of a heat insulation material case 4 Support member 4a Work piece side edge 4b of a support member Shell side end 5 Receiving base 6 Heater 7 Thermocouple 8 End plate 9 Pin 11 First heat insulating material 11a Side wall heat insulating material 11b Bottom heat insulating material 11c Ceiling heat insulating material 12 Second heat insulating material 12a Second heat insulating material Opening portion 13 Third heat insulating material 20 Rail D 1 Insulating material case width direction D 2 Insulating material case depth direction J Jig W Workpiece

Claims (6)

ワークの熱処理を行う熱処理炉であって、
炉内に設けられる第１の断熱材と、
前記ワークを支持する支持部材とを備え、
前記支持部材の炉殻側端部が前記第１の断熱材を貫通せずに該第１の断熱材に支持されている、熱処理炉。 A heat treatment furnace for heat treating a workpiece,
A first heat insulating material provided in the furnace;
A support member for supporting the workpiece,
A heat treatment furnace in which a furnace shell side end portion of the support member is supported by the first heat insulating material without penetrating the first heat insulating material. 第２の断熱材が前記第１の断熱材に重ねて配置されている、請求項１に記載の熱処理炉。   The heat treatment furnace according to claim 1, wherein a second heat insulating material is disposed so as to overlap the first heat insulating material. 前記支持部材は前記ワークを下方から支持するように設けられ、
前記支持部材の下端部に、前記第１の断熱材に面接触する端部プレートが設けられている、請求項１又は２に記載の熱処理炉。 The support member is provided to support the workpiece from below,
The heat treatment furnace according to claim 1, wherein an end plate that is in surface contact with the first heat insulating material is provided at a lower end portion of the support member. 前記第１の断熱材に重ねて配置される第２の断熱材が前記端部プレートの上面を覆うように設けられている、請求項３に記載の熱処理炉。   The heat treatment furnace according to claim 3, wherein a second heat insulating material disposed so as to overlap the first heat insulating material is provided so as to cover an upper surface of the end plate. 前記第１の断熱材の上面において、前記第２の断熱材が設けられていない部分に第３の断熱材が設けられている、請求項４に記載の熱処理炉。   5. The heat treatment furnace according to claim 4, wherein a third heat insulating material is provided in a portion where the second heat insulating material is not provided on an upper surface of the first heat insulating material. 前記ワークが収容される断熱材ケースを備え、
前記第１の断熱材は前記断熱材ケースの内側に設けられている、請求項１〜５のいすれか一項に記載の熱処理炉。 Comprising a heat insulating material case in which the workpiece is accommodated;
The heat treatment furnace according to any one of claims 1 to 5, wherein the first heat insulating material is provided inside the heat insulating material case.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53141114A (en) * 1977-05-16 1978-12-08 Aichi Steel Works Ltd Heat treating method combined heating furnace and gradually cooling cover
JPS58189318A (en) * 1982-04-28 1983-11-05 Mazda Motor Corp Electric heating type heat treatment furnace
JPS58168556U (en) * 1982-04-30 1983-11-10 マツダ株式会社 heat treatment furnace
JP2004308941A (en) * 2003-04-02 2004-11-04 Saint-Gobain Tm Kk Supporting structure of thermal insulation member in high temperature microwave heating furnace
JP2010280948A (en) * 2009-06-04 2010-12-16 Toyo Tanso Kk Tantalum member and method for carburizing the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53141114A (en) * 1977-05-16 1978-12-08 Aichi Steel Works Ltd Heat treating method combined heating furnace and gradually cooling cover
JPS58189318A (en) * 1982-04-28 1983-11-05 Mazda Motor Corp Electric heating type heat treatment furnace
JPS58168556U (en) * 1982-04-30 1983-11-10 マツダ株式会社 heat treatment furnace
JP2004308941A (en) * 2003-04-02 2004-11-04 Saint-Gobain Tm Kk Supporting structure of thermal insulation member in high temperature microwave heating furnace
JP2010280948A (en) * 2009-06-04 2010-12-16 Toyo Tanso Kk Tantalum member and method for carburizing the same

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