JPS5937696B2 - Sewing machine needle manufacturing method - Google Patents

Description

【発明の詳細な説明】 本発明は針線素材を押型によリプレスすることでミシン
針とするミシン針の製造方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a sewing machine needle by repressing a needle wire material with a press die.

一般にミシン針をプレス加工で正式することは大量生産
に適合させる方法としては効果的であることが知られ既
瘉こ実用化されて多用されている。Generally, forming sewing machine needles by press processing is known to be an effective method for adapting to mass production, and has already been put into practical use and is widely used.

しかしプレス成型のミシン針では、プレス時に半円溝を
有する一対のプレス用金型の上下型が針体の断面形を変
化させる過程で前記両金型が合致するまでにその間隙部
分に針体素材がはみ出し、所謂耳部分が針幹外周面より
突出してでき、その結果耳部分の厚味のできることを考
慮して押型を形成して置く必要があり、且つ針体自体で
はこのはみ出し部分を研摩或いは削り取らねばならない
がこの削り取り加工は過不足なく行うことはかなり面倒
なことで、例えば削り取りすぎると溝が浅くなり所要の
強度を保有しなくなるし、削り取りが不足すると貫通抵
抗が増大し糸切れ並びに発熱現象も顕著となり針の切損
を多くするし、縫製操業の高速度化は不可能で作業性を
劣化する結果となるため加工には相当の熟練を要するし
連続加工ができず生産性をあげるには限界があると共に
はみ出し部分を研摩するのには針材を揃えて加工する必
要があつて、この前処理工程はかなりの手間となり、そ
の調整の良否が針仕上げに与える影響も大きく製品精度
にバラツキが生じやすいなど針製造工程に改善する余地
が残されていた。本発明ではこれら従来のプレスにて正
式されるミシン針製法にある問題点を容易に解決すると
共に加工手数の簡略化を可能にし、生産性と能率との著
しい向上を行ない得るミシン針の製造方法を提示しよう
とするにある。However, with press-molded sewing machine needles, during pressing, the upper and lower dies of a pair of press dies having semicircular grooves change the cross-sectional shape of the needle body. The material protrudes and a so-called selvedge protrudes from the outer circumferential surface of the needle stem.As a result, the selvage becomes thicker, so it is necessary to form a mold, and the needle body itself must be polished to remove this protruding portion. Or, it has to be scraped off, but it is quite troublesome to perform this scraping process with just the right amount.For example, if you scrape off too much, the groove will become shallow and will no longer have the required strength, and if you scrape off too little, the penetration resistance will increase, leading to thread breakage and problems. The heat generation phenomenon is also noticeable, leading to many needle breakages, and it is impossible to increase the speed of sewing operations, resulting in poor workability, which requires considerable skill in processing, and continuous processing is not possible, which reduces productivity. There is a limit to how much needle material can be raised, and polishing the protruding parts requires aligning the needle materials and processing them. This pretreatment process is quite time-consuming, and the quality of the adjustment has a large effect on the needle finish. There remained room for improvement in the needle manufacturing process, such as the tendency for variations in accuracy to occur. The present invention provides a method for manufacturing sewing machine needles that easily solves the problems that exist in the conventional sewing machine needle manufacturing method using a press, simplifies the number of processing steps, and significantly improves productivity and efficiency. This is what I am trying to present.

また本発明の目的は針材のプレスミシン針の連続加工を
熟練を要することなく可能とし、針自体の品質を極めて
良好にし且つ均等製品を得る有効・合理的な手段を提示
しようとする曇こある。Another object of the present invention is to enable continuous processing of press sewing machine needles of needle material without requiring any skill, to improve the quality of the needle itself, and to provide an effective and rational means for obtaining uniform products. be.

