JPH1142513A - Press-in join method of aluminum-made outer and iron-made inner - Google Patents
Press-in join method of aluminum-made outer and iron-made innerInfo
- Publication number
- JPH1142513A JPH1142513A JP21574097A JP21574097A JPH1142513A JP H1142513 A JPH1142513 A JP H1142513A JP 21574097 A JP21574097 A JP 21574097A JP 21574097 A JP21574097 A JP 21574097A JP H1142513 A JPH1142513 A JP H1142513A
- Authority
- JP
- Japan
- Prior art keywords
- press
- fitting
- iron
- aluminum
- inner hole
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、アルミニウム合金
製のハウジングに鉄製のインナ部材を強固に圧入接合す
る方法に関するものであり、内燃機関の吸気または排気
用の弁座部等の部材の接合に利用することができる。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of firmly press-fitting an inner member made of iron to a housing made of an aluminum alloy, and more particularly to a method of joining a member such as a valve seat for intake or exhaust of an internal combustion engine. Can be used.
【0002】[0002]
【従来の技術】アルミニウム合金製部材の孔に鉄製部材
を圧入により接合した構造物としては内燃機関の弁座が
ある。これは円筒面における接合であり、圧入は孔部材
(アウタ)と軸部材(インナ)の寸法関係を締まりばめ
の状態として、常温、焼きばめまたは冷やしばめにより
行う。2. Description of the Related Art A valve seat of an internal combustion engine is known as a structure in which an iron member is press-fitted into a hole of an aluminum alloy member. This is a joining on a cylindrical surface, and press-fitting is performed at room temperature, shrink fit or cold fit with the dimensional relationship between the hole member (outer) and the shaft member (inner) being a tight fit.
【0003】[0003]
【発明が解決しようとする課題】圧入で接合をより強く
するためには、締まりばめの圧入量を多くするか、接合
面の面積を大きくすればよいが、前者では特に軟質材か
らなるアウタに掛かる応力が大きくなり、変形を生じた
り、割れ等の欠陥を生じる懸念が増大する。後者におい
ては、両部材の直径や長さが大きくなり、装置を大きく
したり、蓄熱量が増大する等の不都合が生じることにな
る。そこで、この発明は上述の事情を背景に、より小さ
く薄い部材を用いて、従来と同等以上の接合力を容易に
生じさせる方法を提供することを課題とする。In order to strengthen the joint by press-fitting, it is necessary to increase the press-fitting amount of the interference fit or to increase the area of the joint surface. Is increased, and there is an increased concern that deformation or cracks or other defects may occur. In the latter case, the diameters and lengths of the two members are increased, resulting in inconveniences such as an increase in the size of the device and an increase in the amount of heat storage. In view of the above circumstances, an object of the present invention is to provide a method for easily generating a bonding force equal to or higher than that of the related art by using smaller and thinner members.
【0004】[0004]
【課題を解決するための手段】上記課題を解決するた
め、この発明の接合方法は、鉄製インナの接合面となる
外周面に、軸心に対して平行あるいは傾斜角30゜以下
で、高さが7〜200μmであり、かつ圧入方向に連続
または断続した複数の凸条を設けるとともに、外周面を
圧入前方側に下底を有する円錐台状に形成し、アルミニ
ウム製アウタの内孔の前記インナの圧入前方側に、イン
ナの端面と当接する段差部を設けるとともに、段差部側
の内孔径を入口側の内孔径より大きく形成し、前記アウ
タの内孔に前記インナを凸条の稜線に沿って締まりばめ
により圧入することを特徴とする。前記「傾斜角」と
は、軸心を通る平面と外周面とが交わる線と前記凸条が
なす角度をいう。In order to solve the above-mentioned problems, a joining method according to the present invention is arranged such that an outer peripheral surface serving as a joining surface of an iron inner is parallel to an axis or has an inclination angle of 30 ° or less and a height of 30 ° or less. And a plurality of ridges continuous or intermittent in the press-fitting direction, and the outer peripheral surface is formed in a truncated conical shape having a lower bottom on the press-fitting front side, and the inner hole of the inner hole of the aluminum outer is provided. On the press-fitting front side, a stepped portion is provided which is in contact with the end face of the inner, and the inner hole diameter on the stepped portion is formed larger than the inner hole diameter on the inlet side, and the inner is formed along the ridgeline of the ridge on the inner hole of the outer. It is characterized by press-fitting with interference fit. The “tilt angle” refers to an angle formed by a line intersecting a plane passing through the axis and the outer peripheral surface and the ridge.
