JPS6157131B2 - - Google Patents
Info
- Publication number
- JPS6157131B2 JPS6157131B2 JP55077464A JP7746480A JPS6157131B2 JP S6157131 B2 JPS6157131 B2 JP S6157131B2 JP 55077464 A JP55077464 A JP 55077464A JP 7746480 A JP7746480 A JP 7746480A JP S6157131 B2 JPS6157131 B2 JP S6157131B2
- Authority
- JP
- Japan
- Prior art keywords
- blade
- saw blade
- welding
- cutting
- base material
- 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.)
- Expired
Links
- 239000000463 material Substances 0.000 claims description 44
- 238000003466 welding Methods 0.000 claims description 22
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 description 29
- 239000011247 coating layer Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 229910001315 Tool steel Inorganic materials 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000003698 laser cutting Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000005121 nitriding Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- MTPVUVINMAGMJL-UHFFFAOYSA-N trimethyl(1,1,2,2,2-pentafluoroethyl)silane Chemical compound C[Si](C)(C)C(F)(F)C(F)(F)F MTPVUVINMAGMJL-UHFFFAOYSA-N 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 2
- 229910052580 B4C Inorganic materials 0.000 description 1
- 229910052582 BN Inorganic materials 0.000 description 1
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 238000010000 carbonizing Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000112 cooling gas Substances 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000007733 ion plating Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000005240 physical vapour deposition Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 150000003609 titanium compounds Chemical class 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Welding Or Cutting Using Electron Beams (AREA)
- Laser Beam Processing (AREA)
Description
【発明の詳細な説明】
本発明は帯状高硬高摩耗抵抗性の鋸刃金属を鋸
歯材として基材に溶接し成形する複合鋸刃の製造
方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a composite saw blade in which a saw blade metal strip having high hardness and high wear resistance is welded to a base material as a saw blade material and then formed.
在来の鋸刃材料は各種のものが用いられてきた
が、最も多量に用いられるのは、刃先と刃と基材
とが、ほとんど同じ材料であつて、刃先に特殊処
理をし又は鋸刃全体を熱処理したものが多い。本
来、基体材料と切断刃材料との適当機能が相違す
るのであるから、それぞれの部分に最適のものを
最適の形状を付して製作したものが適当である
が、多くの提案が具体的になされたが、まだ充分
なものは得られない。刃先に最適の熱処理をする
と基体が脆くなり、使用中に刃先が充分に使用可
能であつても基体が折損することがあり、基体と
刃先の燃処理の仕方を、それぞれに適するように
施しても、その境界に問題が生ずる。それらの欠
点を解決するために基体として最適の部材と刃先
に最適の部材とを溶接し、次に研摩切削等の手段
により鋸刃を形成することも提案されてはいる
が、溶接する際の熱による材料の永久変形や脆弱
化を防げることが困難で刃材の幅や鋸刃の高さに
制約が生じる等の問題が依然として存在する。 Various types of conventional saw blade materials have been used, but the most commonly used material is one in which the cutting edge, blade, and base material are almost the same material, and the cutting edge is specially treated or the saw blade is made of the same material. Many are completely heat treated. Originally, the appropriate functions of the base material and the cutting blade material are different, so it would be appropriate to manufacture the optimal shape for each part, but many proposals are not specific. has been done, but not enough has been achieved. If the optimum heat treatment is applied to the cutting edge, the base will become brittle, and the base may break during use even if the cutting edge is fully usable. However, problems arise at the boundaries. In order to solve these drawbacks, it has been proposed to weld the optimal material for the base and the optimal material for the cutting edge, and then form the saw blade by means such as abrasive cutting. Problems still exist, such as difficulty in preventing permanent deformation and brittleness of the material due to heat, resulting in restrictions on the width of the blade material and the height of the saw blade.
本発明は、刃の刃先と基材とに、それぞれ最適
の材料を用い、基体材料となる帯状体に一定間隔
で一定水準の未加工の端面を有する波状刃形を予
め付しておき、前記基体と刃材との溶接を前記一
定水準の端面のみで行なつた後、前記刃材を所定
の刃形状に切断加工してなるもので、前記の欠点
を解消するのに顕著な効果をもたらす鋸刃の提供
を目的とする。 The present invention uses optimal materials for the cutting edge of the blade and the base material, and attaches in advance a wavy blade shape having unprocessed end faces of a constant level at regular intervals to the band-shaped body serving as the base material. The blade material is welded to the base body and the blade material only at the end face of the certain level, and then the blade material is cut into a predetermined blade shape, which has a remarkable effect in eliminating the above-mentioned drawbacks. The purpose is to provide saw blades.
