JPS62230433A - Pipe expansion ball working method and its device - Google Patents
Pipe expansion ball working method and its deviceInfo
- Publication number
- JPS62230433A JPS62230433A JP7632486A JP7632486A JPS62230433A JP S62230433 A JPS62230433 A JP S62230433A JP 7632486 A JP7632486 A JP 7632486A JP 7632486 A JP7632486 A JP 7632486A JP S62230433 A JPS62230433 A JP S62230433A
- Authority
- JP
- Japan
- Prior art keywords
- die
- dies
- tube
- pipe
- blank pipe
- 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
- 238000000034 method Methods 0.000 title claims description 23
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 27
- 239000010959 steel Substances 0.000 claims abstract description 27
- 238000009826 distribution Methods 0.000 claims abstract description 9
- 206010013781 dry mouth Diseases 0.000 claims description 3
- 238000003754 machining Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 27
- 239000002184 metal Substances 0.000 abstract description 6
- 229910052751 metal Inorganic materials 0.000 abstract description 6
- 238000012545 processing Methods 0.000 description 12
- 238000009864 tensile test Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000003672 processing method Methods 0.000 description 5
- 238000000137 annealing Methods 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 230000006378 damage Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 241000282465 Canis Species 0.000 description 1
- 206010039509 Scab Diseases 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 210000003464 cuspid Anatomy 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
Landscapes
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
(産業−[−の利用分野)
本発明は、管材の一部を拡管成形する拡管加工法および
その装置に関し、さらに詳しくは、液圧またはゴム圧を
利用した従来のバルジ加工法では成形が困難とされたC
u、AI材等、加−[−硬化しにくい軟質金属に大きな
拡管率の拡管加工を施すことができる新規な拡管ボール
加−1−法およびその装置に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of application in industry) The present invention relates to a pipe expansion method and apparatus for expanding a part of a pipe material, and more particularly, to a pipe expansion method and apparatus for expanding a part of a pipe material. C, which was difficult to form using the bulge processing method.
The present invention relates to a new tube expansion ball forming method and its apparatus, which can perform tube expansion processing with a large tube expansion rate on soft metals that are difficult to harden, such as AI materials.
(従来の技術)
通常、管材の拡管加工はローラによる加:[、バルジ加
]二によって行われ、このうちローラによる加工は第8
図の(A)に示す如く、管(1)の内側に心金(2)を
入れ、これを回転させ乍ら(B)のように外周ローラ(
3)に押し当てて成形する。しかし、この方法は小径管
の加工には不向きであり、また広範囲にわたって管材を
拡管する加]二にも不向きであるので、このような特殊
な加工には以ドに述べるバルジ加−1―法が主として用
いられる。(Prior art) Normally, the expansion process of pipe materials is performed by roller machining: [, bulge machining].
As shown in (A) of the figure, the mandrel (2) is placed inside the tube (1), and while it is rotated, the outer peripheral roller (2) is rotated as shown in (B).
3) Press and form. However, this method is not suitable for processing small-diameter pipes, nor is it suitable for expanding pipe materials over a wide range.For such special processing, the bulge forming method described below is recommended. is mainly used.
即ち、バルジ加1〕は管材に内圧と軸圧を加えて素管の
一部を張出し成形する加工法であって、ゴムまたは油を
利用して行われている。第9図は・−般にフリーバルジ
加工法と称されるもので、素管(4)に内圧、Piと軸
圧Pzを加えて拡管加工する。該フリーバルジ加工法は
軸方向圧縮長さを換えることにより、膨出部の肉厚を変
えることができる特徴がある。That is, bulging 1] is a processing method in which internal pressure and axial pressure are applied to a tube material to stretch and mold a part of the raw tube, and is performed using rubber or oil. FIG. 9 shows what is generally called the free bulge processing method, in which internal pressure, Pi, and axial pressure Pz are applied to the raw pipe (4) to expand the pipe. The free bulge processing method is characterized in that the wall thickness of the bulging portion can be changed by changing the axial compression length.