【0005】アルミニウム製アウタの内孔は、インナの
圧入前方側に下底を有する円錐台状、または軸心と平行
な筒状であって、段差部側に大径部を有しており、イン
ナまたはアウタの円錐台形状の下底と上底の凸条以外の
部分の直径の差が10〜40μmであることを特徴とす
る。[0005] The inner hole of the aluminum outer has a truncated cone shape having a lower bottom on the front side of the inner press fit, or a cylindrical shape parallel to the axis, and has a large diameter portion on the step side. The inner or outer truncated cone is characterized in that the difference in diameter between the lower and upper portions of the bottom other than the ridge is 10 to 40 μm.
【0006】これらの方法は、圧入を所定位置まで衝撃
力下に行うこと、アルミニウム製アウタの内孔近傍およ
び鉄製インナの少なくとも一方を温度400〜600℃
に加熱した状態で圧入すること、およびアウタにインナ
を圧入した後に、アウタの内孔入口の周囲端面を押圧し
てアウタを塑性変形させることを含むものである。In these methods, press-fitting is performed to a predetermined position under an impact force, and at least one of an inner hole of an aluminum outer and an iron inner is heated to a temperature of 400 to 600 ° C.
And press-fitting the inner into the outer, and then pressing the peripheral end face of the inner hole entrance of the outer to plastically deform the outer.
【0007】[0007]
【発明の実施の形態】本発明におけるアウタはアルミニ
ウム合金製のものを対象としており、その孔部は切削加
工により形成する。鉄製のインナは、溶製材料または焼
結合金製のものであり、アウタのアルミニウム合金より
硬く、強靭であり、柱状または円筒状に成形したもので
ある。BEST MODE FOR CARRYING OUT THE INVENTION The outer in the present invention is intended to be made of an aluminum alloy, and its hole is formed by cutting. The iron inner is made of a molten material or a sintered alloy, is harder and stronger than the outer aluminum alloy, and is formed into a columnar or cylindrical shape.
【0008】鉄製インナの外周面は、圧入前方側に下底
を有する円錐台(テーパ)状であり、円錐(テーパ)面
としては、中間が膨らんだクラウニング状、下底近傍の
みがプレーンなもの、およびアウタ孔に装着し易いよう
に下底側に面取りまたは小径部を備えたものなどが用い
られる。後記の凸条の谷部に該当するインナの外周面
は、後に述べるようにアウタ孔に圧入するときのはめあ
いが、締まりばめの寸法関係になるように設定する。ま
た、円錐台状の下底と上底の凸条以外の部分の直径の差
(前記外周面の上下端部の直径の差)が10〜40μm
である。アウタ孔とインナは締まりばめの寸法関係に設
定されるので、上記直径差が大きすぎると、アウタ孔の
入口寸法に対してインナの下底寸法が著しく大きくな
り、圧入の際にアウタ孔の入口を剪断したり、押し広げ
て割れの原因となるので、40μmを上限にして、肉
厚、形状、材質等を考慮して設定する。また、鉄製イン
ナの圧入前方側に下底を有する円錐台(テーパ)状にす
る理由は、圧入したとき、後に述べるようにアウタの段
差部側の大径部に適合させることによって、インナの抜
けを防止することにあるので、直径差が僅かであり(プ
レーンな状態に近い)10μmより少ない状態では十分
な効果を期待することができない。The outer peripheral surface of the iron inner is frustoconical (tapered) having a lower bottom on the front side of the press-fitting. And one provided with a chamfer or a small diameter portion on the lower bottom side so as to be easily attached to the outer hole. As described later, the outer peripheral surface of the inner part corresponding to the valley portion of the ridge is set so that the fitting when press-fitting into the outer hole has the dimensional relationship of the interference fit. In addition, the difference in diameter between the lower and upper portions of the truncated cone other than the ridge (the difference in diameter between the upper and lower ends of the outer peripheral surface) is 10 to 40 μm.
It is. Since the outer hole and the inner are set in a dimensional relationship of the interference fit, if the diameter difference is too large, the bottom size of the inner becomes significantly larger than the inlet size of the outer hole. Since the inlet is sheared or pushed open to cause cracking, the upper limit is set to 40 μm and the thickness, shape, material and the like are taken into consideration. Also, the reason for forming the truncated cone (taper) having a lower bottom on the front side of the press-fitting of the iron inner is that when the press-fitting is performed, it is adapted to the large-diameter portion on the step portion side of the outer as described later. Therefore, a sufficient effect cannot be expected in a state where the diameter difference is small (close to a plain state) and less than 10 μm.
