JPH0413509A - Cutting device for edge preparation machine - Google Patents

Cutting device for edge preparation machine

Info

Publication number
JPH0413509A
JPH0413509A JP11217290A JP11217290A JPH0413509A JP H0413509 A JPH0413509 A JP H0413509A JP 11217290 A JP11217290 A JP 11217290A JP 11217290 A JP11217290 A JP 11217290A JP H0413509 A JPH0413509 A JP H0413509A
Authority
JP
Japan
Prior art keywords
cutter
rails
cutting
cutting position
workpiece
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
Application number
JP11217290A
Other languages
Japanese (ja)
Inventor
Toshio Okazaki
寿男 岡崎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shinko Electric Industries Co Ltd
Sinko Industries Ltd
Original Assignee
Shinko Electric Industries Co Ltd
Sinko Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Shinko Electric Industries Co Ltd, Sinko Industries Ltd filed Critical Shinko Electric Industries Co Ltd
Priority to JP11217290A priority Critical patent/JPH0413509A/en
Publication of JPH0413509A publication Critical patent/JPH0413509A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To make the whole constitution compact and improve the cutting precision by providing a rail supporting body provided integrally with a table with a pair of an upper and a lower rails parallel to each other one of which is put close to a cutting position and the other of which is put apart, and engaging a movable base with them. CONSTITUTION:A cutting position of a cutter 24 can be set by an inclination adjustment by a rotary table 19, a Y-direction forward/back adjustment for a movable table 14, and a Z-direction vertical adjustment for an elevation table 11, and by running a movable base 5 along rails 3a, 3b, edge preparation work is applied to a work W. The rails 3a, 3b are disposed close to the cutting position, and a rotary cutter 24 and its holding mechanism are disposed close to their support part, generating only a small overhang which is advantageous for rigidity. Because the rails 3a, 3b are not existing under the rotary table 19 or the elevation table 11, the inclination range of the cutter 24 can be set large as it is not prohibited by them.

Description

【発明の詳細な説明】 (産業上の利用分野) この発明は、レールの配設関係を工夫することによって
全体装置の剛性化、コンパクト化を図った開先加工機の
切削装置に関するものである。
[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a cutting device for a beveling machine in which the overall device is made more rigid and compact by devising the arrangement of rails. .

(従来の技術) 溶接加工を行う上で部材への開先加工は不可欠な要素と
なっており、近年、健全な溶接品質を確保する目的で開
先部の形成をカッター削りで行う場合が多くなってきて
いる。
(Conventional technology) Creating a groove in a member is an essential element in welding, and in recent years, the groove is often formed using a cutter to ensure sound welding quality. It has become to.

二枚のプレート部材などを溶接する場合においては、加
工材Wの接合端に例えば、第5図のようにし形開先加工
が行われているが、この加工は第4図に示すような加工
機で行われる。
When welding two plate members, etc., the joint end of the workpiece W is machined with a bevel as shown in Fig. 5, for example; It is done on a machine.

この従来の加工機を使用方法と共に説明する。This conventional processing machine will be explained along with how to use it.

まず、テーブル1′端にある定規板2′を図のようにテ
ーブル1′上に突出させ、この定規板2′に端部を当接
して加工材Wを供給する。そして、この状態において油
圧シリンダ3′を作動し、加工材Wをテーブル上にクラ
ンプ固定する。定規板2′は上記のクランプ動作後にお
いてテーブル面の下方に没入させておく。
First, a ruler plate 2' at the end of the table 1' is projected onto the table 1' as shown in the figure, and the workpiece W is supplied by touching the edge of the ruler plate 2' to the ruler plate 2'. In this state, the hydraulic cylinder 3' is operated to clamp and fix the workpiece W on the table. The ruler plate 2' is retracted below the table surface after the above-mentioned clamping operation.

続いて、切削装置側において第1のモータ4′を駆動し
てカッターユニット5′を傾斜調整し、回転カッター6
′を所望の開先角度に設定し、次いで第2のモータ7′
を駆動して往復台8′を加工材W側に向って前進移動す
る。この往復台8′の移動量は、カッター6′に対応す
る開先量設定治具(図示省略)によって適宜に設定する
Next, the first motor 4' is driven on the cutting device side to adjust the inclination of the cutter unit 5', and the rotary cutter 6 is rotated.
' to the desired bevel angle, and then the second motor 7'
is driven to move the carriage 8' forward toward the workpiece W side. The amount of movement of the carriage 8' is appropriately set by a groove setting jig (not shown) corresponding to the cutter 6'.