(発明が解決しようとする問題点)
上述のように液厚バルジ加1−法の基本的加工原、理は
素管に内圧を加えて膨出し、型内に充満成形することに
あり、材料はこの膨出によって延伸されるが、液体また
はゴムのように、材料の異状変形を抑えることができな
い媒体を用いて行う加]二においては、局部的くびれの
発生を防ぐことはできない。そして一旦(びれが発生す
ると、以後の変形はくびれ部に集中しておこるため、く
びれ部から早期に破壊する。(Problems to be Solved by the Invention) As mentioned above, the basic processing principle of the liquid thickness bulging method is to apply internal pressure to the raw pipe to bulge it and fill it in the mold. is stretched by this bulge, but when using a medium such as liquid or rubber that cannot suppress abnormal deformation of the material, it is not possible to prevent the occurrence of local constrictions. Once a constriction occurs, subsequent deformation is concentrated at the constriction, causing early failure from the constriction.
くびれの発生は式[11に表されている拡管率に基づい
ておこる。The occurrence of constriction occurs based on the tube expansion rate expressed by equation [11].
1)=I)o−ell:0
tQo=−+・(α−2)・m
ここで、
I)o、I):拡管加工前後の外径
eO:円周方向歪6
α:応力比
α=σ2/σO
ただし
σ2.σ0:軸方向および円周方向応力m:乗則、σ=
C−εmの定数
ただし
σ:応カ
ニ歪み
C:材料によって定まる定数
また、純AI材の応力と歪みの関係(1乗則)は式[2
]であられされる。1)=I)o-ell:0 tQo=-+・(α-2)・m Here, I)o, I): Outer diameter before and after tube expansion eO: Circumferential strain 6 α: Stress ratio α =σ2/σO where σ2. σ0: Axial and circumferential stress m: Power law, σ=
C-εm constant, where σ: corresponding strain C: constant determined by material Also, the relationship between stress and strain (first power law) of pure AI material is expressed by formula [2
].
σ=8.43・f:#、IA〜l ’3 c 2
]いま軸圧が負荷されない状態(σz=0.α=0)、
および円周方向応力と同じ大きさの圧縮応力を軸方向に
加えた場合(σ2=−σθ、α=−1)、くびれが生ず
る円周方向歪み(拡管率)は下記のごとく、
a=OCaz=0 ) I)/I)o=1.09
a=−1(crz=−aO)D/Do=1.13注)m
の値は式[2コの平均をとり、m:0.125とした。σ=8.43・f:#, IA~l '3 c 2
] Currently no axial pressure is applied (σz=0.α=0),
When compressive stress of the same magnitude as the circumferential stress is applied in the axial direction (σ2=-σθ, α=-1), the circumferential strain (pipe expansion rate) that causes constriction is as follows: a=OCaz =0) I)/I)o=1.09
a=-1(crz=-aO)D/Do=1.13Note)m
The value was calculated using the formula [2 values were averaged, and m: 0.125.
軸方向の圧縮応力が大きくなるにつれて、くびれ発生限
界は大きくなる。しかし、純AI′材の引張り試験にお
ける伸びは50%以−ヒあるため、大きい軸荷重の基で
バルジ加工を行ったとしても、くびれが発生する時期は
引張り試験におけるのびの値よりはるかに小さい。そし
て、一旦くびれが生ずると、以後拡管による円周方向の
歪みは純AI材のように加工硬化し龜(い材料において
はくびれにくに集中するため、引張り試験によって得ら
れる伸びの値よりはるかに小さい拡管率で破壊iる。As the compressive stress in the axial direction increases, the limit for occurrence of constriction increases. However, the elongation of pure AI' material in the tensile test is more than 50%, so even if bulge processing is performed under a large axial load, the time at which constriction occurs is much smaller than the elongation value in the tensile test. . Once a constriction occurs, the strain in the circumferential direction due to pipe expansion is concentrated at the constriction in materials that are work hardened and hardened like pure AI materials, so the elongation value is much greater than the elongation value obtained by the tensile test. Destruction occurs with a small tube expansion rate.
また、式[1]から明らかなどと<、くびれ限界は応力
比αと引張り試験における1乗則の係数mによって定ま
る。ステンレス鋼のように加工硬化しやすく、mの値が
大きい材料ではくびれ限界は大きいが、純AI材のよう
に加工硬化しにくく、mの値が小さい材料ではくびれが
生じやすく、拡管加工をむつかしくする大きな原因にな
ついる。Also, as is clear from equation [1], the constriction limit is determined by the stress ratio α and the coefficient m of the first power law in the tensile test. Materials that are easy to work harden and have a large value of m, such as stainless steel, have a large constriction limit, but materials that are difficult to work harden and have a small value of m, such as pure AI materials, are prone to constriction, making tube expansion difficult. It's a big reason why.