【0009】凸条には、断面形状が三角状、台状、半円
状、歯形状等のものや、インナの断面を多角形としたと
きに外周面に形成される稜線部などがあり、その場合
は、稜線の角が明瞭なもの、円弧状に面取りしたもの、
圧入方向の前方側を面取りしたものなどのいずれも適用
することができる。また、凸条は上下方向に同じ幅と高
さに形成するが、圧入の前方側の幅または高さを小さ
く、後方側の幅または高さを大きくした形状のものにし
て、圧入し易くする場合がある。凸条は、一端から他端
にわたって連続したもの、あるいは凸条の中間で1箇所
以上分断したものとすることができる。後者は、前者を
製作した後、旋盤などを用いて外周面を周方向に切削し
凸条の一部を除去する方法により得られる。凸条が分断
されて突起状に近付くと、圧入による接合の形態が複雑
になり、接合力が比較的高くなる。The ridges include those having a triangular, trapezoidal, semicircular, or tooth shape in cross section, or ridges formed on the outer peripheral surface when the inner cross section is polygonal. In that case, the edge of the ridgeline is clear, the one chamfered in an arc,
Any of those having a chamfered front side in the press-fitting direction can be applied. Also, the ridges are formed to have the same width and height in the vertical direction, but the width or height on the front side of the press-fitting is made small, and the width or height on the rear side is made large to facilitate press-fitting. There are cases. The ridge may be continuous from one end to the other end, or may be one or more divided in the middle of the ridge. The latter can be obtained by manufacturing the former, and then cutting the outer peripheral surface in the circumferential direction using a lathe or the like to remove a part of the ridge. When the protruding ridge is divided and approaches the protruding shape, the form of joining by press fitting becomes complicated, and the joining force becomes relatively high.
【0010】鉄製インナの外周面の凸条は、圧入の際に
アルミニウム製アウタに強く食い込み、アルミニウムの
新生面が現れて鉄製インナに凝着した状態で接合すると
ともに、緊迫力が生じて強く結合される。凸条の外周面
からの高さは、外周面が円筒形の場合は、7〜200μ
mの範囲である。7μmより低いものは顕著な効果が認
められない。200μmより高い場合は、外部材の内孔
へのインナの凸条の食い込みを大きくすることができる
反面、かじりを生じ易く、材料の歪が大きくなり、アウ
タの肉厚が薄い場合にはクラックを生じる懸念が増大
し、更にインナ外周面(凸条の谷部)がアウタの内孔面
と強く接触しない場合があるため好ましくない。外周面
の凸条の数は、一般的な大きさの直径20〜50mm程
度のものでは、10本から50本程度で十分である。外
周が多角柱形で稜線が軸心と平行なインナにおいては、
一般的な大きさの構造部材においては、外周の角数は3
6〜180角の範囲である。The protruding ridges on the outer peripheral surface of the iron inner strongly bite into the aluminum outer at the time of press-fitting, and a new surface of aluminum appears and joins in a state of being adhered to the iron inner. You. The height of the ridge from the outer peripheral surface is 7 to 200 μm when the outer peripheral surface is cylindrical.
m. If it is less than 7 μm, no remarkable effect is observed. When it is higher than 200 μm, it is possible to increase the bite of the inner ridge into the inner hole of the outer member, but on the other hand, it tends to cause galling, the material distortion becomes large, and when the outer wall is thin, cracks occur. This is not preferable because the possibility of occurrence is increased and the inner peripheral surface (the valley of the ridge) may not strongly contact the inner hole surface of the outer. As for the number of the ridges on the outer peripheral surface, about 10 to 50 suffices for a general size having a diameter of about 20 to 50 mm. In the inner case where the outer circumference is a polygonal column and the ridge is parallel to the axis,
For a structural member of a general size, the number of corners of the outer periphery is 3
It is in the range of 6 to 180 angles.
【0011】凸条は上下方向に真直な状態でもよいが、
斜歯(はすば)歯車のように周方向に傾斜させると、ね
じ込み状態にすることができ、アウタの装着孔からの離
脱が一層起こり難くなり、接合部の長さをより小さくす
ることができる。凸条が周方向へ傾きを有するものは、
粉末冶金法によるヘリカル歯車の成形と同様に、成形ダ
イまたはパンチが回転可能な成形金型を用いることによ
り容易に製作することができる。凸条の傾斜角は、30
゜以下にする必要があり、それ以上の角度では装着孔へ
のねじ込みが困難になる。内部材のねじ込みを行うため
に、内部材が柱状の場合には内部材の端面またははめ合
いしない外径部に、円筒状の場合には内周または端面の
少なくとも一方に、凸部または凹部を設けておき、この
凹凸に係合する凹凸を備えたレンチ工具を用いて回転押
し込みを行う。凹凸は、端面においてはラチェットのよ
うな形状が、内径面においては多角形状が好ましい。The ridge may be straight in the vertical direction,
If it is inclined in the circumferential direction like a helical gear (helical gear), it can be screwed in, the detachment of the outer from the mounting hole becomes more difficult, and the length of the joint can be made smaller. it can. If the ridge has a slope in the circumferential direction,
Like the helical gear formed by the powder metallurgy method, the helical gear can be easily manufactured by using a forming die in which a forming die or a punch can rotate. The inclination angle of the ridge is 30
It is necessary to set it to ゜ or less, and if it is larger than that, it becomes difficult to screw it into the mounting hole. In order to screw the inner member, when the inner member is columnar, at the end surface of the inner member or at an outer diameter portion that does not fit, or at least one of the inner periphery or the end surface when the inner member is cylindrical, a convex portion or a concave portion is formed. A rotary wrench is provided by using a wrench tool having projections and depressions engaging with the projections and depressions. The unevenness is preferably a ratchet-like shape on the end face and a polygonal shape on the inner diameter face.