上記のようにして加工材Wに対するカッター6′の切り
込み位置が決定しなならば、モータ9′により切削送り
手段10′を駆動し、移動ベース11′を摺動ガイド1
2’、12’方向に走行移動する。
If the cutting position of the cutter 6' on the workpiece W is not determined as described above, the cutting feed means 10' is driven by the motor 9', and the movable base 11' is moved to the sliding guide 1.
Travels in the 2' and 12' directions.

これにより、加工材Wの端面部に第5図に示したような
所要の開先加工を行うことができる。
Thereby, the required beveling process as shown in FIG. 5 can be performed on the end face portion of the workpiece W.

ここで、上記の切削加工を行うに当たっての重要な部分
がカッター6′を備えたカッターユニット5′さらには
このサポート機構であり、以下この構成を説明する。
Here, the important parts in carrying out the above-mentioned cutting process are the cutter unit 5' including the cutter 6' and the support mechanism thereof, and this structure will be explained below.

同図において13′はベース 14′はベース13′上
にしてテーブル1′の後側に配設した水平ベツドで、こ
の水平ベツド14′の上部に前記した左右一対の摺動ガ
イド12′、12′を配設する。そして、この摺動ガイ
ド12′、12′に移動ベース11′を介して往復台8
′を設け、さらに往復台8′に角度変更機構15′を介
してカッターユニット5′を搭載する。
In the same figure, 13' is a base, and 14' is a horizontal bed disposed on the base 13' and behind the table 1'.A pair of left and right sliding guides 12', 12' are provided above the horizontal bed 14'. ′ is placed. The carriage 8 is connected to the sliding guides 12', 12' via the moving base 11'.
Furthermore, a cutter unit 5' is mounted on the carriage 8' via an angle changing mechanism 15'.

上記の角度変更機構15′は、往復台8′上に固定した
円弧状のギヤ16′と、このギヤ16′に噛み合うピニ
オンギヤ17′、円弧状ギヤ16′の中心位置に設けた
カッターユニット5′の回動支軸18′およびピニオン
ギヤ17′を駆動する前記モータ4′によって構成され
ている。
The above angle changing mechanism 15' consists of an arc-shaped gear 16' fixed on the carriage 8', a pinion gear 17' that meshes with this gear 16', and a cutter unit 5' provided at the center of the arc-shaped gear 16'. The motor 4' drives the rotation support shaft 18' and the pinion gear 17'.

(発明が解決しようとする課題) 上記のように従来の加工機においては、各機構を段積み
状に配設した上でカッターユニット5′を装備してあり
、カッタ−6′位置とテーブル端の加工材W位置の整合
性を保持するためには、上記の両者と摺動ガイド12′
42′の距離を遠く離隔しなければならず、また、テー
ブル1′と摺動ガイド12’、12’とを前後に分けて
別体で構成しなければならない。
(Problems to be Solved by the Invention) As mentioned above, in the conventional processing machine, each mechanism is arranged in a stacked manner and is equipped with a cutter unit 5', and the cutter 6' position and table end In order to maintain the consistency of the position of the workpiece W, both of the above and the sliding guide 12'
42', and the table 1' and the sliding guides 12', 12' must be separated into front and rear parts and constructed separately.

従って、摺動ガイド12′、12′に対するカッターユ
ニット5′のオーバーハングが大きく、重切削時にビビ
リを生ずるという難点があり、これを解決するには剛性
をもって大形化して当たらなければならないという構成
上の問題点がある。才な、テーブルとベツドとの別体化
は、個々に構造強度が要るので大形化を招き、当然加工
精度、組付は精度が厳しくなるという問題点を生ずる。
Therefore, there is a large overhang of the cutter unit 5' with respect to the sliding guides 12', 12', which causes chatter during heavy cutting.To solve this problem, the structure must be made large and rigid. There is a problem with the above. However, separating the table and bed into separate units requires structural strength for each member, which leads to an increase in size, and of course creates the problem that processing accuracy and assembly accuracy become stricter.

