JP5893441B2

JP5893441B2 - Camshaft sintering jig

Info

Publication number: JP5893441B2
Application number: JP2012044689A
Authority: JP
Inventors: 壮治田中
Original assignee: Nippon Piston Ring Co Ltd
Current assignee: Nippon Piston Ring Co Ltd
Priority date: 2012-02-29
Filing date: 2012-02-29
Publication date: 2016-03-23
Anticipated expiration: 2032-02-29
Also published as: JP2013181191A; KR20130099883A; KR101443504B1

Description

本件発明は、カムシャフト焼結用治具に関し、更に詳しくは、カムロブ等の組付部材が取り付けられたカムシャフトを焼結処理するときに用いられるカムシャフト焼結用治具に関するものである。 The present invention relates to a camshaft sintering jig, and more particularly to a camshaft sintering jig used when sintering a camshaft to which an assembly member such as a cam lobe is attached.

所謂、焼結製カムシャフトは、鋼製のシャフトにカムロブ等の焼結用材料で形成された部材が拡散結合により一体化したものである。この焼結製カムシャフトは、カムロブ等の焼結用材料で形成された部材を鋼製のシャフトに嵌合して組み付けたものを、高温雰囲気の焼結炉内で焼結処理して作製されるものである。ここで、焼結製カムシャフトを作製する場合には、カムロブ等がシャフトに嵌合して組み付けられた状態のカムシャフトを載せるための焼結用治具が必要になる。ちなみに、カムシャフト焼結用治具には、従来より高温強度に優れて変形し難いカーボン材からなるものが用いられている。また、カムシャフト焼結用治具において、カムシャフトと接触する部分には、従来より主にセラミックス材が用いられている。なお、カムシャフトを焼結するために用いられる治具として、例えば特許文献１に記載のカムシャフト焼結用治具が知られる。 A so-called sintered camshaft is a steel shaft in which members formed of a sintering material such as a cam lobe are integrated by diffusion bonding. This sintered camshaft is made by sintering a member made of a sintering material such as a cam lobe and fitting it in a steel shaft in a sintering furnace in a high temperature atmosphere. Is. Here, when a sintered camshaft is manufactured, a sintering jig for mounting the camshaft in a state in which a cam lobe or the like is fitted and assembled to the shaft is required. Incidentally, as a camshaft sintering jig, a jig made of a carbon material that is superior in high temperature strength and hardly deformed is used. Further, in the camshaft sintering jig, a ceramic material has been mainly used for a portion in contact with the camshaft. As a jig used for sintering the camshaft, for example, a camshaft sintering jig described in Patent Document 1 is known.

特許文献１に記載されたカムシャフト焼結用治具は、カムロブを含む組付部材が組み付けられたカムシャフトを焼結処理するときに用いられるカムシャフト焼結用治具であって、対向する２辺を少なくとも有する枠体と、載置されたカムシャフトを支持する２つ以上の支持部材とからなり、前記支持部材は、前記枠体の２辺間に配置されていると共に、当該枠体に形成された取付孔に調節可能に取り付けられていることを特徴としたものである。特許文献１における、カムシャフト焼結用治具は、シャフト長さや、カムロブやジャーナルの組付位置の異なる多品種のカムシャフトを効率的に焼結処理することを可能としたものである。また、特許文献１におけるカムシャフト焼結用治具は、数多く段積みすることが出来るので、従来よりも焼結効率の向上を図ることが可能である。 The camshaft sintering jig described in Patent Document 1 is a camshaft sintering jig used when sintering a camshaft to which an assembly member including a cam lobe is assembled, and is opposed to the camshaft sintering jig. It consists of a frame having at least two sides and two or more support members for supporting the mounted camshaft, and the support member is disposed between the two sides of the frame, and the frame It is characterized in that it is adjustably attached to the attachment hole formed in. The camshaft sintering jig in Patent Document 1 enables efficient sintering of various types of camshafts having different shaft lengths and cam lobe and journal assembly positions. Moreover, since many camshaft sintering jigs in Patent Document 1 can be stacked, it is possible to improve the sintering efficiency as compared with the conventional one.

特許第４１３７０３６号公報Japanese Patent No. 4137036

しかし、特許文献１のカムシャフト焼結用治具は、カムシャフトを支持する支持部材の両端に突出する取り付け部が、枠体に形成された支持部材取り付け孔に挿入されて取り付けられる構造を備えたものであり、当該支持部材がその長手方向の両端部のみで支持されるものである。従って、特許文献１のカムシャフト焼結用治具においては、載置されるカムシャフトの重みによる変形や破損等を防止するために、当該取り付け部の当該カムシャフト焼結用治具の高さ方向における厚みを確保する必要があった。すなわち、特許文献１のカムシャフト焼結用治具は、支持部材の取り付け部の当該カムシャフト焼結用治具の高さ方向の厚みを厚くする分カムシャフトの載置位置が高くなり、それに応じて枠体の高さも高くしなければならず、より多くカムシャフト焼結用治具を積み重ねたい場合に障害となってしまう。 However, the camshaft sintering jig of Patent Document 1 has a structure in which attachment portions projecting at both ends of a support member that supports the camshaft are inserted and attached to support member attachment holes formed in the frame body. The support member is supported only at both ends in the longitudinal direction. Therefore, in the camshaft sintering jig of Patent Document 1, the height of the camshaft sintering jig of the mounting portion is prevented in order to prevent deformation or breakage due to the weight of the mounted camshaft. It was necessary to ensure the thickness in the direction. That is, in the camshaft sintering jig of Patent Document 1, the mounting position of the camshaft is increased by increasing the thickness in the height direction of the camshaft sintering jig at the mounting portion of the support member. Accordingly, it is necessary to increase the height of the frame body, which becomes an obstacle when it is desired to stack more camshaft sintering jigs.

以上のことから、本件発明は、上記の問題を解決するためになされたものであって、従来よりも生産性の向上を図ることが可能なカムシャフト焼結用治具の提供を目的とする。 In view of the above, the present invention has been made to solve the above-described problems, and it is an object of the present invention to provide a camshaft sintering jig capable of improving productivity as compared with the prior art. .

そこで、本件発明者等は、鋭意研究を行った結果、カムシャフト焼結用治具について、以下に示す構成を採用することで、上述した課題を解決するに到った。 Thus, as a result of intensive studies, the inventors of the present invention have solved the above-described problems by adopting the following configuration for the camshaft sintering jig.

