JPH0295521A - Processing method of large size inner gear - Google Patents
Processing method of large size inner gearInfo
- Publication number
- JPH0295521A JPH0295521A JP24101388A JP24101388A JPH0295521A JP H0295521 A JPH0295521 A JP H0295521A JP 24101388 A JP24101388 A JP 24101388A JP 24101388 A JP24101388 A JP 24101388A JP H0295521 A JPH0295521 A JP H0295521A
- Authority
- JP
- Japan
- Prior art keywords
- upper punch
- long strip
- strip material
- inner gear
- roll
- 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
- 238000003672 processing method Methods 0.000 title claims description 3
- 239000000463 material Substances 0.000 claims abstract description 34
- 238000005452 bending Methods 0.000 claims abstract description 15
- 238000003825 pressing Methods 0.000 claims description 12
- 238000005520 cutting process Methods 0.000 claims description 11
- 238000003466 welding Methods 0.000 claims description 5
- 230000000630 rising effect Effects 0.000 claims 1
- 238000003754 machining Methods 0.000 abstract description 6
- 239000002994 raw material Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- OWNRRUFOJXFKCU-UHFFFAOYSA-N Bromadiolone Chemical compound C=1C=C(C=2C=CC(Br)=CC=2)C=CC=1C(O)CC(C=1C(OC2=CC=CC=C2C=1O)=O)C1=CC=CC=C1 OWNRRUFOJXFKCU-UHFFFAOYSA-N 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
Landscapes
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は内歯車の加工に係わり、特に大形の内歯車の素
形材加工に好適な鍛造加工方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to the processing of internal gears, and particularly to a forging method suitable for processing large-sized internal gears.
従来、小さい内歯車の加工は、旋盤等によりリング状素
材を加工し、ピニオンカッタ切り等で歯切する。切削加
工を主体とした加工方法がとられていた。そのため、材
料歩留は悪く、多大の加工時間を要していた。Conventionally, small internal gears are processed by processing a ring-shaped material using a lathe or the like, and cutting the gears using a pinion cutter or the like. The processing method used was mainly cutting. Therefore, the material yield was poor and a large amount of processing time was required.
また、長尺帯状品をロール加工あるいはプレスによる０
０曲げ加工によってリング状にし、溶接で接合する方法
でリング状素材を加工することも考えられるが、歯切り
加工では前記の場合と同様に多大の加工時間を要すると
考えられる。さらに、ロール加工の場合は専用機、プレ
ス加工の場合はリングの径に応じた金型が必要となり、
すべてを切削する方法と比較しても、低コストとはなら
ない。In addition, long strip products can be rolled or pressed to produce zero
It is conceivable to process the ring-shaped material by a method of making it into a ring shape by zero-bending and joining it by welding, but it is thought that the gear cutting process would require a large amount of processing time as in the above case. Furthermore, roll processing requires a special machine, and press processing requires a mold that matches the diameter of the ring.
Even compared to the method of cutting everything, it is not low cost.
なお、内歯車の切削に関する文献として、［歯車便覧」
日刊工業及び実用機械技術全書「機械工作法下巻」西彪
男著 槙書店が挙げられる。In addition, as a document regarding cutting of internal gears, please refer to [Gear Handbook]
Nikkan Kogyo and Practical Mechanical Technology Complete Book ``Machine Work Law Vol. 2'' by Nishi Biao, Maki Shoten.
上記従来技術では、鍛造加工されている加工数量の多い
小形の内歯車以外は、材料歩留り、加工時間の点で問題
があり、特に大形の内歯車の加工ではそれらの問題点が
顕著であった。With the above-mentioned conventional technology, there are problems in terms of material yield and machining time, except for small internal gears that are forged in large quantities, and these problems are particularly noticeable when machining large internal gears. Ta.