本発明は、上記した従来装置の問題点に着目してなされ
たもので、テーブルとレールとを一体的にして接近する
ことによって全体構成のコンパクト化、切削精度の向上
ができる開先加工機の切削装置を提供しようとするもの
である。
The present invention has been made by focusing on the problems of the conventional device described above, and is a beveling machine that can compact the overall configuration and improve cutting accuracy by integrating the table and rail and approaching them together. The present invention aims to provide a cutting device.

(課題を解決するための手段) 上記の目的を達成するために、この発明に係る開先加工
機の切削装置は、次のように構成したものである。
(Means for Solving the Problems) In order to achieve the above object, a cutting device for a beveling machine according to the present invention is configured as follows.

すなわち、この発明の要旨とするところは、押え部材に
よってテーブル上に加工材を押圧固定し、この加工材を
テーブル端後方に位置して回転するカッターの走行移動
によって切削する加工機において、 上記テーブルの裏面側に、このテーブルと一体的にレー
ル支持体を設けて、このレール支持体に、一方を前記カ
ッターの切削位置に接近させ、他方を切削位置から離隔
した上下一対の平行レールを配設し、これら平行レール
にカッターを保持する移動ベースを走行自在に係合した
ことにある。
That is, the gist of the present invention is to provide a processing machine that presses and fixes a workpiece onto a table using a presser member, and cuts the workpiece by the traveling movement of a rotating cutter located behind the table end. A rail support body is provided integrally with the table on the back side of the table, and a pair of upper and lower parallel rails are disposed on this rail support body, one of which is close to the cutting position of the cutter, and the other is separated from the cutting position. The movable base that holds the cutter is movably engaged with these parallel rails.

(作 用) テーブルの裏面側に上下一対のレールを配設したので、
加工材の切削位置とレールによる移動ベースの支承位置
とを接近することができる。また、レールとカッターと
の位置も接近するので、各構成部材間のオーバーハング
が小さく剛性強度が増大する。さらに、レールとテーブ
ル一体止することにより:合理的にレール強度を確保す
ることができ、コンパクトな組込みができる。
(Function) Since a pair of upper and lower rails are provided on the back side of the table,
The cutting position of the workpiece and the supporting position of the moving base by the rail can be brought close to each other. Furthermore, since the rail and cutter are positioned close to each other, overhang between each component is small and rigidity is increased. Furthermore, by integrally fixing the rail and table, the rail strength can be reasonably ensured and compact installation is possible.

(実施例) 以下、本発明に係る開先加工機の切削装置を一実施例に
ついて具体的に説明する。
(Example) Hereinafter, one example of the cutting device of the beveling machine according to the present invention will be specifically described.

第1図は縦断側面図 第2図は平面図を示すもので、1
は上部に水平のテーブル2を形成したベース 3aおよ
び3bはベース1の後側に支持体4・・・を介して取り
付けた上下一対の水平レール上記上部のレール3aは可
及的にテーブル2に接近して配設し、下部の水平レール
3bはテーブル面から適宜に離隔して配設する。また、
上記の支持体4・・・は第3図に示すように立置状に間
隔的に配設するもので、ベース1と水平レール3a、3
bとの間には僅かな隙間Aを形成する。
Figure 1 shows a vertical side view. Figure 2 shows a plan view.
is a base on which a horizontal table 2 is formed; 3a and 3b are a pair of upper and lower horizontal rails attached to the rear side of the base 1 via supports 4; the upper rail 3a is attached to the table 2 as much as possible; The lower horizontal rails 3b are arranged at an appropriate distance from the table surface. Also,
The above-mentioned supports 4... are arranged vertically at intervals as shown in FIG.
A slight gap A is formed between it and b.