本件発明に係るカムシャフト焼結用治具は、カムロブを含む組付部材が取り付けられたカムシャフトを焼結処理可能な焼結用治具であって、４つの略矩形状枠板によって四角枠状に組まれたカーボン製の枠体と、当該枠体に取り付けられて当該カムシャフトを支持するための、常温下における長手方向の両端面間の長さが２００ｍｍ〜１２００ｍｍのカーボン製の支持部材とからなり、当該支持部材は、当該枠体に取り付けた際の当該支持部材の端面と当該枠体との間の隙間が０．５ｍｍ〜３．５ｍｍであり、且つ、その両端部のカムシャフト載置面側から延出した取付用突出部を備え、当該カムシャフト載置面のカムシャフトの載置位置にカムシャフト保持部材が取り付けられ、常温下では、当該枠体に設けた取付孔に当該支持部材の取付用突出部が遊嵌され、１０００℃〜１２００℃の範囲の焼結温度下では、当該支持部材の長手方向への伸びにより当該支持部材の長手方向の端面が当該枠体の内側面を押圧することで、当該支持部材と当該枠体とが固定されることを特徴とする。 The camshaft sintering jig according to the present invention is a sintering jig capable of sintering a camshaft to which an assembly member including a cam lobe is attached, and is a square frame formed by four substantially rectangular frame plates. carbon steel frame bodies assembled in Jo, attached to the frame for supporting the camshaft, the longitudinal support member length is made of carbon in 200mm~1200mm between both end faces of the room temperature The support member has a gap of 0.5 mm to 3.5 mm between the end surface of the support member and the frame when attached to the frame, and camshafts at both ends thereof includes a mounting protrusion extending from the mounting surface side, the camshaft support member is attached to the mounting position of the camshaft of the camshaft mounting surface, the normal temperature, into the mounting holes provided in the frame Mounting the support member The projecting portion is loosely fitted, and under a sintering temperature in the range of 1000 ° C. to 1200 ° C., the longitudinal end surface of the support member presses the inner side surface of the frame body due to elongation in the longitudinal direction of the support member. Thus, the support member and the frame body are fixed.

また、本件発明に係るカムシャフト焼結用治具において、前記支持部材は、前記カムシャフトが配置される位置にセラミックス材からなるカムシャフト保持部材が取り付けられ、当該カムシャフト保持部材に当該カムシャフトが支持されることが好ましい。 In the camshaft sintering jig according to the present invention, a camshaft holding member made of a ceramic material is attached to the support member at a position where the camshaft is disposed, and the camshaft holding member is attached to the camshaft holding member. Is preferably supported.

また、本件発明に係るカムシャフト焼結用治具において、前記カムシャフト焼結用治具は、並列した２つの前記支持部材にカムシャフトの両端部付近をそれぞれ載置して、当該カムシャフトを支持するものであることが好ましい。 Further, in the camshaft sintering jig according to the present invention, the camshaft sintering jig is mounted on the two support members arranged in parallel in the vicinity of both ends of the camshaft, and the camshaft is mounted. It is preferable to support it.

また、本件発明に係るカムシャフト焼結用治具において、前記枠体は、構成する略矩形状枠板の上端及び下端に段差が形成され、当該枠体を２つ以上積み重ねたときに各枠体同士が当該段差部分で嵌合することが好ましい。 Further, in the camshaft sintering jig according to the present invention, the frame is formed with steps at the upper end and the lower end of the substantially rectangular frame plate, and each frame is stacked when two or more of the frames are stacked. It is preferable that the bodies are fitted at the stepped portion.

また、本件発明に係るカムシャフト焼結用治具において、前記枠体は、前記略矩形状枠板同士がカーボン材からなるねじにより組み付けされることが好ましい。 Moreover, in the camshaft sintering jig according to the present invention, it is preferable that the frame body is assembled by a screw in which the substantially rectangular frame plates are made of a carbon material.

本件発明のカムシャフト焼結用治具は、当該支持部材の両端に備わる枠体に取り付けられる部分の当該枠体の高さ方向における厚みを極力薄くすることが出来るため、複数のカムシャフト焼結用治具を効率よく積み重ねることが出来る。 The camshaft sintering jig of the present invention can reduce the thickness in the height direction of the frame body of the portion attached to the frame body provided at both ends of the support member as much as possible. The jigs can be stacked efficiently.

本件発明に係るカムシャフト焼結用治具にカムシャフトを載置したときの形態を説明するための上面図である。It is a top view for demonstrating a form when a camshaft is mounted in the jig | tool for camshaft sintering which concerns on this invention. （ａ）は図１においてａで示した部分の上面図であり、（ｂ）は図１においてａで示した部分の側面図である。(A) is a top view of the portion indicated by a in FIG. 1, and (b) is a side view of the portion indicated by a in FIG. （ａ）は本件発明に係るカムシャフト焼結用治具の第１枠板の正面図であり、（ｂ）は本件発明に係るカムシャフト焼結用治具の第１枠板の上端側から見た図である。(A) is a front view of the 1st frame board of the jig | tool for camshaft sintering which concerns on this invention, (b) is from the upper end side of the 1st frame board of the jig | tool for camshaft sintering which concerns on this invention. FIG. （ａ）は本件発明に係るカムシャフト焼結用治具の第２枠板の正面図であり、（ｂ）は本件発明に係るカムシャフト焼結用治具の第２枠板の上端側から見た図である。(A) is a front view of the 2nd frame board of the jig | tool for camshaft sintering which concerns on this invention, (b) is from the upper end side of the 2nd frame board of the jig | tool for camshaft sintering which concerns on this invention. FIG. （ａ）は本件発明に係るカムシャフト焼結用治具の支持部材の上面図であり、（ｂ）は本件発明に係るカムシャフト焼結用治具の支持部材の側面図であり、（ｃ）は図５（ａ）の支持部材においてＣ−Ｃ線で切断したときの断面図である。(A) is a top view of the support member of the camshaft sintering jig according to the present invention, (b) is a side view of the support member of the camshaft sintering jig according to the present invention, (c) ) Is a cross-sectional view taken along line CC in the support member of FIG. （ａ）は本件発明に係るカムシャフト焼結用治具のカムシャフト保持部材の正面図であり、（ｂ）は本件発明に係るカムシャフト焼結用治具のカムシャフト保持部材の側面図である。(A) is a front view of the camshaft holding member of the camshaft sintering jig according to the present invention, and (b) is a side view of the camshaft holding member of the camshaft sintering jig according to the present invention. is there. 本件発明に係るカムシャフト焼結用治具を多段に積み重ねたときの形態を説明するための上面図である。It is a top view for demonstrating a form when the jig | tool for camshaft sintering which concerns on this invention is stacked in multiple steps. （ａ）は本件発明に係るカムシャフト焼結用治具を多段に積み重ねたときの形態を図７のＡ方向から見たときの側面図であり、（ｂ）は本件発明に係るカムシャフト焼結用治具を多段に積み重ねたときの形態を図７のＢ方向から見たときの正面図である。(A) is a side view when the camshaft sintering jig according to the present invention is stacked in multiple stages as viewed from the direction A in FIG. 7, and (b) is a camshaft firing according to the present invention. It is a front view when the form when stacking jigs are stacked in multiple stages is viewed from the direction B of FIG.