次に、本発明を１実施例について説明する。第
１図は製造過程を示す１部拡大平面図。第２図は
レーザービームによる溶接を示し、鋸刃は平面図
で示す。鋸刃は全体を呼び、鋸刃は刃先部分を呼
ぶ。 Next, one embodiment of the present invention will be described. FIG. 1 is a partially enlarged plan view showing the manufacturing process. FIG. 2 shows welding with a laser beam, and the saw blade is shown in plan view. A saw blade is called the whole part, and a saw blade is called the cutting edge part.
鋸刃の基材１には、一定間隔で一定水準の未加
工端面５を有する波形刃形を予め付しておき、刃
には鋸刃と同じ厚さで所定の幅ｔを付した鋸刃材
の板２を溶接し、次に刃先を残して溶断し、所定
形状の刃７と先端６を形成仕上げる。 A wavy blade shape having unprocessed end faces 5 of a certain level at regular intervals is attached to the base material 1 of the saw blade in advance, and the saw blade has the same thickness as the saw blade and a predetermined width t. A plate 2 of the material is welded and then cut by cutting leaving the cutting edge to form a blade 7 and tip 6 of a predetermined shape.
例えば、帯鋸として、使用条件に最適の材料
が、帯鋸刃の基材１に最適なものとして炭素工具
鋼SK5（日本標準規格、炭素0.8〜0.9％、けい素
0.35％以下マンガン0.5％以下、低燐・低硫黄）
をよく調質し、ロツクウルＣ硬度60として用い
る。例えば刃先材２として、高速度工具鋼SKH5
（日本標準規格、炭素0.2〜0.4％、クロム3.8〜4.5
％、タングステン17〜22％、バナジウム1.0〜1.5
％、コバルト16〜17％）を用いる。 For example, for a band saw, the material most suitable for the usage conditions is carbon tool steel SK5 (Japanese standard, 0.8-0.9% carbon, silicon) for the base material 1 of the band saw blade.
0.35% or less Manganese 0.5% or less, low phosphorus/low sulfur)
It is well tempered and used as Rokuuru C hardness 60. For example, as the cutting edge material 2, high speed tool steel SKH5
(Japanese Standards, Carbon 0.2-0.4%, Chromium 3.8-4.5
%, tungsten 17-22%, vanadium 1.0-1.5
%, cobalt 16-17%).
所定の刃空間３と溶接端面５を、予め基材板１
に付しておき、別に適合寸法の刃材板２を製作
し、溶接面５にレーザーの高エネルギービームを
収束して溶接し、次に所定形状の歯先７と全体を
揃えた刃の尖端６を付して歯先として残して余部
を切断して除去する。 A predetermined blade space 3 and welding end surface 5 are set in advance on the base plate 1.
Separately, a blade material plate 2 of suitable dimensions is manufactured, and a high-energy laser beam is focused and welded on the welding surface 5, and then the tip of the blade is aligned with the tooth tip 7 of a predetermined shape. 6 and leave it as the tip of the tooth and cut off the remaining part to remove it.
次に前記の刃先７を包含する鋸刃１に、必要に
応じて、さらに、炭化チタン又は窒化チタンを蒸
着して帯鋸を完成する。 Next, if necessary, titanium carbide or titanium nitride is further deposited on the saw blade 1 including the cutting edge 7 to complete the band saw.
前記の実施例は、説明の便宜上、SK5とSKH5
と、次のチタン化合物の蒸着層コーテイングを述
べたが、これらの材質に限定するものではない。
必要に応じ、例えばSKH5を基材１とすること
も、また低炭工具鋼、ステンレス鋼に代えること
も、刃先にタングステン、チタン、ほう素の窒化
物、炭化物その他の工具に適する材質の板を、刃
先材２として、直接に刃の部分５に溶接し、切断
し、刃先７と尖端６を形成し、さらに炭化タング
ステンを表面に蒸着又はイオンプレーテイングす
るような過程を経て、所望の鋸刃を得ることがで
きる。また成形した鋸刃を包含する刃先７に、炭
化タングステンを蒸着して形成した被覆層の上に
窒化チタン若しくは炭化チタンをイオンプレーテ
イングPVD，CVDその他の過程を経て、コーテ
ング層を形成することもできる。 For convenience of explanation, the above embodiments are based on SK5 and SKH5.
Although the following vapor-deposited layer coating of a titanium compound has been described, the material is not limited to these materials.
If necessary, for example, you can use SKH5 as the base material 1, or you can replace it with low carbon tool steel or stainless steel, or you can use a plate of tungsten, titanium, boron nitride, carbide, or other material suitable for tools on the cutting edge. , as the cutting edge material 2, it is directly welded to the blade part 5, cut to form the cutting edge 7 and point 6, and then evaporated or ion plated tungsten carbide on the surface to form the desired saw blade. can be obtained. Alternatively, a coating layer may be formed on the cutting edge 7 that includes the formed saw blade by ion plating titanium nitride or titanium carbide on a coating layer formed by vapor-depositing tungsten carbide, PVD, CVD, or other process. can.