これらのことから明らかなように、紙AI材あるいは純
Cu材等、加工硬化しにくい軟質金属の拡管加工には、
従来入念な作業管理が必要であった。As is clear from these facts, it is necessary to expand the tubes of soft metals that are difficult to work harden, such as paper AI materials or pure Cu materials.
Previously, careful work management was required.
そこで、本発明は−1−記軟質金属の拡管加工を容易と
する新しい拡管法およびその装置の提供を目的とする。Therefore, an object of the present invention is to provide a new tube expansion method and apparatus for facilitating tube expansion of soft metals.
(問題点を解決するための手段)
本発明は、相対向する面にそれぞれ型彫り面をもった一
対のダイス内に、予め口絞りした素管をセットし、該素
管内に適切な球径分布をもった鋼球を多数個収容した状
態から、上記一対のダイスを相対的に接近移動させつつ
回転させて、上記素管を圧縮すると同時に、該素管内の
鋼球を上記回転によって素管内面を衝撃させ、しかして
該素管を−I〕記型彫り面に倣って膨出させる拡管ボー
ル加1″、法を特徴とし、
さらには、相対向する面にそれぞれ型彫り而を自゛して
対向保持された一対のダイスと、両ダイス内にわたって
セットされた口絞り素管と、この素管内に収容された多
数個の鋼球と、上記両ダイスを相対的に近接移動させる
シリンダ、および両ダイスの回転駆動機構を備えた拡管
ボール加工装置を特徴とする。(Means for Solving the Problems) The present invention involves setting a pre-drawn blank tube in a pair of dies each having a die-cutting surface on opposing surfaces, and inserting an appropriate spherical diameter into the blank tube. With a large number of well-distributed steel balls accommodated, the pair of dies are rotated while moving relatively close to each other to compress the raw pipe, and at the same time, the steel balls in the raw pipe are compressed by the rotation. It is characterized by a tube expansion ball addition method that impacts the surface and causes the raw tube to bulge out following the die-engraved surface.Furthermore, the die-engraved surface is automatically engraved on each of the opposing surfaces. a pair of dies held facing each other, a neck-drawn blank tube set across both dies, a large number of steel balls housed in the blank tube, and a cylinder that moves both dies relatively close to each other; The present invention is characterized by a tube expansion ball processing device equipped with a rotation drive mechanism for both dies.
(作用)
本発明の原理は、各種実験に基づいて得られた上記の如
き知見による。(Operation) The principle of the present invention is based on the above findings obtained based on various experiments.
管材に軸荷重を与えて圧縮すると、管材の長さが直径に
比べて短いときは、はぼ長さの中央部が外側に張出し、
管材が長いときは両端部が張出し、いずれの場合も内側
に凹むことはない。張出させる軸荷重は、絞り部がない
平行管材においては大きいが、第6図および第7図に示
すごとく、絞り部をつけると小さい軸荷重で張出さすこ
とができる。第6図および第7図において、(A)は据
込み前、(B)は据込み後をそれぞれ示し、IL’l絞
りした素管(5)(G)をダイス(7)(8)に入れて
軸荷重を負荷すると、素管の胴部長さLが素管の直径り
に比べて長いときは(L/D:大)、第6図に示すごと
く、両端[l絞り部に隣接して膨らみが生じ、L/1)
が小さく、胴部長さが短いときは、第7図に示すごとく
中央部に膨らみが生ずる。When compressing a pipe by applying an axial load, if the length of the pipe is shorter than its diameter, the center of the pipe length will bulge outward,
When the tube material is long, both ends protrude, and in either case, it does not recess inward. The axial load for elongation is large in a parallel tube without a constricted part, but as shown in FIGS. 6 and 7, when a constricted part is provided, elongation can be achieved with a small axial load. In Figures 6 and 7, (A) shows the state before upsetting, and (B) shows the state after upsetting, respectively. When the body length L of the raw pipe is longer than the diameter of the raw pipe (L/D: large), as shown in Figure 6, both ends [L adjacent to the constricted part] bulge occurs, L/1)
When the body length is small and the body length is short, a bulge will appear in the center as shown in FIG.