以下、本件発明のカムシャフト焼結用治具について、図を用いて具体的に説明していく。 Hereinafter, the camshaft sintering jig of the present invention will be specifically described with reference to the drawings.

本件発明に係るカムシャフト焼結用治具：本件発明に係るカムシャフト焼結用治具１は、カムロブ５２を含む組付部材が取り付けられたカムシャフト５０を焼結処理可能な焼結用治具１であって、４つの略矩形状枠板３，３，６，６によって四角枠状に組まれたカーボン製の枠体２と、当該枠体２に取り付けられて当該カムシャフト５０を支持するための、常温下における長手方向の両端面間の長さが２００ｍｍ〜１２００ｍｍのカーボン製の支持部材９とからなるものである。当該支持部材９は、当該枠体２に取り付けた際の当該支持部材９の端面と当該枠体２との間の隙間Ｄが０．５ｍｍ〜３．５ｍｍであり、且つ、その両端部のカムシャフト載置面側から延出した取付用突出部１１を備え、そのカムシャフト載置面のカムシャフト５０の載置位置にカムシャフト保持部材２０が取り付けられる。また、本件発明に係るカムシャフト焼結用治具１は、焼結温度における当該支持部材９の長手方向への熱膨張による長さの伸びが、当該枠体２の同方向への熱膨張による対向する内側面間（図２に示す第１枠板３の内側面３ａと対向する第１枠板３の内側面３ａとの間）の長さの伸びよりも大きくなるよう設定される。そして、本件発明に係るカムシャフト焼結用治具１は、常温下では、当該枠体２（図１における第１枠板３）に設けた支持部材取付孔４に当該支持部材９の取付用突出部１１が遊嵌される。また、１０００℃〜１２００℃の範囲の焼結温度においては、当該支持部材９が熱膨張により長手方向に膨張し、当該枠体２も同方向（図１に示す第２枠板６の長手方向及び第１枠板３の厚さ方向）へ膨張する。このときに、当該支持部材９の長手方向への伸びにより、当該支持部材９の長手方向の端面９ａが当該枠体２の内側面３ａを押圧することで、当該支持部材９と当該枠体２とが固定されることを特徴とするものである。 Camshaft sintering jig according to the present invention: The camshaft sintering jig 1 according to the present invention is a sintering jig capable of sintering a camshaft 50 to which an assembly member including a cam lobe 52 is attached. 1 is a carbon frame 2 assembled in a rectangular frame shape by four substantially rectangular frame plates 3, 3, 6 and 6, and attached to the frame 2 to support the camshaft 50. For this purpose, the support member 9 is made of carbon having a length between both end faces in the longitudinal direction at room temperature of 200 mm to 1200 mm . The support member 9 has a gap D between the end face of the support member 9 and the frame body 2 of 0.5 mm to 3.5 mm when attached to the frame body 2, and cams at both ends thereof The mounting projection 11 extends from the shaft placement surface side, and the camshaft holding member 20 is attached to the placement position of the camshaft 50 on the camshaft placement surface. Further, in the camshaft sintering jig 1 according to the present invention, the length extension due to the thermal expansion in the longitudinal direction of the support member 9 at the sintering temperature is due to the thermal expansion in the same direction of the frame body 2. It is set to be larger than the length extension between the opposing inner side surfaces (between the inner side surface 3a of the first frame plate 3 and the inner side surface 3a of the first frame plate 3 shown in FIG. 2). The camshaft sintering jig 1 according to the present invention is for mounting the support member 9 in the support member mounting hole 4 provided in the frame 2 (first frame plate 3 in FIG. 1) at room temperature. The protrusion 11 is loosely fitted. Further, at a sintering temperature in the range of 1000 ° C. to 1200 ° C., the support member 9 expands in the longitudinal direction due to thermal expansion, and the frame 2 also has the same direction (the longitudinal direction of the second frame plate 6 shown in FIG. 1). And the first frame plate 3 in the thickness direction). At this time, the end surface 9a in the longitudinal direction of the support member 9 presses the inner side surface 3a of the frame body 2 due to the elongation in the longitudinal direction of the support member 9, thereby the support member 9 and the frame body 2. And are fixed.

図１に示すように、本件発明に係るカムシャフト焼結用治具１は、略矩形状の第１枠板３と第２枠板６とによって四角枠状に組まれた枠体２内にカムシャフト５０が所定の間隔で並列して配置される。また、当該支持部材９は、当該カムシャフト５０が載置される位置に図６に例示するような形状のカムシャフト保持部材２０が取り付けられ、このカムシャフト保持部材２０のカムシャフト載置位置２１にカムシャフト５０が支持される。 As shown in FIG. 1, a camshaft sintering jig 1 according to the present invention is placed in a frame 2 assembled in a rectangular frame shape by a substantially rectangular first frame plate 3 and a second frame plate 6. Cam shafts 50 are arranged in parallel at predetermined intervals. Further, the support member 9 has a camshaft holding member 20 having a shape as illustrated in FIG. 6 attached to a position where the camshaft 50 is placed, and a camshaft placement position 21 of the camshaft holding member 20. The camshaft 50 is supported by this.

本件発明に係るカムシャフト焼結用治具１における枠体２は、第１枠板３，３同士と第２枠板６，６同士がそれぞれ面対向して配置され、四角枠状に組まれる。ここで、当該枠体２は、対向する枠板同士が同一形状であることが、コスト面や汎用性の面からみて好ましい。そして、本件発明に係るカムシャフト焼結用治具１における支持部材９は、長尺の部材であり、その両端部が枠体２（図１に示す第１枠板３）に取り付けられる。なお、この支持部材９は、図１において、枠体２内に４つ設けられているが、この数に限定されるものではない。 The frame body 2 in the camshaft sintering jig 1 according to the present invention is formed in a square frame shape by arranging the first frame plates 3 and 3 and the second frame plates 6 and 6 so as to face each other. . Here, as for the said frame 2, it is preferable from the surface of cost or versatility that the frame plates which oppose are the same shape. And the supporting member 9 in the jig | tool 1 for camshaft sintering which concerns on this invention is a elongate member, The both ends are attached to the frame 2 (1st frame board 3 shown in FIG. 1). In FIG. 1, four support members 9 are provided in the frame 2, but the number is not limited to this number.