鋸刃の空間３、底４、溶接面５などは、基材１
に打抜その他の過程を経て形成しておく。刃先７
と尖端６は、溶接した板２から、溶接時のレーザ
ーを用いて切り落として成形する。切断面につい
て、必要な場合は適当した仕上方法を用いて仕上
げる。 The saw blade space 3, bottom 4, welding surface 5, etc. are the base material 1.
It is then formed through punching and other processes. Blade tip 7
The tip 6 is formed by cutting off the welded plate 2 using a laser during welding. If necessary, finish the cut surface using an appropriate finishing method.
前記のSK5鋼のSKH5鋼を溶接して形成する金
切鋸盤用の普通形状の帯鋸の場合には、板２の溶
接時に、エネルギ発生機１９から発生するビーム
１８として、1KWレーザーを用いてビームの絞
りを８×108W／cm2に絞つて、溶接速度を1.3cm／
secにして行つた。板厚は1.8mmの材料を用いた。
溶接結果はきわめて良好であつた。 In the case of a normal-shaped band saw for a metal cutting saw machine, which is formed by welding SKH5 steel of the SK5 steel mentioned above, a 1KW laser is used as the beam 18 generated from the energy generator 19 when welding the plate 2. The beam aperture was narrowed down to 8×10 8 W/cm 2 and the welding speed was 1.3 cm/cm 2 .
I went to sec. A material with a plate thickness of 1.8 mm was used.
The welding results were extremely good.
次に、刃先７を形成するために、この点は溶接
の場合も同様であるが、ビーム１８をプリズム１
７を通しレンズ１３で集束したビーム１２を、切
断部１１にエネルギー量1010W／cm2を照射を照射
し、切断速度１cm／secで正確良好な切断面が得
られた。この切断後に切断面を研削仕上をし、必
要に応じて、さらに、前記したコーテイング層形
成過程を施して製品を得た。前記溶接と切断の速
度は、他の場合に比しきわめて大である。このよ
うに本発明は母材への刃材の溶接と、溶接板から
刃形のカツトとをレーザーを用いて行なうように
したので、従来の焼結刃付のもの又は１体材質の
ものに比較して、製造過程がきわめて単純で作業
が容易であり効率が向上し、高い速度で実施で
き、溶接も堅固確実であつた。溶接は任意の気体
中、加圧気体中で行なうことができ、アルゴン等
の不活性気体を吹付ながら溶接すれば酸化等を伴
なわずに良好な溶接ができ、窒化雰囲気、炭化雰
囲気を利用すれば窒化、炭化等の処理もできる。
また冷却気体の加圧噴射によつて急冷しながら溶
接することが可能である。さらに溶接に次いで鋸
刃を歯切り成形するときも、溶接時のレーザービ
ームを用いてレーザーカツトするから、硬度に影
響されずにカツトでき、ビームの絞り走査により
きわめて精密に、簡単容易に加工成形することが
できる。 Next, in order to form the cutting edge 7, the beam 18 is moved through the prism 1, which is the same in the case of welding.
The cutting portion 11 was irradiated with a beam 12 focused by a lens 13 through a beam 12 having an energy amount of 10 10 W/cm 2 , and an accurate cut surface was obtained at a cutting speed of 1 cm/sec. After this cutting, the cut surface was finished by grinding, and if necessary, the coating layer forming process described above was further performed to obtain a product. The welding and cutting speeds are much higher than in other cases. In this way, the present invention uses a laser to weld the blade material to the base metal and cut the blade shape from the welded plate, so it can be replaced with a conventional blade with a sintered blade or one made of one piece. In comparison, the manufacturing process was extremely simple, easy to work with, improved efficiency, could be carried out at high speeds, and the welding was solid and reliable. Welding can be performed in any gas or pressurized gas, and if welding is performed while spraying an inert gas such as argon, good welding can be achieved without oxidation, and it is possible to perform welding in a nitriding or carbonizing atmosphere. Treatments such as nitriding and carbonization can also be performed.
Further, it is possible to weld while rapidly cooling by pressurized injection of cooling gas. Furthermore, when cutting and shaping the saw blade after welding, the laser beam used during welding is used for laser cutting, so cutting can be done without being affected by hardness, and the aperture scanning of the beam allows extremely precise processing and easy processing. can do.