更に本発明の他の目的はプレス用の金型の製作を簡便化
し、且つ事後処理での経費を節減でき著しくコストを安
価にし、単価割安とすることができる簡便な手段を提示
しようとするにある。本発明は針体素材を一対のプレス
用押型にて変形させ針幹長手方向に添つた長溝と短溝と
を対向して配備した凹溝付きのミシン針とするものにお
いて、針穴をつくるべき針尖端部形成予定部分の先端に
平坦な基準面部を針幹外周溶より張り出して型押成形し
、この張り出した基準面部の側端縁をミシン針針幹の軸
芯に添つて平行な面となるように針幹外周縁より外側位
置に寸法合せ面を形成したのち該寸法合せ面を枕部に載
置し、該寸法合せ面と針幹外周縁とが交互に当接するよ
うに針幹を枕部上にころがして変位し回転グラインダに
よつて針幹側面に突出した耳部分を切削するとともに針
穴穿設予定部分附近に針幹外周縁より内方にへこんだ凹
状の削ぎ取り部を形成して針穴を長溝と短溝とを貫通す
る位置に穿設したのち前記基準面部を切断し、前記針穴
部分より先端を尖端部に研摩することを特徴とするもの
である。本発明を実施絢こつき図面を参照して説明する
と、針体素材をロータリースウエジングによつて線材の
一部を細め針幹１となるように打伸し小径部を形成した
のち、該小径部に針体素材の断面円形の直径方向（針軸
芯と垂直面）を制御するために基準面部２を型押形成し
、次で加工型押後の製品がミシン針の仕上品（完成品）
形状に最も良く合致させるために予備加工として針体素
材の金属配分を考慮して針幹部分をその軸方向に添つて
長溝３と短溝４とを対向配備した状態に金型（図示せず
）をもつて加圧鍛造するが、前記基準面部２と針幹部分
の圧造は別々に加工しないで同時に圧造することもでき
る。Furthermore, another object of the present invention is to provide a simple means that can simplify the production of press molds, reduce post-processing costs, significantly reduce costs, and reduce the unit price. be. The present invention provides a sewing machine needle with a recessed groove in which the needle material is deformed by a pair of pressing dies and a long groove and a short groove running along the length of the needle stem are arranged opposite each other, in which the needle hole should be made. At the tip of the part where the needle tip is to be formed, a flat reference surface is overhanging from the outer periphery of the needle stem and molded by embossing, and the side edges of this overhanging reference surface are parallel to the axis of the sewing machine needle stem. After forming a dimensional matching surface at a position outside the outer periphery of the needle shaft so that It is rolled onto the pillow part and displaced, and a rotating grinder cuts off the protruding ear part on the side surface of the needle shaft, and forms a concave scraped part recessed inward from the outer periphery of the needle shaft near the area where the needle hole is planned to be drilled. After drilling a needle hole at a position penetrating the long groove and the short groove, the reference surface portion is cut, and the tip is ground from the needle hole portion to a pointed end. To explain the present invention with reference to the detailed drawings, a part of the wire rod is drawn by rotary swaging to form a small diameter part by rotary swaging, and then a small diameter part is formed. In order to control the diameter direction (perpendicular to the needle axis) of the circular cross-section of the needle body material, a reference surface part 2 is embossed on the section, and the product after processing and embossment is the finished product of the sewing machine needle (finished product). )
In order to best match the shape, as a preliminary process, a mold (not shown) is formed in which the long grooves 3 and short grooves 4 are arranged opposite each other in the axial direction of the needle stem part, taking into account the metal distribution of the needle material. ), but the reference surface portion 2 and the needle shaft portion may be forged simultaneously without being processed separately.

この場合針幹１に形成される長溝３と短溝４には薄い連
接残壁部６を残して針穴５の部分が仮り形成され、この
連接残壁部６を削除することで貫通した針穴５とするこ
とができるように圧成する。また針幹１の両側にはみ出
した部分即ち耳部分７，７は前記基準面部２の張り出し
寸法より短目になるように考慮され、且つ基準面部２と
耳部分７とが針軸芯を中心として含む同一平面上に形成
配備するのが耳部分７の切削加工に合理的な操作が可能
となる。In this case, a needle hole 5 is temporarily formed in the long groove 3 and short groove 4 formed in the needle stem 1 by leaving a thin connecting residual wall part 6, and by removing this connecting residual wall part 6, the needle penetrates. Pressing is performed so that the hole 5 can be formed. In addition, the portions protruding from both sides of the needle stem 1, that is, the ear portions 7, are designed to be shorter than the protruding dimension of the reference surface portion 2, and the reference surface portion 2 and the ear portion 7 are centered on the needle axis. Forming and arranging the ear portion 7 on the same plane allows for rational cutting of the ear portion 7.