さらに軸荷重を大きくすると座屈によって素管は圧壊す
るが、圧壊する直前の軸荷重を口絞り素管にIjえ、と
の杖態を保ちながら胴部長さが長い素管(5)に対して
は胴中央の凹み部(5a)に、胴部長さの短い素管(8
)に対しては胴中央の凸部(lEa)に塑性変形を与え
ると管材は膨出し、ダイスの型彫り面に沿った形に成形
される。胴部が長い素管(5)は第6図に示すごとく、
初期軸荷重によって両端口絞り部に隣接した個所が膨ら
み、つづみ形になるが、中央の凹み(5a)を塑性加工
によって凸形に変形させた後は、胴部長さが短い素管(
6)と形状的に同じになるため、両者同じ条件を拡管加
工することができる。If the axial load is increased further, the raw pipe will collapse due to buckling, but the axial load just before crushing is applied to the raw pipe with a narrowed opening, and the pipe with a long body length is In the recessed part (5a) in the center of the body, insert a blank pipe with a short body length (8
), when the convex portion (lEa) at the center of the body is plastically deformed, the tube material swells and is formed into a shape along the die-scabbing surface of the die. The raw pipe (5) with a long body is as shown in Figure 6.
Due to the initial axial load, the parts adjacent to the constricted portions at both ends bulge out, forming a concave shape, but after the central concave (5a) is deformed into a convex shape by plastic working, it becomes a blank pipe with a short body length (
6), so both can be expanded under the same conditions.
本発明は、上記胴中央の凹み部、凸部に塑性変形をIj
、え、かつ管材を膨出させるために、適切な球径分布を
もった多数個の鋼球を用いることに特徴がある。The present invention applies plastic deformation to the concave portion and convex portion at the center of the body.
Moreover, it is characterized by the use of a large number of steel balls with an appropriate ball diameter distribution in order to bulge the pipe material.
(実施例)
以下、本発明を第1図乃至第3図の実施例図面によって
説明する。(Example) Hereinafter, the present invention will be explained with reference to the example drawings of FIGS. 1 to 3.
架台(9)の1ユに2組のローラ(10)および小歯車
(■)が取付けられており、ローラ(10)の上に一対
のダイス(12)(13)が置かれている。これらのダ
イスの相対する而(14)(15)には成形目的の形状
の型が彫られている。ダイス(12)(13)の外側に
は犬歯+1f、(1B)(17)が切られており、小歯
車(11)に歯合っている。Two sets of rollers (10) and a small gear (■) are attached to one unit of the frame (9), and a pair of dies (12) and (13) are placed on the roller (10). The opposite sides (14) and (15) of these dies are engraved with a mold of the shape intended for molding. Canine teeth +1f, (1B) (17) are cut on the outside of the dies (12) and (13), and mesh with the small gear (11).
ダイス(13)には駆動軸(18)が取付けられていて
、別途に設けられている駆動装置によって該ダイスを回
転する。この回転は犬歯+l[(17)から小歯11【
(ll)に伝わり、さらに大歯車(1B)に伝わり、ダ
イス(12)をダイス(+3)と同じ速さで回転させる
。ダイス(12)にはスラスト軸受(鳳8)を介して、
架台(9)で受けられているシリンダー(20)が取付
けられており、ダイス(12)を前後進させるとともに
、ダイス(+2)(13)の間にセットされた口絞り素
管(21)に軸力を負荷すべく構成される。A drive shaft (18) is attached to the die (13), and the die is rotated by a separately provided drive device. This rotation is from canine + l [(17) to small tooth 11 [
(ll), and then to the large gear (1B), which rotates the die (12) at the same speed as the die (+3). The die (12) is equipped with a thrust bearing (Otori 8).
A cylinder (20) is attached to the frame (9), which moves the die (12) back and forth, and also moves the die (+2) and the cylinder (21) set between the die (+2) and (13). Constructed to apply axial force.