また、本件発明に係るカムシャフト焼結用治具１における支持部材９は、図２に示すように、その端面９ａに連接し、且つ当該端面９ａのカムシャフト載置面側より延出した取付用突出部１１が備えられる。当該支持部材９は、図５に示す取付用突出部１１の幅Ｘが図３に示す支持部材取付孔４の幅Ｌよりも小さく、且つ、図５に示す取付用突出部１１の厚さＹが図３に示す支持部材取付孔４の高さＨよりも小さくなるように形状が形成されることに加え、常温下において端面９ａが当該枠体２の内側面（図２に示す第１枠体３の内側面３ａ）と接触しないような形状に形成される。従って、本件発明に係るカムシャフト焼結用治具１は、常温下において、各支持部材９の脱着を容易に行うことが出来るため、メンテナンス性の向上を図ることが出来る。 Further, as shown in FIG. 2, the support member 9 in the camshaft sintering jig 1 according to the present invention is connected to the end surface 9a and extends from the camshaft mounting surface side of the end surface 9a. A projecting portion 11 is provided. 5, the width X of the mounting projection 11 shown in FIG. 5 is smaller than the width L of the support member mounting hole 4 shown in FIG. 3, and the thickness Y of the mounting projection 11 shown in FIG. Is formed to be smaller than the height H of the support member mounting hole 4 shown in FIG. 3, and the end surface 9a is the inner side surface of the frame body 2 (the first frame shown in FIG. 2) at room temperature. It is formed in a shape that does not come into contact with the inner surface 3a) of the body 3. Therefore, since the camshaft sintering jig 1 according to the present invention can easily attach and detach each support member 9 at room temperature, it is possible to improve maintainability.

また、本件発明に係るカムシャフト焼結用治具１は、１０００℃〜１２００℃の範囲の焼結温度下では、当該支持部材９の長手方向への伸びにより当該支持部材９の端面９ａが当該枠体２の内側面（図２に示す第１枠板３の内側面３ａ）を押圧することで、当該支持部材９と当該枠体２とがしっかり固定されるものである。従って、本件発明に係るカムシャフト焼結用治具１によれば、支持部材９の取付用突出部１１にかかる重力方向の負荷が低減され、従来よりも枠体２の高さ方向の厚さＹを極力薄くすることが可能となる。よって、本件発明に係るカムシャフト焼結用治具１によれば、燒結処理中における支持部材９の変形を防止することが出来、また、カムシャフト５０の載置位置を枠体２の高さ方向でみて従来よりも低くすることが出来る。すなわち、本件発明に係るカムシャフト焼結用治具１によれば、従来よりも多くカムシャフト焼結用治具を積み重ねることが出来、従来よりも生産性の向上を図ることが可能となる。 In addition, the camshaft sintering jig 1 according to the present invention is such that the end surface 9a of the support member 9 is caused to extend in the longitudinal direction of the support member 9 at a sintering temperature in the range of 1000 ° C to 1200 ° C. The support member 9 and the frame body 2 are firmly fixed by pressing the inner surface of the frame body 2 (the inner surface 3a of the first frame plate 3 shown in FIG. 2). Therefore, according to the camshaft sintering jig 1 according to the present invention, the load in the gravitational direction applied to the mounting protrusion 11 of the support member 9 is reduced, and the thickness of the frame body 2 in the height direction is larger than the conventional thickness. It becomes possible to make Y as thin as possible. Therefore, according to the camshaft sintering jig 1 according to the present invention, the support member 9 can be prevented from being deformed during the sintering process, and the mounting position of the camshaft 50 can be set to the height of the frame 2. It can be made lower than in the past in terms of direction. That is, according to the camshaft sintering jig 1 according to the present invention, it is possible to stack more camshaft sintering jigs than in the past, and it is possible to improve productivity compared to the conventional art.

ちなみに、本件発明に係るカムシャフト焼結用治具１は、当該支持部材９（カムシャフト保持部材２０を含む。）上にカムシャフト５０が載置されたときに、当該枠体２の上端が当該カムシャフト５０の最上端よりも若干高く、且つ当該枠体２の下端が当該支持部材９の最下端よりも若干低く形成されることが好ましい。以下に、本件発明に係るカムシャフト焼結用治具１の各構成部材について簡単に説明しておく。 Incidentally, the camshaft sintering jig 1 according to the present invention has an upper end of the frame 2 when the camshaft 50 is placed on the support member 9 (including the camshaft holding member 20). It is preferable that the camshaft 50 is slightly higher than the uppermost end and the lower end of the frame 2 is formed slightly lower than the lowermost end of the support member 9. Below, each component of the jig 1 for camshaft sintering which concerns on this invention is demonstrated easily.

本件発明に係るカムシャフト焼結用治具１の枠体２を構成する第１枠板３は、図３（ａ）に示すように、その下端面近傍において、当該第１枠板３の長手方向に沿って延びるスリット状の４つの支持部材取付孔４が貫通孔として形成されている。また、これらの４つの支持部材取付孔４の全てが、第１枠板３の一方の端面側から他方の端面側に向かって、同じ高さに設けられている。ここで、当該第１枠板３に形成する支持部材取付孔４は、強度上問題の生じない極力下端面近くに設定することで、枠体２の高さを更に低く設定することが可能となり、カムシャフト焼結用治具１をより多く積み重ねることが出来るため、生産効率上好ましい。そして、当該第１枠板３の両端面には、図３（ｂ）に示すように、ねじ穴５が形成され、第２枠板６とねじにより締結される。 As shown in FIG. 3A, the first frame plate 3 constituting the frame 2 of the camshaft sintering jig 1 according to the present invention has a longitudinal length of the first frame plate 3 in the vicinity of the lower end surface thereof. Four support member mounting holes 4 in the form of slits extending along the direction are formed as through holes. All of these four support member mounting holes 4 are provided at the same height from one end surface side of the first frame plate 3 toward the other end surface side. Here, the support member mounting hole 4 formed in the first frame plate 3 is set as close to the lower end surface as possible so as not to cause a problem in strength, so that the height of the frame body 2 can be set further lower. Since more camshaft sintering jigs 1 can be stacked, it is preferable in terms of production efficiency. And the screw hole 5 is formed in the both end surfaces of the said 1st frame board 3 as shown in FIG.3 (b), and it fastens with the 2nd frame board 6 with a screw | thread.