5は摺動メタル6.6を介してレール3a、3bに走行
自在に係合した移動ベース 7は移動ベース6に固定し
た受動ナツトで、この受動ナツト7にレール方向の送り
ねじ軸8を螺合する。上記の送りねじ軸8は図示省略の
モータによって正逆駆動され、移動ベース5をレール方
向に走行移動する。
Reference numeral 5 denotes a movable base that is movably engaged with the rails 3a and 3b via sliding metals 6.6.7 is a passive nut fixed to the movable base 6, into which the feed screw shaft 8 in the rail direction is screwed. match. The feed screw shaft 8 is driven forward and backward by a motor (not shown), and travels along the movable base 5 in the rail direction.

次に9は移動ベース5の後部に樹立して設けた取付フレ
ーム 10は取付フレーム9に設けた昇降ガイド 11
は昇降ガイド10に係合した昇降台 上記の取付フレー
ムつと昇降台11の間には周知の送りねじ軸と受動ナツ
トによる送り手段(図示省略)が装備されており、この
送り手段に連係したモータ12によって昇降台11は図
のZ矢印で示す上下に位置調整される。
Next, reference numeral 9 indicates a mounting frame installed at the rear of the movable base 5. Reference numeral 10 indicates a lifting guide 11 provided on the mounting frame 9.
is a lifting platform engaged with the lifting guide 10. Between the above-mentioned mounting frame and the lifting table 11, a well-known feeding means (not shown) consisting of a feed screw shaft and a passive nut is installed, and a motor linked to this feeding means. 12, the position of the lifting platform 11 is adjusted vertically as indicated by the Z arrow in the figure.

13は昇降台11に設けた前後ガイド 14は前後ガイ
ド13に係合した進退台 上記の昇降台11と進退台1
4との間には前記同様の周知の送り手段(図示省略)が
備えられており、この送り手段に連係したモータ15に
よって進退台14は図のY矢印で示す前後方向に位置調
整される。
Reference numeral 13 indicates a front and rear guide provided on the lifting platform 11. 14 indicates an advancing/retracting platform engaged with the longitudinal guide 13. The above-mentioned elevator platform 11 and advancing/retracting platform 1
4 is provided with a known feeding means (not shown) similar to that described above, and the position of the advancing/retracting table 14 is adjusted in the front-rear direction indicated by the Y arrow in the figure by a motor 15 linked to this feeding means.

16は進退台14の側面部に固定した扇形のギヤ17は
扇形ギヤ16の外周に設けた円弧ガイド 18は扇形ギ
ヤ16の中心位置に設けた水平支軸 19は一端を水平
支軸18に枢着し、他端を円弧ガイド17に係合した回
動台、上記の回動台19には扇形ギヤ16に噛み合うウ
オームギヤ20が取りつけられ、このウオームギヤ20
に連係したモータ21により回動台19は図のR矢印方
向に回動調整される。
16 is a fan-shaped gear 17 fixed to the side surface of the forward/retreat table 14 is an arcuate guide provided on the outer periphery of the fan-shaped gear 16. 18 is a horizontal support shaft provided at the center of the fan-shaped gear 16. 19 has one end pivoted to the horizontal support shaft 18. The rotary base 19 is attached to the rotary base and has its other end engaged with the arcuate guide 17. A worm gear 20 that meshes with the fan-shaped gear 16 is attached to the rotary base 19, and the worm gear 20
The rotary table 19 is rotated in the direction of the arrow R in the figure by the motor 21 linked to the rotary table 19 .

22は上記の回動台19に一体的に設けた軸受筒で、内
部に前記扇形ギヤ16の中心線方向と平行するスピンド
ル23を設ける。24はスピンドル23の一端に取り付
けた回転カッター この回転カッター24の切削面aは
前記した扇形ギヤ16の中心より僅かにテーブル側へ突
出している。25は適宜の伝導手段を介してスピンドル
23に連係した主軸モータである。
Reference numeral 22 denotes a bearing cylinder provided integrally with the rotating table 19, and a spindle 23 parallel to the direction of the center line of the sector gear 16 is provided inside. A rotary cutter 24 is attached to one end of the spindle 23. A cutting surface a of the rotary cutter 24 slightly protrudes toward the table from the center of the fan-shaped gear 16 described above. 25 is a main shaft motor linked to the spindle 23 via suitable transmission means.