本発明の目的は、大形内歯車の加工において、上記した
従来技術の問題点を除去し、既存のプレス、溶接、切削
加工を組合せた低コストな大形内歯車を供給することが
できる加工法のうち、特に既存のプレスを用いた素形材
加工法を提供することにある。The purpose of the present invention is to eliminate the problems of the above-mentioned conventional techniques in the processing of large internal gears, and to provide a process that can provide low-cost large internal gears by combining existing pressing, welding, and cutting processes. Among the methods, the object of the present invention is particularly to provide a method for processing formed materials using an existing press.
上ポンチを、一方をとりはずすことが出来るホルダによ
り両サイトからサポートされた、内歯車加工用素材であ
る長尺帯状品の板幅より長くかつ内歯車の歯部を成形す
る突起部を有するとともに内歯車の内径より十分小さい
外径の円柱とし、下型を、幅方向°加圧部長さが前記長
尺帯状品の板幅よりも長く、かつ前記上ポンチの突起部
の長手方向加圧部長さよりも長い長手方向加圧部長さの
加圧面を有する下型とし、前記上ポンチと下型の間に挿
入した前記長尺帯状品を内歯車の歯部ピッチに相当する
送りピッチで間欠的に移動しながら、前記長尺帯状品の
板幅の全長を歯部高さが形成される圧縮量で、所定の全
加圧長さにわたり順次加圧する際に、該長尺帯状品の送
り方向側に設け。The upper punch is supported from both sites by a holder from which one side can be removed, and has a protrusion that is longer than the width of the long strip of material for machining internal gears and that forms the teeth of the internal gear. The lower mold is made of a cylinder having an outer diameter sufficiently smaller than the inner diameter of the gear, and the lower mold is made such that the pressing part in the width direction is longer than the plate width of the long strip product and the length of the pressing part in the longitudinal direction of the protrusion of the upper punch is longer. A lower mold having a pressing surface with a long longitudinal pressing part length is used, and the long strip-shaped product inserted between the upper punch and the lower mold is moved intermittently at a feed pitch corresponding to the tooth pitch of the internal gear. At the same time, when the entire length of the plate width of the long strip-shaped product is compressed by the amount of compression that forms the height of the tooth part over a predetermined total pressurizing length, Provided.
上ポンチが所定の下死点に達した時に所定位置に上昇し
、上ポンチの上昇と同時に所定位置へ下降することが出
来るロールとロールホルダから構成された曲げ拘束装置
を用い、該長尺帯状品の凸部の曲がり量が内歯車の外径
の円弧と等しくなるように制御することにより、内径側
に歯部が形成されたリング状品を成形し、その両端部を
溶接等で接合した内歯車加工用の素形材を切削により仕
上げ加工することにより、前記問題点が解決される。Using a bending restraint device consisting of a roll and a roll holder that can rise to a predetermined position when the upper punch reaches a predetermined bottom dead center and lower to a predetermined position at the same time as the upper punch rises, the long strip By controlling the amount of bending of the convex part of the product to be equal to the arc of the outer diameter of the internal gear, a ring-shaped product with teeth formed on the inner diameter side was formed, and both ends were joined by welding etc. The above-mentioned problems can be solved by finishing the material for internal gear machining by cutting.
上ポンチを、内歯車の歯部を成形する突起部を設けた円
柱とし、一方をとりはずすことができるホルダにより両
サイドからサポートする構造としたため、長尺帯状素材
をリング状に成形できる。The upper punch is a cylinder with protrusions that form the teeth of the internal gear, and one of the punches is supported from both sides by a removable holder, so a long strip material can be formed into a ring shape.
また、上ポンチが所定の下死点に達すると同時に、所定
位置に上昇する曲げ拘束装置により１両者の相対位置か
ら決定される幾可学的関係により、内歯車素形材の外径
を定めることができる。In addition, when the upper punch reaches a predetermined bottom dead center, the bending restraint device that rises to a predetermined position determines the outer diameter of the internal gear material based on the geometric relationship determined from the relative position of the two. be able to.