【0012】アルミニウム製アウタの内孔は、インナの
圧入前方側に、インナの端面と当接させるための段差部
を備えている。この段差部側の内孔径は入口側の内孔径
よりも大きい。このような内孔の縦断面形状としては、
段差部側に下底を有する円錐台(テーパ)状のもの、同
様に円錐台状であり下底近傍だけがプレーン(軸心に平
行)なもの、上下方向に平行面(プレーンな筒状)で段
差部側が大きい直径にくり抜かれたものなどがある。内
孔面が円錐台(テーパ)状のものは、前述のインナの場
合と同様に、円錐台形状の下底と上底の凸条以外の部分
の直径の差が10〜40μmである。また、後者の内孔
がプレーンで段差部側が大径のものは、内孔入口をイン
ナの上底径と締まりばめが可能な寸法に設定し、大径部
は適当な大きさに作製する。The inner hole of the aluminum outer is provided with a step on the front side of the inner press-fitting for abutting on the end face of the inner. The inner hole diameter on the side of the step portion is larger than the inner hole diameter on the inlet side. As the vertical cross-sectional shape of such an inner hole,
A truncated cone (tapered) shape with a lower base on the step side, a frustoconical shape with only a plane near the lower base (parallel to the axis), a plane parallel to the vertical direction (plain cylindrical shape) In some cases, the step side is hollowed out to a large diameter. When the inner hole surface has a truncated cone (taper) shape, the difference in diameter between the lower and upper frustum-shaped portions other than the ridges is 10 to 40 μm, as in the case of the inner. Also, in the latter case where the inner hole is plain and the step side is large in diameter, the inner hole inlet is set to a size that can be tightly fitted with the upper bottom diameter of the inner, and the large diameter part is made to an appropriate size .
【0013】本発明の方法においては、外周面に複数の
凸条を備えた鉄製インナを、凸条の稜線に沿ってアウタ
の孔に圧入する。圧入の際に、インナの凸条部はアウタ
の装着孔の内壁に強く当たり、内壁のその部分は、他の
部分より高い面圧で滑入し、内壁部が塑性変形し高い緊
迫力が得られる。また、外部材がアルミニウム合金製で
あるから、接触表面においてアルミニウム合金表層の酸
化膜が破壊されて内部材と金属凝着が起こり、固着力が
増大する。また、インナは圧入前方が大径であり、アウ
タ孔は入口側が狭く奥が大径であるから、適度な塑性変
形と弾性変形により圧入されると、テーパ相互が嵌合し
た場合のように、インナの抜け出しが阻止される構造に
なり、一方はアウタの段差部で拘束されており、前述の
凝着と緊迫力と共により強い接合が得られる。このよう
な作用効果によって、インナの結合部の長さを従来のも
のより小さくしても、結合力は同等以上のものとなり、
使用中に離脱することなく、部材を薄く小さくすること
ができる。In the method of the present invention, an iron inner having a plurality of ridges on its outer peripheral surface is pressed into the outer hole along the ridge of the ridge. At the time of press-fitting, the ridge of the inner strongly hits the inner wall of the outer mounting hole, and that part of the inner wall slides in with a higher surface pressure than the other parts, and the inner wall is plastically deformed and a high tension is obtained. Can be Further, since the outer member is made of an aluminum alloy, the oxide film on the surface of the aluminum alloy is destroyed on the contact surface, metal adhesion to the inner member occurs, and the fixing force increases. Also, since the inner has a large diameter at the press-fit front and the outer hole has a narrow entrance side and a large diameter at the back, when it is press-fitted by moderate plastic deformation and elastic deformation, as in the case where the taper is fitted, The inner is prevented from coming out, and one is restrained by the step of the outer, so that a stronger joint can be obtained together with the adhesion and the tightening force described above. Due to such an effect, even if the length of the inner joint portion is made smaller than that of the conventional one, the joining force becomes equal to or more than
The member can be made thin and small without detaching during use.