次に26.26はベース1と水平レール3a、3bの間
の隙間Aに上向きに配設した油圧シリンダ 27は油圧
シリンダ26のピストンロッド端に取り付けた当接定規
板 上記当接定規板27はピストンロッドの伸長作動時
にテーブル2の後端に臨むように突出し、また、収縮作
動時に上記の隙間Aに位置するように没入する。
Next, 26. 26 is a hydraulic cylinder arranged upward in the gap A between the base 1 and the horizontal rails 3a and 3b. 27 is an abutment ruler plate attached to the piston rod end of the hydraulic cylinder 26. The abutment ruler plate 27 is When the piston rod is extended, it protrudes to face the rear end of the table 2, and when it is retracted, it retracts to be located in the gap A.

28・・・は当接定規板27の出没動作を案内する昇降
ガイド 29はテーブル2上に加工材Wをクランプ固定
するクランプ爪で、下向きの油圧シリンダ30によって
作動される。
28 is a lifting guide that guides the protruding and retracting movement of the contact ruler plate 27. 29 is a clamp claw that clamps and fixes the workpiece W on the table 2, and is operated by a downward hydraulic cylinder 30.

一実施例に傷る開先加工機の切削装置の構成は上記の通
りであるので、テーブル2への加工材Wの取りつけは従
来例と同様に行うことができる。
Since the configuration of the cutting device of the beveling machine in one embodiment is as described above, the workpiece W can be attached to the table 2 in the same manner as in the conventional example.

また、カッター24の切り込み位置設定は、回動台19
のR方向の傾斜調整、進退台14のY方向の前後調整お
よび昇降台11の2方向の上下調整によって適宜に行う
ことができる。そして、上記の加工材Wと回転カッター
24の設定状態において移動ベース5をレール3a、3
b方向に走行駆動すれば、加工材Wの端部に所要の開先
加工を行うことができる。
In addition, the cutting position of the cutter 24 can be set using the rotary table 19.
This can be done as appropriate by adjusting the inclination in the R direction, adjusting the forward/backward movement table 14 back and forth in the Y direction, and adjusting the lifting table 11 up and down in two directions. Then, in the setting state of the workpiece W and the rotary cutter 24, the movable base 5 is moved to the rails 3a and 3.
By driving in the b direction, the required beveling process can be performed on the end of the workpiece W.

上記の切削加工状態において、レール3a、3bは切削
位置に接近して配設されており、また、レール3a、3
bの支承部に接近して回転カッター24およびこの保持
機構が配設されているので、オーバーハングが小さく、
剛性面で有利である。
In the above cutting state, the rails 3a, 3b are arranged close to the cutting position, and the rails 3a, 3b are arranged close to the cutting position.
Since the rotary cutter 24 and its holding mechanism are arranged close to the support part b, the overhang is small.
It is advantageous in terms of rigidity.

また、この一実施例においては、回動台19、昇降台1
1の下方にレール3a、3bが存在しないので、これに
邪魔されずにカッター24の傾動範囲を大きく設定する
ことができる。具体的には、スピンドル23を上向き傾
斜にも下向き傾斜にも設定することができる。
In addition, in this embodiment, the rotating table 19, the lifting table 1
Since the rails 3a and 3b do not exist below the cutter 24, the tilting range of the cutter 24 can be set to a large extent without being hindered by the rails 3a and 3b. Specifically, the spindle 23 can be set either upwardly or downwardly.

従って、例えば切削装置を走行方向に二基連設しておき
、そのカッターをそれぞれ前記のように上向きと下向き
に設定すれば、−工程でに形開先加工を行うことができ
る。また、上記力・ンターを同じ向きにして互いのカッ
ターにそれぞれ切削加工量の半分づつを分担させれば、
切削送り速度を増大して加工能率の向上を図ることもで
きる。
Therefore, for example, if two cutting devices are arranged in series in the running direction and the cutters are set upward and downward as described above, shape bevel processing can be performed in the -step. Also, if the above-mentioned force and torque are directed in the same direction and each cutter is made to share half of the cutting amount,
It is also possible to improve machining efficiency by increasing the cutting feed rate.