以下、本発明の実施例を図により説明する。まず、第１
図は本発明の構成を示す０本発明は厚さａｌが長尺帯状
素材１の板幅Ｗより長く、所定のモジール形状を有する
歯加工部２Ａを有する半径Ｒｐの円柱状の上ポンチ２と
、これを両サイドからサポートしかつ一方が前記上ポン
チの連結部２Ｂから着脱可能なポンチホルダ６Ａ、６Ｂ
と１幅方向加圧部長さａ２が前記長尺帯状素材１の板幅
よりも長く、且つ、長手方向加圧部長さａ、が、歯加工
部の長手力向長さより十分長い加圧面３Ａを有する下型
と、下型３の長尺帯状素材１の送り方向側に設置し、上
ポンチ２の上昇、下降と同期して、下降、上昇すること
が出来るロールホルダ５とロール４から成る曲げ拘束装
置から構成されている。第２図は第１図の側面図である
。上ポンチ２が所定の下死点に達し、且つ曲げ拘束装置
４゜５が所定位置に上昇した時点の図である。ここで、
所望の内歯車の外径をＲとすると、ロール半径がｒ、上
ポンチ２の中心とロールの中心の長手方向の距離がＣの
場合、ロール４の上面４Ａの、下型３の加圧面３Ａから
の移動量りは次式で求められる。Embodiments of the present invention will be described below with reference to the drawings. First, the first
The figure shows the configuration of the present invention. The present invention includes a cylindrical upper punch 2 having a thickness al longer than the plate width W of the long strip material 1 and having a toothed part 2A having a predetermined modular shape and a radius Rp. , punch holders 6A and 6B that support this from both sides and one of which is detachable from the connecting portion 2B of the upper punch.
and (1) a pressing surface 3A in which the length a2 of the pressing part in the width direction is longer than the plate width of the long strip material 1, and the length a of the pressing part in the longitudinal direction is sufficiently longer than the length in the longitudinal direction of the toothed part. A bending machine consisting of a lower mold having a lower mold, a roll holder 5 which is installed on the feeding direction side of the long strip material 1 of the lower mold 3, and can be lowered and raised in synchronization with the raising and lowering of the upper punch 2, and a roll 4. It consists of a restraint device. FIG. 2 is a side view of FIG. 1. It is a diagram at the time when the upper punch 2 reaches a predetermined bottom dead center and the bending restraint device 4.degree. 5 rises to a predetermined position. here,
If the desired outer diameter of the internal gear is R, the roll radius is r, and the longitudinal distance between the center of the upper punch 2 and the center of the roll is C, then the pressure surface 3A of the lower die 3 on the upper surface 4A of the roll 4 The amount of movement from is calculated using the following formula.
次に具体例によって、実施例の動作を示す。Next, the operation of the embodiment will be explained using a specific example.
加工対象とする内歯車は、内側にピッチ円直径ｄ＝２０
０ｎｎ、モジュールｍ＝４．歯数ｚ＝５０のインボリュ
ート平歯車をかみ合わせるもので、ピッチ円直径ｄ、＝
１０００ｎｅ、モジュールｍ＝４、歯数ｚ、＝２５０
．歯の先端と外周の距離ｔ０＝２５ｎｎ、歯幅ｗ０＝８
０＋ｍである。The internal gear to be machined has a pitch circle diameter d = 20 on the inside.
0nn, module m=4. It engages an involute spur gear with the number of teeth z = 50, and the pitch circle diameter d, =
1000ne, module m = 4, number of teeth z, = 250
．． Distance between tooth tip and outer periphery t0 = 25nn, tooth width w0 = 8
0+m.
第３図は、長尺帯状素材１である。板幅Ｗ＝８５１１Ｉ
ｎ、板厚ｔ＝３０ｍｎ、長さ１＝３，５００ａ＋。FIG. 3 shows a long strip-shaped material 1. Plate width W=8511I
n, plate thickness t=30mm, length 1=3,500a+.