【0014】圧入の際に、圧入の速さを毎秒10mm以
下に比較的小さくしても差し支えないが、毎秒100m
m程度以上の衝撃力下に圧入を行うことにより、内外部
材の緊迫力を高くすることができる。高速度の圧入で
は、圧入の荷重が高くなるが、アルミニウム製アウタの
内孔入口の緊迫力を高い状態にすることができ、凝着が
生じ易くなる。At the time of press-fitting, the press-fitting speed may be relatively small at 10 mm / sec or less,
By performing press-fitting under an impact force of about m or more, the tension force of the inner and outer members can be increased. In the case of high-speed press-fitting, the load of press-fitting increases, but the tightening force at the inner hole entrance of the aluminum outer can be made high, and adhesion tends to occur.
【0015】アルミニウム製アウタをやや軟化させた状
態で圧入すれば、圧入が容易になる。そのためには、ア
ウタ内孔部または鉄製インナを加熱しておけばよい。凸
条がヘリカル状に傾斜したものを適用する場合に効果が
大きい。温度は、400〜600℃であり、500℃が
最適である。低い温度では、加熱の効果が少なく、温度
が高すぎる場合には、両部材の材質が変化し、後処理が
必要になるので好ましくない。加熱による材質変化の少
ない鉄製インナを熱しておき、アルミニウム製アウタの
孔に嵌合させて熱伝導によってアウタを加熱する方法が
ある。また、溶体化および時効を施したアルミニウム合
金は、できるだけ材質の変化がない方が望ましいので、
アウタ部材を冷却しながら内孔部近傍だけ加熱すること
が好ましい。If the aluminum outer is press-fitted in a slightly softened state, the press-fitting becomes easier. For that purpose, the outer inner hole or the iron inner may be heated. The effect is large when applying a ridge in which the ridge is inclined in a helical shape. The temperature is between 400 and 600C, with 500C being optimal. If the temperature is too low, the effect of heating is small, and if the temperature is too high, the materials of both members change, and post-treatment is required, which is not preferable. There is a method in which an iron inner having little change in material due to heating is heated, fitted into a hole of an aluminum outer, and the outer is heated by heat conduction. In addition, it is desirable that the solution and the aged aluminum alloy have as little material change as possible,
It is preferable to heat only the vicinity of the inner hole while cooling the outer member.
【0016】接合面に銅、錫、亜鉛合金はんだ等の被膜
を介在させることにより、接合力はより高くなる。被膜
は、メッキや金属塗料の塗布により鉄製インナの外周面
に形成することが望ましい。[0016] By interposing a coating of copper, tin, zinc alloy solder or the like on the joining surface, the joining force is further increased. The coating is desirably formed on the outer peripheral surface of the iron inner by plating or applying a metal paint.
【0017】圧入した後に、アルミニウム製アウタの内
孔の周囲端面をパンチで押して、塑性変形および加工硬
化を生じさせると、アウタ内孔の入口近傍の緊迫力を増
大させ、接合を良好にすることができる。特に、アウタ
とインナの圧入量を大きく設定した場合や、アウタの入
口部がインナで拡張するような場合に効果が大きく、よ
り接合がより確実になる。After the press-fitting, when the peripheral end face of the inner hole of the aluminum outer is pressed with a punch to cause plastic deformation and work hardening, the tightening force near the entrance of the outer inner hole is increased to improve the joining. Can be. In particular, when the press-fit amount of the outer and the inner is set to be large, or when the inlet of the outer is expanded by the inner, the effect is great, and the joining is more reliable.
【0018】[0018]
【実施例】以下、実施例により本発明を説明する。図1
(a)は、インナ1の平面図であり、図1(b)はその
側面図である。図1(a)では凸条3を実際の寸法比よ
りも大きく表し、図1(b)では凸条3を線分のみで示
した模式図である。インナ1は、外周面2の下方に下底
を有する円錐台からなり、外周面2に断面が三角形状で
高さが30μmの凸条を有する鉄合金製の部材である。
外周面2における上底直径と下底直径の差は20μmで
ある。なお、インナ1は焼結合金鋼製であり、金型で粉
末成形し、焼結およびサイジングを行って製作した。The present invention will be described below with reference to examples. FIG.
1A is a plan view of the inner 1, and FIG. 1B is a side view thereof. FIG. 1A is a schematic diagram showing the ridges 3 larger than the actual dimensional ratio, and FIG. 1B is a schematic diagram showing the ridges 3 only by line segments. The inner 1 is a member made of an iron alloy having a truncated cone having a lower bottom below the outer peripheral surface 2, and having a triangular cross section on the outer peripheral surface 2 and a ridge having a height of 30 μm.