また、本件発明に係るカムシャフト焼結用治具１の枠体２を構成する第２枠板６は、図４（ａ）に示すように、当該第２枠板６を厚さ方向に貫通すると共に長手方向にスリット状に延びる３つの貫通孔７が形成されている。この貫通孔７は、第２枠板６の長手方向の略中央部から両端部近傍まで形成されることで、枠体２の軽量化を図ることが出来、また、枠体２内におけるカムシャフト５０の載置状態等が目視により確認することが出来る。また、図４（ａ）及び図４（ｂ）に示すように、第２枠板６には、第１枠板３のねじ穴５に対応する位置に締結用孔８が設けられており、第１枠板３と第２枠板６とがねじ等の締結部材により締結される。なお、当該第２枠板６における貫通孔７の数や寸法等は、図４に示す数や寸法等に限定されるものではなく、仕様態様に応じて適宜設計可能である。 The second frame plate 6 constituting the frame body 2 of the camshaft sintering jig 1 according to the present invention penetrates the second frame plate 6 in the thickness direction as shown in FIG. In addition, three through holes 7 extending in a slit shape in the longitudinal direction are formed. The through-hole 7 is formed from the substantially central portion in the longitudinal direction of the second frame plate 6 to the vicinity of both end portions, so that the weight of the frame body 2 can be reduced, and the camshaft in the frame body 2 can be achieved. 50 mounting conditions and the like can be visually confirmed. 4A and 4B, the second frame plate 6 is provided with fastening holes 8 at positions corresponding to the screw holes 5 of the first frame plate 3, The first frame plate 3 and the second frame plate 6 are fastened by a fastening member such as a screw. In addition, the number, dimension, etc. of the through-hole 7 in the said 2nd frame board 6 are not limited to the number, dimension, etc. which are shown in FIG. 4, It can design suitably according to a specification aspect.

また、本件発明に係るカムシャフト焼結用治具１における支持部材９は、その両端部が、図５（ｂ）に示すように、その両端部のカムシャフト載置面側から延出した取付部１１を備えた構造となっている。当該支持部材９の当該取付用突出部１１は、図２に示すように、第１枠板３に形成された支持部材取付孔４に挿入され、対向する２つの第１枠板３，３のそれぞれに取り付けられる。ここで、当該支持部材９の取付用突出部１１の突出長さは、当該第１枠板３の厚さと同一寸法又は若干小さい寸法で形成されていることが好ましい。また、図５（ａ）及び図５（ｂ）に示すように、当該支持部材９のカムシャフト載置面には、図６に例示するような形状のカムシャフト保持部材２０が取り付けられるカムシャフト保持部材取付用溝１０が、当該支持部材９の長手方向に沿ってスリット状に延びて形成される。なお、当該カムシャフト保持部材取付用溝１０は、当該カムシャフト保持部材２０を取り付けることができる長さを有するものであれば良く、図５に示す長さに限定されるものではない。例えば、当該保持部材取付用溝１０は、当該支持部材９の長手方向の一方の端面の近傍から他方の端面の近傍まで延びた形状のものであっても良い。また、図５（ｃ）には、図５（ａ）の支持部材９においてＣ−Ｃ線で切断したときの断面図が略台形形状により示されているが、本件発明の支持部材９の断面形状はこれに限定されるものではない。 Further, the support member 9 in the camshaft sintering jig 1 according to the present invention has both ends extended from the camshaft mounting surface side of both ends as shown in FIG. 5B. The structure is provided with a portion 11. As shown in FIG. 2, the mounting protrusion 11 of the support member 9 is inserted into the support member mounting hole 4 formed in the first frame plate 3, and the two first frame plates 3, 3 facing each other. Attached to each. Here, the protruding length of the mounting protrusion 11 of the support member 9 is preferably formed to have the same dimension as the thickness of the first frame plate 3 or a slightly smaller dimension. Further, as shown in FIGS. 5A and 5B, a camshaft in which a camshaft holding member 20 having a shape illustrated in FIG. 6 is attached to the camshaft mounting surface of the support member 9. The holding member mounting groove 10 is formed to extend in a slit shape along the longitudinal direction of the support member 9. The camshaft holding member mounting groove 10 is not limited to the length shown in FIG. 5 as long as it has a length to which the camshaft holding member 20 can be mounted. For example, the holding member mounting groove 10 may have a shape extending from the vicinity of one end face in the longitudinal direction of the support member 9 to the vicinity of the other end face. FIG. 5 (c) shows a cross-sectional view of the support member 9 of FIG. 5 (a) taken along the line C-C with a substantially trapezoidal shape, but the cross-section of the support member 9 of the present invention. The shape is not limited to this.

ここで、本件発明に係るカムシャフト焼結用治具１を用いて焼結処理される焼結製カムシャフトについても簡単に述べておく。焼結製カムシャフト５０は、主に内燃機関で使用されるものであり、シャフト５１と、そのシャフト５１に組み付けられたカムロブ５２等の組付部材とが拡散結合して一体化されたものである。ちなみに、焼結製カムシャフト５０にはカムロブ５２の他、ジャーナルピースやエンドピース等の組付部材が取り付けられ、本件発明に係るカムシャフト焼結用治具１は、そのような構成のものに適宜対応することが出来る。 Here, a sintered camshaft that is sintered using the camshaft sintering jig 1 according to the present invention will be briefly described. The sintered camshaft 50 is mainly used in an internal combustion engine, and is formed by diffusion coupling and integrating a shaft 51 and an assembly member such as a cam lobe 52 assembled to the shaft 51. is there. Incidentally, an assembly member such as a journal piece and an end piece is attached to the sintered camshaft 50 in addition to the cam lobe 52, and the camshaft sintering jig 1 according to the present invention has such a configuration. Appropriate measures can be taken.

燒結製のカムロブ５２は、焼結用合金粉末等の金属粉末を圧粉成形して所定の寸法の圧粉成形体に形成される。また、シャフト５１は、冷間引き抜き加工等によって所定の寸法に加工される。ちなみに、このシャフト５１の材料としては、ＪＩＳ記号でＳＴＫＭ鋼材又はＳ−Ｃ鋼材として表される機械構造用炭素鋼の鋼管又は鋼材等が挙げられる。 The sintered cam lobe 52 is formed into a compacted body having a predetermined size by compacting a metal powder such as an alloy powder for sintering. The shaft 51 is processed into a predetermined dimension by cold drawing or the like. Incidentally, examples of the material of the shaft 51 include steel pipes or steel materials of carbon steel for mechanical structure represented as STKM steel materials or SC steel materials by JIS symbols.

また、本件発明に係るカムシャフト焼結用治具１において、枠体２及び支持部材９は、カーボン材からなり、常温下において、長手方向の両端面間の長さが２００ｍｍ〜１２００ｍｍの支持部材９を当該枠体２に取り付けた際の当該支持部材９の端面と当該枠体２との間の隙間Ｄが０．５ｍｍ〜３．５ｍｍである。 Further, in the camshaft sintering jig 1 according to the present invention, the frame 2 and the support member 9 are made of a carbon material, and the length between both end faces in the longitudinal direction is 200 mm to 1200 mm at room temperature. 9 Ru gap D is 0.5mm~3.5mm der between the end face and the frame body 2 of the support member 9 when attached to the frame 2.