(発明の効果) 以上のように本発明の切削装置によれば、テーブルとレ
ールとを一体的に構成したので、両者が接近するばかり
でなくカッターの切削位置と移動ベースの支承位置を接
近することができる。このため、構成のコンパクト化を
達成することができる。また、オーバーハングか小さく
カッターの保持剛性が向上するので、切削時のヒビリな
ども解消することができる。
(Effects of the Invention) As described above, according to the cutting device of the present invention, since the table and the rail are integrally configured, not only are they close to each other, but the cutting position of the cutter and the support position of the movable base are also close to each other. be able to. Therefore, the configuration can be made more compact. In addition, the overhang is small and the rigidity of holding the cutter is improved, so it is possible to eliminate cracks during cutting.

【図面の簡単な説明】[Brief explanation of the drawing]

図面は、本発明に係る開先加工機の切削装置の一実施例
を示すもので、第1図は縦断側面図 第2図は平面図 
第3図はレールの取付状態を示す背面図 第4図は従来
の開先加工機の説明図 第5図は開先形状の一例を示す
説明図である。 1:ベース     2;テーブル 3a、3b:レール  4:支持体 5コ移動ベース   8:送りねじ軸 9、取付フレーム  11.昇降台 14・進退台     16・扇形ギヤ18:水平支軸
    19:回動台 22:軸受筒     23ニスピンドル24:回転カ
ッター  25;駆動モータ26:油圧シリンダ  2
7:当接定規板29:クランプ爪   W 加工材 a:切削面 A:隙 間
The drawings show an embodiment of the cutting device of the beveling machine according to the present invention, and FIG. 1 is a vertical side view and FIG. 2 is a plan view.
FIG. 3 is a rear view showing how the rail is attached. FIG. 4 is an explanatory diagram of a conventional beveling machine. FIG. 5 is an explanatory diagram showing an example of a beveling shape. 1: Base 2; Tables 3a, 3b: Rails 4: Moving base for 5 supports 8: Feed screw shaft 9, mounting frame 11. Lifting table 14, advance/retreat table 16, sector gear 18: Horizontal support shaft 19: Rotating table 22: Bearing tube 23 Nissin spindle 24: Rotating cutter 25; Drive motor 26: Hydraulic cylinder 2
7: Contact ruler plate 29: Clamp claw W Workpiece a: Cutting surface A: Gap

Claims (1)

【特許請求の範囲】 押え部材によってテーブル上に加工材を押圧固定し、こ
の加工材をテーブル端後方に位置して回転するカッター
の走行移動によって切削する加工機において、 上記テーブルの裏面側に、このテーブルと一体的にレー
ル支持体を設けて、このレール支持体に、一方を前記カ
ッターの切削位置に接近させ、他方を切削位置から離隔
した上下一対の平行レールを配設し、これら平行レール
にカッターを保持する移動ベースを走行自在に係合した
ことを特徴とする開先加工機の切削装置。
[Scope of Claims] A processing machine that presses and fixes a workpiece on a table with a presser member, and cuts the workpiece by the traveling movement of a rotating cutter located behind the table end, which includes: on the back side of the table; A rail support is provided integrally with the table, and a pair of upper and lower parallel rails are disposed on the rail support, one of which is close to the cutting position of the cutter and the other is spaced apart from the cutting position. A cutting device for a beveling machine, characterized in that a movable base that holds a cutter is engaged in a movable manner.
JP11217290A 1990-04-28 1990-04-28 Cutting device for edge preparation machine Pending JPH0413509A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11217290A JPH0413509A (en) 1990-04-28 1990-04-28 Cutting device for edge preparation machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11217290A JPH0413509A (en) 1990-04-28 1990-04-28 Cutting device for edge preparation machine

Publications (1)

Publication Number Publication Date
JPH0413509A true JPH0413509A (en) 1992-01-17

Family

ID=14580054

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11217290A Pending JPH0413509A (en) 1990-04-28 1990-04-28 Cutting device for edge preparation machine

Country Status (1)

Country Link
JP (1) JPH0413509A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5173172A (en) * 1991-08-19 1992-12-22 Exxon Research And Engineering Company Production of hard asphalts by ultrafiltration of vacuum residua

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5173172A (en) * 1991-08-19 1992-12-22 Exxon Research And Engineering Company Production of hard asphalts by ultrafiltration of vacuum residua

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