The difference between the upper base diameter and the lower base diameter on the outer peripheral surface 2 is 20 μm. The inner 1 was made of a sintered alloy steel, and was manufactured by powder molding with a mold, sintering and sizing.
【0019】図2は、インナ1の形状例を模式的に示す
側面図である。図2(a)は円錐台状、図2(b)はク
ラウニング状および図2(c)は下端部のみを円筒状に
した円錐台からなるものであり、いずれも同様の効果が
得られる。FIG. 2 is a side view schematically showing an example of the shape of the inner 1. 2 (a) is a truncated cone, FIG. 2 (b) is a crowned cone, and FIG. 2 (c) is a truncated cone having only a lower end in a cylindrical shape, and all have the same effect.
【0020】図3は、アウタ5の内孔部の形状例を模式
的に示す縦断面図である。図3(a)は円錐台状、図3
(b)は円錐台状で下方の段差部付近が円筒状であり、
図3(c)はプレーンな円筒状で下方の段差部付近が大
径である円錐台状である。さらに図3(d)は図3
(c)と同様で大径部の形状が円盤状のものを示す。ア
ウタ5は、鋳造および熱処理したものであり、孔部は切
削加工により作製する。図3(a)から図(d)におい
て、孔部の上底直径と下底直径との差は、インナ1の場
合とほぼ同様に設定され20μmである。孔部の入口の
直径寸法は、インナ1の外周面2の上底直径とのはめあ
いにおいて締まりばめの状態とし、同一寸法にすること
が好ましい。孔部の下底には段差部51を形成し、大径
部52においてインナ1と当接し得るようにする。FIG. 3 is a longitudinal sectional view schematically showing an example of the shape of the inner hole of the outer 5. FIG. 3A shows a truncated cone shape, and FIG.
(B) is a truncated cone with a cylindrical shape near the lower step,
FIG. 3C shows a plain cylindrical shape having a truncated cone shape having a large diameter near the lower step portion. Further, FIG.
As in (c), the large-diameter portion has a disk shape. The outer 5 is cast and heat-treated, and the hole is formed by cutting. 3 (a) to 3 (d), the difference between the upper bottom diameter and the lower bottom diameter of the hole is set to be substantially the same as in the case of the inner 1, and is 20 μm. It is preferable that the diameter of the inlet of the hole is in an interference fit when the inner diameter of the inner surface of the inner surface of the inner surface 1 is fitted to the upper surface of the inner surface 2 and has the same size. A step portion 51 is formed at the lower bottom of the hole so that the large diameter portion 52 can contact the inner 1.
【0021】図4は、アウタ5とインナ1とを圧入接合
する状態を説明する部分縦断面図である。圧入の際に
は、プレスの基台6の上にアウタ5をセットし、アウタ
5の孔にインナ1を押込パンチ7により圧入する。押込
パンチ7は、スラストベアリング(図示せず)を有して
おり、傾斜した凸条に沿って回転するインナ1に追従し
て回転する。インナ1の上端面と押込パンチ7の下端面
に凹凸を設けて係合させ、押込パンチ7を機械的に回転
させて圧入する方がよい場合もある。なお、図示のイン
ナ1は図1に示したものであり、アウタ5は図3(d)
に示した形状のものである。FIG. 4 is a partial longitudinal sectional view for explaining a state in which the outer 5 and the inner 1 are press-fitted and joined. At the time of press-fitting, the outer 5 is set on the base 6 of the press, and the inner 1 is press-fitted into the hole of the outer 5 by the pressing punch 7. The pushing punch 7 has a thrust bearing (not shown), and rotates following the inner 1 rotating along the inclined ridge. In some cases, it may be better to engage the upper end surface of the inner 1 with the lower end surface of the pushing punch 7 by providing unevenness and mechanically rotating the pushing punch 7 for press-fitting. The inner 1 shown is that shown in FIG. 1, and the outer 5 is shown in FIG.
The shape shown in FIG.
【0022】鉄製インナ1をアルミニウム製アウタ5の
孔に押し込むと、凸条3が斜歯歯車のように傾斜して設
けてあるので、インナ1はねじ込まれるように回転し、
凸条3はアウタ5に食い込んでアウタ5を塑性変形さ
せ、外周面2はアウタ5を主に弾性変形させる。両部材
の擦れ合った面は凝着状態となり、押し込みが終わる
と、アウタ5は弾性によりインナ1を強く握り込む状態
になる。圧入により、インナ1の下底部は、アウタ5の
段差部51に当接するとともに大径部52に収容される
ので、前述の作用共に離脱が起こり難い、強い接合が得
られる。When the iron inner 1 is pushed into the hole of the aluminum outer 5, the ridge 3 is provided to be inclined like a helical gear, so that the inner 1 rotates so as to be screwed in.