本件発明に係るカムシャフト焼結用治具１の枠体２（第１枠板３、第２枠板６）及び支持部材９は、カーボン材からなり、例えば、炭素の元素のみからなり一定の結晶構造を有する黒鉛（グラファイト）や、一定の結晶構造を有しない炭素繊維（カーボンファイバー）等により形成することが出来る。中でも、当該枠体２（第１枠板３、第２枠板６）及び当該支持部材９は、等方性黒鉛材や炭素繊維強化炭素複合材により形成されることが好ましい。ここで、等方性黒鉛材は、ピッチコークス微粉からなるフィラー原料にバインダーピッチを配合し、加熱しながら混練し、混練物を粉砕した原料粉を冷間静水圧プレス（ＣＩＰ：ＣｏｌｄＩｓｏｓｔａｔｉｃＰｒｅｓｓ）等により等方的に成型し、得られた成型体を焼成炭化したのち黒鉛化処理をすることにより得られるものである。従って、等方性黒鉛材は、全ての面において強度のばらつきが少なく、機械的性質に優れたものである。また、炭素繊維強化炭素複合材（Ｃ／Ｃ材）は、母材に炭素を用い、強化材として炭素繊維を用いた炭素のみで構成される複合材料である。炭素繊維強化炭素複合材は、軽量でありながら高い熱衝撃抵抗、高温強度を備え、機械的性質にも優れたものである。 The frame body 2 (the first frame plate 3 and the second frame plate 6) and the support member 9 of the camshaft sintering jig 1 according to the present invention are made of a carbon material. It can be formed of graphite having a crystal structure (graphite), carbon fiber having no fixed crystal structure (carbon fiber), or the like. Especially, it is preferable that the said frame 2 (1st frame board 3, 2nd frame board 6) and the said supporting member 9 are formed with an isotropic graphite material or a carbon fiber reinforced carbon composite material. Here, the isotropic graphite material is a cold isostatic press (CIP: Cold Isostatic Press) of a raw material powder obtained by blending a binder pitch into a filler raw material composed of fine pitch coke powder, kneading while heating, and pulverizing the kneaded product. It is obtained by, for example, isotropically molding with, for example, and calcining the obtained molded body, followed by graphitization. Accordingly, the isotropic graphite material has little variation in strength on all sides and is excellent in mechanical properties. The carbon fiber reinforced carbon composite material (C / C material) is a composite material composed of only carbon using carbon as a base material and carbon fiber as a reinforcing material. The carbon fiber reinforced carbon composite material is lightweight and has high thermal shock resistance, high temperature strength, and excellent mechanical properties.

本件発明に係るカムシャフト焼結用治具１は、１０００℃〜１２００℃の範囲の焼結温度下において、支持部材９の長手方向への伸びにより当該支持部材９の端面９ａが枠体２の内側面３ａを押圧し、当該支持部材９と当該枠体２とがしっかり固定されることとなる。なお、この場合、常温下における長手方向の両端面９ａ間の長さが２００ｍｍ〜１２００ｍｍの支持部材９を当該枠体２に取り付けた際の、当該支持部材９の端面９ａと当該枠体２との間の隙間Ｄを０．５ｍｍ〜３．５ｍｍの範囲に設定することで、１０００℃〜１２００℃の範囲の焼結温度下において、当該枠体２は、当該支持部材９により損傷するほどの大きな力で押圧されることがない。よって、本件発明に係るカムシャフト焼結用治具１の枠体２を構成する第１枠板３及び第２枠板６の厚さに関しては、特に限定されないものの、１０００℃〜１２００℃の範囲の焼結温度下において変形しない寸法で形成されていれば問題が生じない。 In the camshaft sintering jig 1 according to the present invention, the end surface 9a of the support member 9 has the frame body 2 due to elongation in the longitudinal direction of the support member 9 at a sintering temperature in the range of 1000 ° C to 1200 ° C. The inner surface 3a is pressed, and the support member 9 and the frame body 2 are firmly fixed. In this case, the end surface 9a of the support member 9 and the frame body 2 when the support member 9 having a length between the both end surfaces 9a in the longitudinal direction of 200 mm to 1200 mm is attached to the frame body 2 at room temperature. Is set to the range of 0.5 mm to 3.5 mm, so that the frame body 2 is damaged by the support member 9 under the sintering temperature of 1000 ° C. to 1200 ° C. It is not pressed with great force. Therefore, although it does not specifically limit regarding the thickness of the 1st frame board 3 and the 2nd frame board 6 which comprise the frame 2 of the jig | tool 1 for camshaft sintering which concerns on this invention, The range of 1000 to 1200 degreeC is not limited. No problem arises if it is formed with dimensions that do not deform under the sintering temperature.

また、本件発明に係るカムシャフト焼結用治具１において、支持部材９は、カムシャフト５０が配置される位置にセラミックス材からなるカムシャフト保持部材２０が取り付けられ、当該カムシャフト保持部材２０に当該カムシャフト５０が支持されることが好ましい。 In the camshaft sintering jig 1 according to the present invention, the support member 9 is provided with a camshaft holding member 20 made of a ceramic material at a position where the camshaft 50 is disposed. The camshaft 50 is preferably supported.

図５に示すように、支持部材９の上面には、カムシャフト保持部材取付用溝１０が形成されている。このカムシャフト保持部材取付溝１０には、図６に例示するセラミックス材からなるカムシャフト保持部材２０が嵌め込まれて取り付けられる。本件発明のカムシャフト焼結用治具１は、セラミックス材からなるカムシャフト保持部材２０の上にカムシャフト５０を配置する構造とすることで、カーボン材からなる枠体２に鋼製のシャフトが直接接触して浸炭されることがない。ここで、セラミックス材は、炭化珪素セラミックス、窒化珪素セラミックス、アルミナセラミックス等多くの種類が存在し、その種類によって用途が異なるが、共通して高い硬度と優れた耐熱性を有している。本件発明のカムシャフト保持部材２０は、使用環境に応じて適当な材質を選択可能である。なお、当該カムシャフト保持部材取付用溝１０の当該支持部材９の長手方向に対して垂直方向の幅は、カムシャフト保持部材２０の厚さ（図６（ｂ）参照のこと。）より若干大きい寸法で形成されていることで、脱落等の不具合が生じ難くなり好ましい。 As shown in FIG. 5, a camshaft holding member mounting groove 10 is formed on the upper surface of the support member 9. A camshaft holding member 20 made of a ceramic material illustrated in FIG. 6 is fitted and attached to the camshaft holding member mounting groove 10. The camshaft sintering jig 1 of the present invention has a structure in which a camshaft 50 is disposed on a camshaft holding member 20 made of a ceramic material, so that a steel shaft is attached to the frame 2 made of carbon material. It is not carburized by direct contact. Here, there are many types of ceramic materials such as silicon carbide ceramics, silicon nitride ceramics, alumina ceramics, and the use varies depending on the types, but they have high hardness and excellent heat resistance in common. For the camshaft holding member 20 of the present invention, an appropriate material can be selected according to the use environment. The width of the camshaft holding member mounting groove 10 in the direction perpendicular to the longitudinal direction of the support member 9 is slightly larger than the thickness of the camshaft holding member 20 (see FIG. 6B). It is preferable that it is formed with dimensions so that problems such as dropout are less likely to occur.