本発明の拡管加工は次の手順によって杼う。The tube expansion process of the present invention is carried out by the following procedure.
a、平行円筒形素管の両端部を絞った11絞り素管(2
K)を予め用意する。この口絞り加工はスピニング法に
よると容易に成形できる。a, 11-drawn blank tube (2
Prepare K) in advance. This mouth drawing process can be easily performed by the spinning method.
b、ダイス(13)の中心孔(22)に摩耗防止のため
ゴムなどのライナー材(23)を入れてから11絞り素
管の一端を挿入する。b. Put a liner material (23) such as rubber into the center hole (22) of the die (13) to prevent wear, and then insert one end of the 11-drawn blank tube.
C,ダイス(12)の中央孔(24)に1」絞り素管(
21)の他端を挿入し、着金(25)のポル)(2B)
を外し、シリンダー(20)のピストン棒を後退させて
着金(25)をダイス02)から外す。C, Insert a 1" drawn blank tube into the center hole (24) of the die (12).
21) Insert the other end and secure it (25) (2B)
, and move the piston rod of the cylinder (20) backward to remove the metal attachment (25) from the die 02).
d、中心孔(24)から適切な球径分布をした鋼球(2
6)を[1絞り素管(21)の内容積の約半分まで装入
する。d. Steel balls (2) with appropriate ball diameter distribution are inserted from the center hole (24).
6) is charged to about half of the internal volume of the 1-squeezed blank tube (21).
e、中心孔(24)にライナー材(27)を入れた後、
シリンダー(20)のピストン棒を前進させて着金(2
5)を中心孔(24)に挿入してポル1−(2G)を締
付ける。e. After putting the liner material (27) into the center hole (24),
Move the piston rod of the cylinder (20) forward to deposit the money (2
5) into the center hole (24) and tighten Pole 1-(2G).
f、駆動装置によってダイス(12)(+3)を回転さ
せ、シリンダー(20)によってダイス(12)をダイ
ス(13)の方に押付け、口絞り素管(21)に軸力を
負−;lする。軸力の負荷はダイス(12)(13)の
間の間隙からL1絞り素管の外形の変化を観察しながら
行い。両ダイスを密着させる。f, the drive device rotates the die (12) (+3), the cylinder (20) presses the die (12) towards the die (13), and applies a negative axial force to the mouth-drawn tube (21); do. The axial force was applied while observing the change in the external shape of the L1 choke tube from the gap between the dies (12) and (13). Place both dice in close contact.
g、ダイス(12)(+3)が密着した後も、しばらく
間ダイスは回転させ、鋼球(26)の衝撃力によって、
「1絞り素管(2I)が型内面によく密着するようにす
る。第3図に成形されたときの状態を示す尚、実験によ
れば、好ましくは、使用する鋼球の最大径は第4図に示
すごとく、開口部内径DOまたは仕上がり品の最小半径
Rfの2倍(2・Rf)以下とし、開口部内径DOが仕
上がり品(21a)の最小゛1つ径Rfの2倍より大き
いときは(D。g. Even after the dice (12) (+3) are in close contact, the dice are kept rotating for a while, and due to the impact force of the steel ball (26),
``Make sure that the 1-drawn blank tube (2I) is in close contact with the inner surface of the mold. Figure 3 shows the state when it is formed. According to experiments, it is preferable that the maximum diameter of the steel balls used is As shown in Figure 4, the opening inner diameter DO or the minimum radius Rf of the finished product should be twice (2・Rf) or less, and the opening inner diameter DO should be larger than twice the minimum radius Rf of the finished product (21a). Time (D.
〉2・Rf)、鋼球の最大径1)8は1.6・Rf(=
0.8X2・Rf)であった。この場合、装入する鋼球
の球径の分布は、最大域の球径を第1次球径D81とす
ると表1に示すごとく、第1次鋼球(2fia)より小
さい第2次鋼球(2Bb)および第3次鋼球(26c)
を混じた球形分布にし、この混合法を「1絞り素管(2
1)の内容積の約半分まで入れる。〉2・Rf), the maximum diameter of the steel ball 1)8 is 1.6・Rf(=
0.8×2·Rf). In this case, the distribution of the ball diameters of the steel balls to be charged is as shown in Table 1, assuming that the ball diameter in the maximum range is the primary ball diameter D81. (2Bb) and tertiary steel ball (26c)
A spherical distribution with a mixture of
Fill it to about half of the internal volume of 1).