The ridges 3 bite into the outer 5 to plastically deform the outer 5, and the outer peripheral surface 2 mainly deforms the outer 5 elastically. The rubbed surfaces of both members are in a cohesive state, and when the pushing is completed, the outer 5 is in a state of firmly gripping the inner 1 by elasticity. By the press-fitting, the lower bottom portion of the inner 1 comes into contact with the step portion 51 of the outer 5 and is accommodated in the large-diameter portion 52, so that the above-mentioned actions are hardly separated and a strong joint is obtained.
【0023】上記実施例の場合には、アウタ5の入口5
3の部分の圧入量は大径部52より少ない。そこで、外
パンチ8により、アウタ5の入口53の周囲の端面を加
圧し塑性変形させると、インナ1をより強く握り絞める
状態になる。In the case of the above embodiment, the inlet 5 of the outer 5
The press-fit amount of the portion 3 is smaller than the large-diameter portion 52. Then, when the outer punch 8 presses the end face around the entrance 53 of the outer 5 and plastically deforms it, the inner 1 is more strongly squeezed and squeezed.
【0024】従来の圧入接合に比べて、強い接合力が得
られるので、同じ直径のものであっても接合長さの短い
部材とすることが可能になる。Since a stronger joining force can be obtained as compared with the conventional press-fitting joining, members having the same diameter but shorter joining length can be obtained.
【0025】[0025]
【発明の効果】以上のように、この発明の接合方法にお
いては、アウタ孔に段差部を設けるとともに段差部側の
内孔径が入口側の内孔径より大きく形成したあり、一
方、インナは円錐台形状で凸条を備えており、下底側か
ら圧入されるので、凸条による両部材の接合と、締まり
ばめによる緊迫力と、段差部および大径部相互の組合せ
による抜け止め効果とによって、両部材の結合をより強
くすることができる。そのため、部材の高さや容積をよ
り小さくすることが可能となり、軽量化、放熱性の向上
などを実現することができる。As described above, in the joining method of the present invention, the stepped portion is provided in the outer hole, and the inner hole diameter on the stepped portion side is formed larger than the inner hole diameter on the inlet side. It has a ridge in shape and is press-fitted from the bottom side, so the joining of both members by the ridge, the tightening force by interference fit, and the retaining effect by the combination of the step portion and the large diameter portion The connection between the two members can be further strengthened. Therefore, it is possible to further reduce the height and volume of the member, and it is possible to realize weight reduction, improvement in heat dissipation, and the like.
【図1】図1(a)は本発明に用いるインナの平面図で
あり、図1(b)はその側面図である。FIG. 1A is a plan view of an inner used in the present invention, and FIG. 1B is a side view thereof.
【図2】図2(a)から(c)はインナの形状の例を模
式的に示す側面図である。FIGS. 2A to 2C are side views schematically showing examples of inner shapes.
【図3】図3(a)から(d)はアウタの内孔部の形状
の例を模式的に示す縦断面図である。3 (a) to 3 (d) are longitudinal sectional views schematically showing examples of the shape of an inner hole of an outer.
【図4】アウタとインナとを圧入接合する状態を説明す
る部分縦断面図である。FIG. 4 is a partial longitudinal sectional view illustrating a state in which an outer and an inner are press-fitted and joined.
1 インナ 2 外周面 3 凸条 5 アウタ 6 基台 7 押込パンチ 8 外パンチ 51 段差部 52 大径部 53 入口 DESCRIPTION OF SYMBOLS 1 Inner 2 Outer peripheral surface 3 Convex stripe 5 Outer 6 Base 7 Push punch 8 Outer punch 51 Step part 52 Large diameter part 53 Inlet
───────────────────────────────────────────────────── フロントページの続き (72)発明者 江平 淳 神奈川県横浜市神奈川区宝町2番地 日産 自動車株式会社内 (72)発明者 眞木 邦雄 神奈川県横浜市神奈川区宝町2番地 日産 自動車株式会社内 (72)発明者 安保 定幸 神奈川県横浜市神奈川区宝町2番地 日産 自動車株式会社内 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Jun Ehira, Nissan Motor Co., Ltd., 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Prefecture (72) Inventor Kunio Maki Nissan Motor Co., Ltd., 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Prefecture ( 72) Inventor Sadayuki Abo 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa
Claims (7)
ナを圧入し接合する方法において、鉄製インナの接合面
となる外周面に、軸心に対して平行あるいは傾斜角30
゜以下で、高さが7〜200μmであり、かつ圧入方向
に連続または断続した複数の凸条を設けるとともに、該
外周面を圧入前方側に下底を有する円錐台状に形成し、
アルミニウム製アウタの内孔の前記インナの圧入前方側
に、インナの端面と当接する段差部を設けるとともに、
段差部側の内孔径を入口側の内孔径より大きく形成し、
前記凸条の稜線に沿って締まりばめにより圧入すること
を特徴とするアルミニウム製アウタと鉄製インナの圧入
接合方法。1. A method for press-fitting and joining an iron inner into an inner hole of an aluminum outer, wherein an outer peripheral surface serving as a joining surface of the iron inner is parallel or inclined with respect to an axis.