また、本件発明のカムシャフト保持部材２０は、カムシャフト５０が載置される部材であるため、図６に示すように、略矩形状からなる部材の上面を円弧状に窪ませた形状に形成されていることが好ましく、その窪ませた部分がカムシャフト１０が載置されるカムシャフトの載置位置２１となる。このカムシャフトの載置位置２１の窪ませた部分における円弧状の径は、載置されるカムシャフト５０の径よりも大きな径となるように形成されていることが、当該カムシャフト５０を安定して支持する上で好ましい。なお、当該カムシャフトの載置位置２１の形状は、図６（ａ）に示すような円弧状に限定されるものではなく、略Ｖ字状等であっても良い。また、図６（ｂ）に示す当該カムシャフト保持部材２０の厚さは、カムシャフト５０が載置された状態で１０００℃〜１２００℃の範囲の焼結温度下においても変形しない寸法で形成されていれば特に問題の生じることがない。また、当該カムシャフト保持部材２０の高さは、当該カムシャフト保持部材２０の上にカムシャフト５０を載置したときに、シャフト５１やカムロブ５２等が支持部材９に接触しない寸法で形成されていることが好ましい。 In addition, since the camshaft holding member 20 of the present invention is a member on which the camshaft 50 is placed, as shown in FIG. 6, the upper surface of the substantially rectangular member is formed in a shape that is recessed in an arc shape. It is preferable that the recessed portion is a mounting position 21 of the camshaft on which the camshaft 10 is mounted. In order to stabilize the camshaft 50, the arcuate diameter in the recessed portion of the camshaft placement position 21 is formed to be larger than the diameter of the camshaft 50 to be placed. Therefore, it is preferable for supporting. In addition, the shape of the mounting position 21 of the camshaft is not limited to the arc shape as shown in FIG. 6A, and may be substantially V-shaped. Further, the thickness of the camshaft holding member 20 shown in FIG. 6B is formed with a dimension that does not deform even under a sintering temperature in the range of 1000 ° C. to 1200 ° C. with the camshaft 50 mounted. If so, there will be no problem. Further, the height of the camshaft holding member 20 is formed such that the shaft 51 and the cam lobe 52 do not contact the support member 9 when the camshaft 50 is placed on the camshaft holding member 20. Preferably it is.

また、本件発明に係るカムシャフト焼結用治具１は、並列した２つの支持部材９にカムシャフト５０の両端部付近をそれぞれ載置して、当該カムシャフト５０を支持するものであることが好ましい。 In addition, the camshaft sintering jig 1 according to the present invention is configured to support the camshaft 50 by placing the vicinity of both ends of the camshaft 50 on two support members 9 arranged in parallel. preferable.

図１には、カムシャフト５０が、カムシャフト焼結用治具１の枠体２を構成する第２枠板６の長手方向と平行に配置された２つの支持部材９上に載置されているのが示されている。本件発明に係るカムシャフト焼結用治具１によれば、２つの支持部材９により常に安定した状態でカムシャフト５０を支持することが出来、高品質の燒結製カムシャフトを得ることが出来る。 In FIG. 1, the camshaft 50 is placed on two support members 9 arranged in parallel with the longitudinal direction of the second frame plate 6 constituting the frame 2 of the camshaft sintering jig 1. Is shown. According to the camshaft sintering jig 1 according to the present invention, the camshaft 50 can be supported in a stable state by the two support members 9 at all times, and a high-quality sintered camshaft can be obtained.

また、本件発明に係るカムシャフト焼結用治具１において、枠体２は、構成する略矩形状枠板３、６の上端及び下端に段差が形成され、当該枠体２を２つ以上積み重ねたときに各枠体同士が当該段差部分で嵌合することが好ましい。 Further, in the camshaft sintering jig 1 according to the present invention, the frame 2 is formed with steps at the upper and lower ends of the substantially rectangular frame plates 3 and 6 constituting the frame 2, and two or more frames 2 are stacked. It is preferable that the frames are fitted to each other at the step portion.

本件発明に係るカムシャフト焼結用治具１は、枠体２の上端面及び下端面に段差が形成されているため、図７及び図８に示すように、カムシャフト焼結用治具１を多段に重ねたときに、下段側の第１枠板３の上端に形成される凹状の段差３ａと上段側の第１枠板３の下端に形成される凸状の段差３ｂとが互いに嵌合し、且つ、下段側の第２枠板６の上端に形成される凸状の段差６ａと上段側の第２枠板６の下端に形成される凹状の段差６ｂとが互いに嵌合する。その結果、カムシャフト焼結用治具１を多段に重ねた場合において、下段に位置する枠体２と上段に位置する枠体２との間に位置ずれの生じることがない。本件発明のカムシャフト焼結用治具１は、従来のトレー構造のものとは異なり、基本的には枠体２のみからなる構造骨格で構成されている。そのため、図７及び図８に示すように、カムシャフト焼結用治具１を効率よく積み重ねたり並列させたりすることが可能となる。また、図７及び図８に示すように、本件発明に係るカムシャフト焼結用治具１の下には、平板状のベース板５０を設けるが、この場合、ロボット等を用いて当該カムシャフト焼結用治具１を損傷させずに移動させることが出来る。 Since the camshaft sintering jig 1 according to the present invention has steps formed on the upper end surface and the lower end surface of the frame 2, as shown in FIGS. 7 and 8, the camshaft sintering jig 1 Are stacked in multiple stages, the concave step 3a formed at the upper end of the lower first frame plate 3 and the convex step 3b formed at the lower end of the upper first frame plate 3 are fitted together. In addition, the convex step 6a formed at the upper end of the second frame plate 6 on the lower stage side and the concave step 6b formed at the lower end of the second frame plate 6 on the upper stage side are fitted together. As a result, when the camshaft sintering jigs 1 are stacked in multiple stages, there is no displacement between the lower frame body 2 and the upper frame body 2. Unlike the conventional tray structure, the camshaft sintering jig 1 of the present invention is basically composed of a structural skeleton consisting only of the frame 2. Therefore, as shown in FIGS. 7 and 8, the camshaft sintering jigs 1 can be efficiently stacked or juxtaposed. As shown in FIGS. 7 and 8, a flat base plate 50 is provided under the camshaft sintering jig 1 according to the present invention. In this case, the camshaft is used by using a robot or the like. The sintering jig 1 can be moved without being damaged.