材質は８４５Ｃである。上ポンチ２の半径はＲｐ＝４０
０ｎｎ、厚さはａ□＝ １００ｍ＋である。第４図に上
ポンチ２の歯加工部２Ａの詳細を示す。歯加工部２Ａは
上ポンチ２の本体２Ｄと分割されており、アリ溝及び圧
入スペーサ２Ｃにより結合されている。この様な構造の
ため、各種の仕様に対応できる。歯加工部２Ａは、成形
する歯形インボリュート歯形を反転写したものに、約１
ｍの仕上代を見込んだ形状をしている。下型３の寸法は
、ａ、＝５００ｍｍ、ａ、＝３００ｍｍである。また、
Ｃ＝２８０ｆｆｏ、ｒ＝１００ｍｍとした。長尺帯状素
材１の送りピッチＰはｐ＝π・ｍとする。The material is 845C. The radius of upper punch 2 is Rp = 40
0nn, and the thickness is a□=100m+. FIG. 4 shows details of the tooth processing section 2A of the upper punch 2. The tooth processing section 2A is separated from the main body 2D of the upper punch 2, and is connected by a dovetail groove and a press-fit spacer 2C. Due to this structure, various specifications can be accommodated. The tooth processing part 2A is formed by retransferring the involute tooth profile to be molded, and the tooth profile is approximately 1
The shape allows for a finishing allowance of m. The dimensions of the lower mold 3 are a = 500 mm and a = 300 mm. Also,
C=280ffo, r=100mm. The feeding pitch P of the long strip material 1 is p=π·m.
第５図に加圧前の状態を示す。長尺帯状素材１のハンド
側ＩＣをハンドリング装置（図示せず）で把持し下型３
の所定位置に移送し載置する１曲げ拘束装置４，５は、
ロール４の上面４Ａが下型３の加圧面３Ａと同一面上に
なる様にした。Figure 5 shows the state before pressurization. The hand-side IC of the long strip material 1 is grasped by a handling device (not shown), and the lower die 3
The first bending restraint devices 4 and 5 are
The upper surface 4A of the roll 4 was made to be on the same plane as the pressing surface 3A of the lower die 3.
曲げ拘束装置４，５は加圧の初期においては、上ポンチ
と同期して上、下動せず、長尺帯状素材１の先端ＩＡが
ロール４の上面４Ａを通過して以降から動作する構造と
した。Ｐ＝π・ｍ１２．６ｗ、ｃ＝２８０ｎｏであるか
ら、２３回目以降に曲げ拘束装置４，５が上下動する。The bending restraint devices 4 and 5 do not move up or down in synchronization with the upper punch at the initial stage of pressurization, but are configured to start operating after the tip IA of the long strip material 1 passes the upper surface 4A of the roll 4. And so. Since P=π·m12.6w and c=280no, the bending restraint devices 4 and 5 move up and down from the 23rd time onwards.
すなわち、２３回目の加圧前に長尺帯状素材１を長手方
向へ送る時には、曲げ拘束装置４，５は下降しており、
加圧と同時に上昇し、上ポンチ２が下死点に達した時点
で所定位置へ上昇している。上ポンチ２が上昇すると同
時に元の位置へ復帰する。この移動量りは前述の式から
求められる。ｒ＝１００＋ｍ、ｃ＝２８０ｎｍ、Ｒは加
工対象の内歯車のピッチ円直径ｄ、＝１０００ｍｍ及び
長尺帯状素材１の厚さｔ＝３０ｍｍから、Ｒ＝５２６＋
ｎ＋ｎである。That is, when feeding the long strip material 1 in the longitudinal direction before the 23rd pressurization, the bending restraint devices 4 and 5 are lowered,
It rises simultaneously with pressurization, and rises to a predetermined position when the upper punch 2 reaches the bottom dead center. At the same time as the upper punch 2 rises, it returns to its original position. This amount of movement can be found from the above equation. r = 100 + m, c = 280 nm, R is the pitch circle diameter d of the internal gear to be processed, = 1000 mm, and the thickness t = 30 mm of the long strip material 1, R = 526 +
It is n+n.
したがって、ｈ＝６６．１ｍａ＋である。Therefore, h=66.1ma+.