゜ Below, the height is 7 to 200 μm, and a plurality of ridges continuous or intermittent in the press-fitting direction are provided, and the outer peripheral surface is formed in a truncated cone shape having a lower bottom on the press-fitting front side,
At the inner press-fitting front side of the inner hole of the aluminum outer, a stepped portion that comes into contact with the end face of the inner is provided,
The inner hole diameter on the step side is formed larger than the inner hole diameter on the inlet side,
A method of press-fitting an aluminum outer and an iron inner, wherein the outer and the inner are press-fitted along the ridge line of the ridge by interference fit.
ンナの圧入前方側に下底を有する円錐台状、または軸心
と平行な筒状であって段差部側に大径部を有することを
特徴とする請求項1に記載のアルミニウム製アウタと鉄
製インナの圧入接合方法。2. An inner hole of the aluminum outer having a truncated conical shape having a lower bottom on the front side of the inner press-fit, or a cylindrical shape parallel to the axis and having a large diameter portion on the step portion side. 2. The method of press-fitting an aluminum outer and an iron inner according to claim 1, wherein:
下底と上底の凸条以外の部分の直径の差が10〜40μ
mであることを特徴とする請求項1または2に記載のア
ルミニウム製アウタと鉄製インナの圧入接合方法。3. The difference in diameter of the inner or outer truncated cone-shaped lower and upper portions other than the ridges is 10 to 40 μm.
3. The method of press-fitting an aluminum outer and an iron inner according to claim 1 or 2, wherein m is m.
に圧入することを特徴とする請求項1から3のいずれか
に記載のアルミニウム製アウタと鉄製インナの圧入接合
方法。4. The method of press-fitting an aluminum outer and an iron inner according to claim 1, wherein the press-fitting is performed by press-fitting to a predetermined position under an impact force.
よび鉄製インナの少なくとも一方を、温度400〜60
0℃に加熱した状態で圧入することを特徴とする請求項
1から4のいずれかに記載のアルミニウム製アウタと鉄
製インナの圧入接合方法。5. The method according to claim 5, wherein at least one of the vicinity of the inner hole of the aluminum outer member and the iron inner member has a temperature of 400 to
The method of press-fitting an aluminum outer and an iron inner according to any one of claims 1 to 4, wherein the press-fitting is performed while heating to 0 ° C.
ウタの内孔入口の周囲端面を押圧してアウタを塑性変形
させることを特徴とする請求項1から5のいずれかに記
載のアルミニウム製アウタと鉄製インナの圧入接合方
法。6. The aluminum outer according to claim 1, wherein, after the inner is press-fitted into the outer, the outer end is plastically deformed by pressing a peripheral end surface of an inner hole entrance of the outer. Press-fitting method between steel and iron inner.
ドであり、インナが鉄系焼結合金の弁座である請求項1
から6のいずれかに記載のアルミニウム製アウタと鉄製
インナの圧入接合方法。7. The engine according to claim 1, wherein the outer is a cylinder head of an internal combustion engine, and the inner is a valve seat made of an iron-based sintered alloy.
7. The method of press-fitting an aluminum outer and an iron inner according to any one of items 1 to 6, above.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21574097A JPH1142513A (en) | 1997-07-25 | 1997-07-25 | Press-in join method of aluminum-made outer and iron-made inner |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21574097A JPH1142513A (en) | 1997-07-25 | 1997-07-25 | Press-in join method of aluminum-made outer and iron-made inner |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH1142513A true JPH1142513A (en) | 1999-02-16 |
Family
ID=16677424
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP21574097A Pending JPH1142513A (en) | 1997-07-25 | 1997-07-25 | Press-in join method of aluminum-made outer and iron-made inner |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH1142513A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104858612A (en) * | 2015-03-29 | 2015-08-26 | 安徽同丰橡塑工业有限公司 | Mounting method of valve retainer |
JP2019126872A (en) * | 2018-01-24 | 2019-08-01 | 株式会社アスター | Joint member, joining method and joined body |
-
1997
- 1997-07-25 JP JP21574097A patent/JPH1142513A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104858612A (en) * | 2015-03-29 | 2015-08-26 | 安徽同丰橡塑工业有限公司 | Mounting method of valve retainer |
JP2019126872A (en) * | 2018-01-24 | 2019-08-01 | 株式会社アスター | Joint member, joining method and joined body |
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