この混合法を用いると、第5図に示すごとく、第1次鋼
球(2Ga)の接触部空間に第2次鋼球(26b)が入
り、さらに残った小さい空間に第3次鋼球(2Gc)が
入るため、拡管された素管と鋼球との接触が一様になり
、型彫り而の形杖に合致した形に精度良く拡管すること
ができる。When this mixing method is used, as shown in Fig. 5, the secondary steel ball (26b) enters the contact space of the primary steel ball (2Ga), and the tertiary steel ball (26b) enters the remaining small space. 2Gc), uniform contact between the expanded raw tube and the steel ball makes it possible to accurately expand the tube into a shape that matches the shape of the die carving.
表1 鋼球の適正球形分布
(発明の効果)
管材に引張り試験でえられる伸びの値以上に大きい加工
率の拡管加工をすることができる。Table 1 Appropriate spherical distribution of steel balls (effects of the invention) It is possible to expand a pipe material at a processing rate greater than the elongation value obtained in a tensile test.
液圧またはゴム圧を利用する従来拡管加工は、素管内に
導入された静水圧によって素管に一様な引張り歪みをり
・えて拡管する。金属材料に一様な引張り歪みをり、え
ていくと、ある歪みにおいてくびれが生じ、局部的に減
肉する。−112局部的減肉が生ずると、以後の歪みは
この減肉個所に集中するため、引張り試験でえられる伸
びの値よりはるかに小さい加工率(拡管率)で破壊する
。破壊する1)IIに加工をII二め、焼なましによっ
て拡管加工による加−1′、岐化を除去しても、すでに
局部的な減肉が生じているため、再度拡管加工しても早
期に破断し、焼なまし処理によって拡管率を高めること
はむつかしい。Conventional pipe expansion using hydraulic pressure or rubber pressure applies hydrostatic pressure introduced into the pipe to create a uniform tensile strain on the pipe to expand the pipe. When a metal material is subjected to a uniform tensile strain, it becomes constricted at a certain strain, resulting in local thinning. -112 When local thinning occurs, the subsequent strain concentrates on this thinning area, so the tube breaks at a processing rate (pipe expansion rate) that is much smaller than the elongation value obtained in the tensile test. Destruction 1) Processing to II II Second, even if the expansion process by annealing -1' and branching are removed, local thinning has already occurred, so even if the tube is expanded again. It breaks early and it is difficult to increase the tube expansion rate through annealing.
しかし、本発明の拡管加工は、口絞り素管内に鋼球を入
れて回転し、回転中に鋼球が落下して素管壁に当たった
ところを衝撃力によって延伸し、部分部分の延伸加工の
集積によって拡管加工するものであるため、局部的なく
びれが生ずることなく、引張り試験でえられる伸び程度
の大きな拡管率を1回の拡管加工でI−j、えることが
できる。さらに拡管側1−によって局部的くびれが生じ
ないため、焼なまし処理によって拡管加工による加工硬
化の効果を除くことにより、引続いて拡管加工すること
ができ、引張り試験における伸びの値より大きい、大き
な拡管率の加工をすることができる。However, in the tube expansion process of the present invention, a steel ball is placed in a mouth-drawn blank tube and rotated, and the part where the steel ball falls and hits the wall of the blank tube is stretched by impact force, and the partial portion is stretched. Since the tube is expanded by the accumulation of I-j, a large tube expansion rate equivalent to the elongation obtained in a tensile test can be obtained in one tube expansion without causing local constriction. Furthermore, since no local constriction occurs on the tube expansion side 1-, the work hardening effect caused by tube expansion is removed by annealing, and the tube can be expanded subsequently. It is possible to perform processing with a large tube expansion rate.
この特徴はA l 1Cuなど軟質の加工硬化しにくい
材料の拡管側−1−に適している。This feature is suitable for the tube expansion side -1- of soft materials that are difficult to work harden, such as Al 1Cu.
拡管加工に高度な技術を必要としない。液圧またはゴム
圧を利用する従来拡管加工は、適切な軸力を加えながら
適切な内圧を加えるように調整しなければならない。こ
の条件を填たすには事前に入念な調査をする必要がある
とともに、作業条件も厳密に管理しなければならない。No advanced technology is required for tube expansion. Conventional pipe expansion using hydraulic pressure or rubber pressure must be adjusted to apply appropriate internal pressure while applying appropriate axial force. In order to satisfy this condition, it is necessary to conduct careful research in advance, and the working conditions must also be strictly controlled.