また、本件発明に係るカムシャフト焼結用治具１において、枠体２は、略矩形状枠板同士３、６がカーボン材からなるねじ３０により組み付けされることが好ましい。 In the camshaft sintering jig 1 according to the present invention, the frame body 2 is preferably assembled by screws 30 having substantially rectangular frame plates 3 and 6 made of a carbon material.

本件発明に係るカムシャフト焼結用治具１においては、枠体２を構成する第１枠板３と第２枠板６との固定するに際し、図１に示すように、ねじ３０を用いることで、その組み立て及び分解を容易にし、メンテナンス性に優れたものとなる。なお、本件発明の枠体２を構成する第１枠板３と第２枠板６とを固定する際に用いるねじ３０は、カーボン材からなることで、１０００℃〜１２００℃の範囲の焼結温度下においても変形することがない。 In the camshaft sintering jig 1 according to the present invention, when fixing the first frame plate 3 and the second frame plate 6 constituting the frame body 2, screws 30 are used as shown in FIG. 1. Thus, the assembly and disassembly are facilitated, and the maintenance is excellent. In addition, the screw 30 used when fixing the 1st frame board 3 and the 2nd frame board 6 which comprise the frame 2 of this invention consists of carbon materials, and is sintered in 1000 to 1200 degreeC. There is no deformation even under temperature.

以上に説明したように、本件発明に係るカムシャフト焼結用治具１によれば、従来よりも効率よく焼結製カムシャフトを生産することが可能となる。例えば、従来のカムシャフト焼結用治具では焼結炉内に３列６段までしか配置出来なかったところ、本件発明のカムシャフト焼結用治具１を用いた場合には、３列８段まで配置することが可能となる。ここで、全長４５０ｍｍのカムシャフト５０を焼結処理するとした場合、従来のカムシャフト焼結用治具を用いたときの処理量を１００とすると、本件発明のカムシャフト焼結用治具１を用いたときの処理量は１５０となり、従来のものに比べて５０％処理量を向上させることが可能となる。 As described above, according to the camshaft sintering jig 1 according to the present invention, a sintered camshaft can be produced more efficiently than before. For example, in the conventional camshaft sintering jig, only up to 3 rows and 6 stages could be arranged in the sintering furnace, but when the camshaft sintering jig 1 of the present invention is used, 3 rows 8 It is possible to arrange up to a stage. Here, when the camshaft 50 having a total length of 450 mm is subjected to a sintering process, when the processing amount when using a conventional camshaft sintering jig is 100, the camshaft sintering jig 1 of the present invention is When used, the processing amount is 150, and the processing amount can be improved by 50% compared to the conventional one.

本件発明に係るカムシャフト焼結用治具によれば、従来よりも効率よく焼結製カムシャフトを生産することが可能となるため、焼結コストの低減化を図ることが出来る。従って、本件発明に係るカムシャフト焼結用治具を採用することで、低価格で、高品質の焼結製カムシャフトを市場に提供することが可能となる。 According to the camshaft sintering jig according to the present invention, it becomes possible to produce a sintered camshaft more efficiently than before, so that the sintering cost can be reduced. Therefore, by using the camshaft sintering jig according to the present invention, it is possible to provide a high-quality sintered camshaft to the market at a low price.

１カムシャフト焼結用治具
２枠体
３第１枠板
３ａ第１枠板の内側面
４支持部材取付孔
５ねじ穴
６第２枠板
７貫通孔
８締結用孔
９支持部材
９ａ端面
１０カムシャフト保持部材取付用溝
１１取付用突出部
２０カムシャフト保持部材
２１カムシャフトの載置位置
３０ねじ部材
４０ベース板
５０カムシャフト
５１シャフト
５２カムロブ
Ｄ隙間 DESCRIPTION OF SYMBOLS 1 Camshaft sintering jig | tool 2 Frame 3 1st frame board 3a Inner side surface of 1st frame board 4 Support member attachment hole 5 Screw hole 6 2nd frame board 7 Through-hole 8 Fastening hole 9 Support member 9a End surface 10 Camshaft holding member mounting groove 11 Mounting protrusion 20 Camshaft holding member 21 Position of camshaft 30 Screw member 40 Base plate 50 Camshaft 51 Shaft 52 Cam lobe D Gap

Claims

A sintering jig capable of sintering a camshaft to which an assembly member including a cam lobe is attached,
A carbon frame assembled into a quadrangular frame by four substantially rectangular frame plates, and a length between both end surfaces in the longitudinal direction at room temperature to be attached to the frame and support the camshaft Consists of a 200 mm to 1200 mm carbon support member,
The support member has a gap between the end surface of the support member and the frame body of 0.5 mm to 3.5 mm when attached to the frame body, and the camshaft mounting surface side at both ends thereof Provided with a mounting projection extending from the camshaft mounting surface, the camshaft holding member is mounted on the camshaft mounting position of the camshaft mounting surface,
Under normal temperature, the mounting protrusion of the support member is loosely fitted into the mounting hole provided in the frame,
Under the sintering temperature in the range of 1000 ° C. to 1200 ° C., the end surface in the longitudinal direction of the support member presses the inner side surface of the frame body due to the elongation in the longitudinal direction of the support member. A camshaft sintering jig, wherein a frame is fixed.

The support member, the cam shaft is a cam shaft holding member made of ceramic material attached to a position to be disposed, camshaft sintering according to claim 1 in which the camshaft is supported on the cam shaft holding member jig.

The camshaft sintering jig is placed near both ends of the cam shaft to the two of the support member in parallel, according to claim 1 or claim 2 in which for supporting the camshaft Camshaft sintering jig.

The said frame is formed in level | step differences in the upper end and lower end of the substantially rectangular frame board which comprises, Each frame fits in the said level | step-difference part when two or more of the said frame bodies are stacked | stacked. Item 4. The camshaft sintering jig according to any one of Items 3 to 4 .

The camshaft sintering jig according to any one of claims 1 to 4 , wherein the substantially rectangular frame plates are assembled with a screw made of a carbon material.