２４回目以降も同様に繰返し、２５０回で終了する。こ
の時点で、成形品はスプリングバックにより外径が約１
０％拡大しており、且っ把持部ＩＤが直線的に残存して
いる（第６図参照）。そこで、ホルダ６Ｂをはずして、
加工品を取り出し、把持部ＩＤを所定の長さで切断する
と同時に、その切断部ＩＥ及び先端部ＩＡを第７図のご
とく溶接しやすい様に切欠き１’Ｅ、１”Ｅを、サンダ
ー等で形成する。The process is repeated in the same manner from the 24th time onwards, and ends at 250 times. At this point, the outer diameter of the molded product has decreased by approximately 1 due to springback.
It has been enlarged by 0%, and the gripping portion ID remains linearly (see FIG. 6). Therefore, remove the holder 6B,
Take out the processed product and cut the gripping part ID to a predetermined length. At the same time, make notches 1'E and 1"E with a sander, etc. to make it easier to weld the cut part IE and tip part IA as shown in Figure 7. to form.
次にＬＡ、ＩＥをつけ合わせて溶接し、歯幅（仕上代＝
５ｍ）、内、外径（仕上代＝５ＩＩＩＩり。Next, LA and IE are tacked together and welded, and the face width (finishing allowance =
5m), inner and outer diameter (finishing allowance = 5III).
最後に歯形の順で切削仕上げ加工を施す。Finally, finish cutting is performed in the order of the tooth profile.
以上の様に、一方が着脱可能なホルダにより両サイドか
らサポートされ、且つ歯加工部を分割した円柱状の上ポ
ンチを用いると共に１曲げ拘束装置を設けた結果、各種
の大形内歯車の素形材を仕上代敵国以内で加工出来るよ
うになった。As described above, as a result of using a cylindrical upper punch, one of which is supported from both sides by a removable holder and whose tooth processing part is divided, and one bending restraint device, it is possible to make various large internal gears. Shapes can now be processed within enemy territory.
本発明によれば、専用機を用いず、既存のプレスにより
安価かつ汎用性のある工具で、材料歩留りよく、大形内
歯車の素形材が成形でき、切削仕上げの時間を、全切削
仕上げの場合と比較して大幅に短縮出来るため、安価な
大形内歯車を供給できる。According to the present invention, the material for a large internal gear can be formed with a high material yield using an inexpensive and versatile tool using an existing press without using a special machine, and the time required for cutting and finishing can be reduced. Since the time can be significantly shortened compared to the case of , it is possible to supply inexpensive large internal gears.
第１図は本発明の一実施例を示す斜視図、第２図はその
側面図、第３図は加工の対象としだ長尺帯状素材の斜視
図、第４図は上ポンチの歯加工部の拡大図、第５図は加
圧の初期状態図、第６図はプレスによる加圧終了後、上
ポンチから取りはずした加工品の正面図、第７図はプレ
ス加工品両端部を溶接しやすいように形成した後の一端
の拡大図である。
１・・・長尺帯状素材、２・・・上ポンチ、２Ａ・・・
歯加工部、３・・・下型、４・・・ロール、５・・・ロ
ールホルダ。
６Ａ、Ｂ・・・ホルダ。
麓
図
第
面
萬
図
第
図Fig. 1 is a perspective view showing an embodiment of the present invention, Fig. 2 is a side view thereof, Fig. 3 is a perspective view of a long strip material to be processed, and Fig. 4 is a tooth processing section of an upper punch. Figure 5 is a diagram of the initial state of pressurization, Figure 6 is a front view of the workpiece removed from the upper punch after pressurization, and Figure 7 is an easy to weld both ends of the press workpiece. FIG. 3 is an enlarged view of one end after being formed as shown in FIG. 1...Long strip material, 2...Upper punch, 2A...