またレーザーを用いたことによりビームの集束
制御が容易で、溶接もカツト加工を加工部に最適
エネルギを容易に供給でき、また気中で作業で
き、作業性が極めて良好であつた。なおレーザー
カツト後に形成した鋸刃部分に、必要に応じて適
当な材料の高確度な被覆層を、重層し、また材質
の種類を変えて複数層の被覆を形成することがで
きる。したがつて、耐用性が高く、効率のきわめ
て高い鋸刃を有し、良切削性、高硬度、高耐用性
をそなえた鋸刃がたやすく得られる。 Furthermore, by using a laser, it was easy to control the beam focus, and the optimum energy could be easily supplied to the processing section for welding and cutting, and work could be done in the air, resulting in extremely good workability. Note that a highly accurate coating layer of an appropriate material can be overlaid on the saw blade portion formed after laser cutting, if necessary, or a plurality of coating layers can be formed by changing the type of material. Therefore, a saw blade having high durability and extremely high efficiency, good cutting performance, high hardness, and high durability can be easily obtained.
また、量産したいときには、板１と２とをセツ
トした相対位置を維持してコンベア上を又はロー
ラー上を搬送しながら、前記のように、集束ビー
ム１２をもつて、照射部１１に照射するエネルギ
ーを調節して加え、溶接又は切断の作業をするこ
とができる。こうして高速度をもつて比較的にた
やすく高い効率のもとで製造したた鋸刃は、変形
がきわめて小で、堅固であり、適材性を十分に生
かされ、耐用性が高い。 In addition, when mass production is desired, energy is irradiated onto the irradiation section 11 with the focused beam 12 as described above while maintaining the relative positions of the plates 1 and 2 and conveying them on a conveyor or on a roller. can be adjusted and added to perform welding or cutting work. The saw blade manufactured in this way at high speed, relatively easily, and with high efficiency has extremely little deformation, is strong, takes full advantage of the properties of the material, and has high durability.
第１図は、本発明の１実施例の製造過程を示す
一部拡大平面図。第２図は平面図で示す鋸刃にエ
ネルギー照射をする過程の側面図。
１……基材、２……刃材、３……空間、４……
刃の底、５……溶接面、６……刃の尖端、ｔ……
幅寸法、１１……照射部、１２，１８……レーザ
ービーム、１６……容器、１４……雰囲気。
FIG. 1 is a partially enlarged plan view showing the manufacturing process of one embodiment of the present invention. FIG. 2 is a side view of the process of irradiating energy to the saw blade shown in plan view. 1... Base material, 2... Blade material, 3... Space, 4...
Bottom of the blade, 5... Welding surface, 6... Tip of the blade, t...
Width dimension, 11... Irradiation section, 12, 18... Laser beam, 16... Container, 14... Atmosphere.
Claims (1)
鋸刃を形成する方法に於て、前記鋸刃の基材に予
め所定の間隔で一定水準の未加工或いは平面加工
を施した端面５を有する連続刃形を付しておき、
前記帯状刃材２と前記基材１とを前記一定水準の
端面５のみで溶接した後、レーザビームを用いて
前記帯状刃材を所要の刃形に切断してなることを
特徴とする鋸刃の製造方法。1. In a method of forming a saw blade by welding a band-shaped optimum blade material 2 to a base material 1 of a saw blade, the base material of the saw blade is previously subjected to a certain level of unfinished or flat processing at predetermined intervals. A continuous blade shape having a curved end surface 5 is attached,
A saw blade characterized in that the band-shaped blade material 2 and the base material 1 are welded only at the end face 5 of the certain level, and then the band-shaped blade material is cut into a desired blade shape using a laser beam. manufacturing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7746480A JPS578028A (en) | 1980-06-09 | 1980-06-09 | Manufacturing of saw blade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7746480A JPS578028A (en) | 1980-06-09 | 1980-06-09 | Manufacturing of saw blade |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS578028A JPS578028A (en) | 1982-01-16 |
| JPS6157131B2 true JPS6157131B2 (en) | 1986-12-05 |
Family
ID=13634712
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7746480A Granted JPS578028A (en) | 1980-06-09 | 1980-06-09 | Manufacturing of saw blade |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS578028A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6021140A (en) * | 1983-07-16 | 1985-02-02 | Sumitomo Electric Ind Ltd | Hot forging tool |
| JPS6025616A (en) * | 1983-07-19 | 1985-02-08 | Sumitomo Electric Ind Ltd | Preparation of composite blank |
| JP2009095919A (en) * | 2007-10-16 | 2009-05-07 | National Agriculture & Food Research Organization | Replaceable tubular cutting edge |
| CN102380668A (en) * | 2010-08-31 | 2012-03-21 | 深圳市春来机电工具制造有限公司 | High-quality and energy-saving gear-grinding jig saw and production process thereof |
-
1980
- 1980-06-09 JP JP7746480A patent/JPS578028A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS578028A (en) | 1982-01-16 |
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