また内圧のシール法に工夫が必要であり、加工中シール
不良が生ずると作業を中断しなければならない。In addition, it is necessary to devise a sealing method for internal pressure, and if a seal failure occurs during processing, the work must be interrupted.
しかし、本発明の加工法は口絞り素管内に適切な球径分
布をもった鋼球を入れて回転し、外形の変化をみながら
軸力を調整すれば良いので、拡管加工は極めて容易に行
うことができる。However, in the processing method of the present invention, steel balls with an appropriate diameter distribution are inserted into the blank pipe and rotated, and the axial force can be adjusted while observing changes in the external shape, so pipe expansion is extremely easy. It can be carried out.
拡管加工した成形品の内面が平滑である。The inner surface of the expanded molded product is smooth.
液圧またはゴム圧を使用した従来拡管用1−管材は、局
部的に生ずる軽度のくびれのため、内外面に凹凸が生ず
ることはさけられない。しかし、本発明の方法によって
成形した拡管材は、内面が鋼球によって打撃をうけるた
め、内面の細かい凹凸は打撃によってつぶされ平坦化し
、内面の・IL滑な拡管材かえられる。さらに拡管加工
後、細粒のグリッドを鋼球の代わりに拡管材の内に入れ
て回転させると、さらに内面の平滑な拡管材をうること
ができる。Conventional pipe materials for expanding pipes using hydraulic pressure or rubber pressure 1- cannot avoid unevenness on the inner and outer surfaces due to localized slight constrictions. However, since the inner surface of the tube expandable material formed by the method of the present invention is struck by the steel balls, fine irregularities on the inner surface are crushed and flattened by the blow, resulting in a smooth inner surface of the tube expandable material. Furthermore, after the tube expansion process, if a fine-grained grid is placed inside the tube expander instead of the steel ball and rotated, it is possible to obtain a tube expander with an even smoother inner surface.
第1図は本発明の一実施例構成を示す正面図、第2図は
第1図の所要部分断面側面図、第3図は拡管完了後の状
態を示す断面図、第4図(A)(B)は素管と鋼球径の
関係説明図、第5図は鋼球の働きを説明する図、第6図
および第7図は本発明の原理説明に用いる実験図である
。
第8図(A)(B)は従来のローラ加工による拡管法を
示す図、第9図は同じ〈従来のフリーバルジ加[−によ
る拡管法を示す図である。
<12)(+3)・・・ダイス、(14)(15)・・
・型彫り而、(18)・・・駆動軸、(20)・・・シ
リンダー、(21)・・・口絞り素管、(2[i)・・
・鋼球。
第1図
第4図(A) 第4図(8J第5図
第9図(A)
(力昧餡)
第9図(B)
へ
(カロエ4噴とりFig. 1 is a front view showing the configuration of an embodiment of the present invention, Fig. 2 is a cross-sectional side view of a necessary part of Fig. 1, Fig. 3 is a sectional view showing the state after pipe expansion is completed, Fig. 4 (A) (B) is an explanatory diagram of the relationship between the raw pipe and the steel ball diameter, FIG. 5 is an explanatory diagram of the function of the steel ball, and FIGS. 6 and 7 are experimental diagrams used to explain the principle of the present invention. FIGS. 8A and 8B are diagrams showing a conventional tube expansion method using roller processing, and FIG. 9 is a diagram showing the same (conventional tube expansion method using free bulging). <12) (+3)... Dice, (14) (15)...
・Die engraving, (18)...Drive shaft, (20)...Cylinder, (21)...Diaper tube, (2[i)...