Tooth processing section, 3...lower die, 4...roll, 5...roll holder. 6A, B...Holder. Map of the foot of the mountain
Claims (1)
成形する突起状の歯加工部有するとともに、内歯車の内
径より十分小さい外径の円柱状上ポンチと、前記上ポン
チの両サイドに位置し、該上ポンチを一方が着脱可能な
ごとくサポートするホルダと、幅方向加圧部長さが前記
長尺帯状素材の板幅より長く、且つ前記上ポンチの歯加
工部の長手方向加圧部長さよりも十分長い長手方向加圧
部長さの加圧面を有する下型と、下型の近傍で且つ該長
尺帯状素材の長手方向送り側に載置したロールとロール
ホルダから構成され、前記上ポンチによる該長尺帯状素
材の加圧と同時に上昇し、下死点で所定位置に達し、該
上ポンチの上昇とともに下降して所定の位置へ復帰する
ような機能を有する曲げ拘束装置とにより、前記上ポン
チと下型の間に挿入した前記長尺帯状素材の板幅の全長
を、前記上ポンチの歯加工部で長手方向に所望する歯ピ
ッチ、所定の加圧量で、所定の歯数分だけ、該長尺帯状
素材の長手方向に沿って順次加圧して、該長尺帯状素材
を前記上ポンチによる加圧側を内側にしたリング状に成
形し、しかる後その両端を所望の長さに切断すると同時
に、溶接に適するごとく切欠きを形成し、その両端を溶
接して成形した素形材を切削仕上げすることを特徴とし
た大形内歯車の加工法。1. A cylindrical upper punch that is longer than the plate width of the long strip material and has a protruding tooth processing part that forms the tooth part of the internal gear, and has an outer diameter sufficiently smaller than the inner diameter of the internal gear; holders located on both sides and supporting the upper punch so that one of the upper punches is removably attached; Consisting of a lower mold having a pressing surface with a length of the pressing part in the longitudinal direction sufficiently longer than the length of the pressing part, a roll and a roll holder placed near the lower mold and on the longitudinal feeding side of the long strip material, A bending restraint device having a function of rising simultaneously with the pressurization of the long strip material by the upper punch, reaching a predetermined position at the bottom dead center, and descending as the upper punch rises to return to the predetermined position. Then, the entire length of the plate width of the long strip material inserted between the upper punch and the lower mold is set to a predetermined value using the tooth processing part of the upper punch in the longitudinal direction at a desired tooth pitch and a predetermined amount of pressure. Pressure is sequentially applied along the longitudinal direction of the long strip material by the number of teeth to form the long strip material into a ring shape with the side pressed by the upper punch facing inside, and then the both ends are pressed into the desired shape. A processing method for large internal gears that is characterized by cutting to length, forming notches suitable for welding, welding both ends of the notches, and cutting and finishing the formed material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24101388A JPH0295521A (en) | 1988-09-28 | 1988-09-28 | Processing method of large size inner gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24101388A JPH0295521A (en) | 1988-09-28 | 1988-09-28 | Processing method of large size inner gear |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0295521A true JPH0295521A (en) | 1990-04-06 |
Family
ID=17068035
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24101388A Pending JPH0295521A (en) | 1988-09-28 | 1988-09-28 | Processing method of large size inner gear |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0295521A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013536377A (en) * | 2010-07-02 | 2013-09-19 | アクティエボラゲット・エスコーエッフ | Bearing ring and manufacturing method thereof |
| CN111215493A (en) * | 2019-07-02 | 2020-06-02 | 西安交通大学 | Method for bending and forming large-diameter gear by rack and toothed chain meshed three-roller |
-
1988
- 1988-09-28 JP JP24101388A patent/JPH0295521A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013536377A (en) * | 2010-07-02 | 2013-09-19 | アクティエボラゲット・エスコーエッフ | Bearing ring and manufacturing method thereof |
| US9360050B2 (en) | 2010-07-02 | 2016-06-07 | Aktiebolaget Skf | Bearing ring and a method for its manufacturing |
| CN111215493A (en) * | 2019-07-02 | 2020-06-02 | 西安交通大学 | Method for bending and forming large-diameter gear by rack and toothed chain meshed three-roller |
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