·wrecking ball. Figure 1 Figure 4 (A) Figure 4 (8J Figure 5 Figure 9 (A) (Rikimai-an) Figure 9 (B) To (Kaloe 4 squirts)
Claims (2)
ダイス内に、予め口絞りした素管をセットし、該素管内
に適切な球径分布をもった鋼球を多数個収容した状態か
ら、上記一対のダイスを相対的に接近移動させつつ回転
させて、上記素管を圧縮すると同時に、該素管内の鋼球
を上記回転によって素管内面を衝撃させ、しかして該素
管を上記型彫り面に倣って膨出させる拡管ボール加工法
。(1) A pre-drawn blank tube was set in a pair of dies each having a carved surface on opposing surfaces, and a large number of steel balls with an appropriate spherical diameter distribution were housed in the blank tube. From this state, the pair of dies are rotated while moving relatively close to each other to compress the raw pipe, and at the same time, the steel balls in the raw pipe are caused to impact the inner surface of the raw pipe by the rotation, thereby compressing the raw pipe. A tube expansion ball machining method that bulges out following the die-sinking surface described above.
持された一対のダイスと、両ダイス内にわたってセット
された口絞り素管と、この素管内に収容された多数個の
鋼球と、上記両ダイスを相対的に近接移動させるシリン
ダ、および両ダイスの回転駆動機構を備えた拡管ボール
加工装置。(2) A pair of dies that are held opposite each other and have die-scaved surfaces on opposing surfaces, a mouth-drawn blank tube set across both dies, and a large number of steel balls housed in this blank tube. and a cylinder for moving the two dies relatively close to each other, and a rotation drive mechanism for the two dies.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7632486A JPS62230433A (en) | 1986-04-01 | 1986-04-01 | Pipe expansion ball working method and its device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7632486A JPS62230433A (en) | 1986-04-01 | 1986-04-01 | Pipe expansion ball working method and its device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS62230433A true JPS62230433A (en) | 1987-10-09 |
Family
ID=13602181
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7632486A Pending JPS62230433A (en) | 1986-04-01 | 1986-04-01 | Pipe expansion ball working method and its device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS62230433A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20010066974A (en) * | 2000-08-10 | 2001-07-12 | 지정철 | A street lamp pole manufacture device and manufacture method |
JP2010255649A (en) * | 2009-04-21 | 2010-11-11 | Nippon Kyohan Kogyo Co Ltd | Expansion joint and method of manufacturing the same |
-
1986
- 1986-04-01 JP JP7632486A patent/JPS62230433A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20010066974A (en) * | 2000-08-10 | 2001-07-12 | 지정철 | A street lamp pole manufacture device and manufacture method |
JP2010255649A (en) * | 2009-04-21 | 2010-11-11 | Nippon Kyohan Kogyo Co Ltd | Expansion joint and method of manufacturing the same |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
Ahmed et al. | Estimation of machine parameters for hydraulic bulge forming of tubular components | |
US3292414A (en) | Apparatus for localized swaging of pipes | |
JPH1147842A (en) | Liquid pressure bulging method and liquid pressure bulging device for metallic tube | |
GB2057322A (en) | Process and apparatus for the formation of hollow objects having varying cross section | |
US3570297A (en) | Die and method for drawing metal tubes | |
CA2363069A1 (en) | Compressive hydroforming | |
JPS5838256B2 (en) | Manufacturing method for automotive axle housings | |
JPS62230433A (en) | Pipe expansion ball working method and its device | |
EP0028653B1 (en) | Tubular cast piece inner surface working apparatus | |
JPH10175027A (en) | Metallic tube for hydro-form | |
JP3351331B2 (en) | A method of manufacturing a deformed metal tube and a method of manufacturing a bent metal tube. | |
DE3910192C2 (en) | Process for the production of compressed gas cylinders made of steel | |
JP3794680B2 (en) | Hydroforming method | |
JP3331499B2 (en) | Bush processing method | |
Thiruvarudchelvan et al. | Tube bulging with a urethane rod | |
US3580038A (en) | Extrusion mandrel and method | |
JPH0659503B2 (en) | Stepped tube / tapered tube manufacturing method | |
JP4280393B2 (en) | Thin wall bulge processing method | |
KR840001336B1 (en) | Method for working the inner surface of tubular cast pieces | |
JP2001071069A (en) | Manufacture of flexible pipe, and manufacturing device | |
JPS59113935A (en) | Press forming method | |
JPH05228570A (en) | Cold roll forming method for ring body of bearing | |
SU727268A1 (en) | Tube bending method | |
JPS5952006B2 (en) | How to mold a bicycle head drag | |
JPS5927661B2 (en) | Bending method for tapered pipe |