さらに前記基準面部２としては厚さを針幹１の直径より
小さい寸法にして偏平な円形又は楕円形若しくは角形の
平板部に圧成し、針幹１の軸芯部両側に張り出した状態
で設けてあるが、長溝３又は短溝４側に片寄せた状態に
配備したり、片側のみに突出形成させることもでき、い
ずれにしても、プレスで押型形成された基準面部２の両
側を打抜プレス又はカツタで面取りして寸決合せ面２０
を針幹１との軸心線と平行に形成し、該寸法合せ面２０
の一方を枕部１０に載置して第４図及び第５図に示すよ
うに寸法合せ面２０と針幹外周縁とが交互に当接するよ
うに針幹１を枕部１０上にホルダーで軸廻りにころがし
て位置し針幹１の両側に突出する耳部分７をグラインダ
１４に接触させつつ切削し、且つグラインダ１４で削ぎ
取り部１２を針幹１に形成しさらに針幹の貫通抵抗を少
くするための加工即ちえぐり凹部１３を針幹一面に形成
してある。Furthermore, the reference surface portion 2 is formed by pressing into a flat circular, oval, or square plate with a thickness smaller than the diameter of the needle stem 1, and is provided in a state that extends from both sides of the axis of the needle stem 1. However, it can also be arranged in a state where it is offset to the long groove 3 or short groove 4 side, or it can be formed so as to protrude only on one side. Sizing surface 20 by chamfering with a press or cutter
is formed parallel to the axis of the needle stem 1, and the dimension matching surface 20
1 is placed on the pillow part 10, and the needle stem 1 is placed on the pillow part 10 with a holder so that the dimension matching surface 20 and the outer periphery of the needle stem are alternately abutted as shown in FIGS. 4 and 5. The ears 7 that are rolled around the axis and protrude from both sides of the needle stem 1 are cut while being in contact with a grinder 14, and the grinder 14 forms a scraped portion 12 on the needle stem 1 to further reduce the penetration resistance of the needle stem. A recessed portion 13 is formed on the entire surface of the needle stem in order to reduce the number of needles.

前記グラインダ１４は円筒状の砥石を回転自在に備え、
枕部１０に載置され搬送される釘幹１に当接されて針幹
１の切削加工を施すようにしたもので針幹１が回転させ
ながら位置規制を前記基準面部２をもつて行えば所定位
置の切削加工が連続的にできるようになつている。この
場合針幹１に連らなつて存在する柄部１１即ち前記基準
面部２を一端とすると他端側になる所定間隔位置にプレ
スによつて第１０図に示すように一体的に形成される柄
部と前記基準面部２の寸法合せ面２０とを同一平面上に
置いて削ぎ取り部１２，１２を形成するのに役立せるの
が合理的で、寸法合せ面２０の寸法を柄部１１の直径と
同一寸法となることで切削度合の均一化をはかることが
容易に可能となる。なお削ぎ取り部１２，１２はグライ
ンダの位置規制によつて針幹１の所定位置に形成される
。また短溝３の側の針先部に彎曲したえぐり凹部１３を
形成するには、前記基準面部２の位置規制でグラインダ
１４で円弧状に切削されるが、針幹１を枕部１０上にこ
ろがしながら加工する際、巣５図に示すように針幹１の
長溝面側が回転グラインダ１４に対接したときに針幹１
を載置した前記枕部１０が離間方向に移動され針幹外周
縁がグラインダに接触しないようにすれば、長溝３側に
はえぐり凹部１３が形成されないですむ、この場合枕部
１０そのものを移動させてもよいが枕部１０上に搬送さ
れる針幹１が枕部１０のカム面（突出している面：傾斜
面）を移動する際にグラインダ１４に押接されてそぐり
凹部１３を形成してもよい。The grinder 14 is rotatably equipped with a cylindrical grindstone,
The needle stem 1 is cut by being brought into contact with the nail stem 1 placed on the pillow part 10 and conveyed, and the reference surface part 2 is used to regulate the position while the needle stem 1 rotates. Cutting can be performed continuously at predetermined positions. In this case, as shown in FIG. 10, the handle 11 extending from the needle stem 1, that is, the reference surface 2, is integrally formed at a predetermined interval position on the other end side, as shown in FIG. It is reasonable to place the handle and the dimension matching surface 20 of the reference surface section 2 on the same plane to help form the scraped parts 12, 12, and the dimensions of the dimension matching surface 20 are set on the same plane. By making the size the same as the diameter of the cutter, it becomes possible to easily equalize the degree of cutting. Note that the scraped portions 12, 12 are formed at predetermined positions on the needle stem 1 by regulating the position of the grinder. Further, in order to form the curved gouged recess 13 in the needle tip on the side of the short groove 3, cutting is performed in an arc shape with a grinder 14 while regulating the position of the reference surface 2. When processing while rolling, when the long groove side of the needle stem 1 comes into contact with the rotary grinder 14 as shown in Figure 5, the needle stem 1
If the pillow part 10 on which is placed is moved in the separating direction so that the outer peripheral edge of the needle stem does not come into contact with the grinder, there is no need to form the gouged recess 13 on the long groove 3 side.In this case, the pillow part 10 itself can be moved. However, when the needle stem 1 conveyed onto the pillow part 10 moves on the cam surface (projecting surface: inclined surface) of the pillow part 10, it is pressed against the grinder 14 and forms the warped recess 13. You may.

これら切削加工後に前記基準面部２を位置規制用の押え
に活用して針穴５を穿設したのち該基準面部２をカツト
して尖端部１５に研摩加工され、その他ミシン針として
必要な加工処理をして製品化しうるものである。After these cutting processes, the reference surface part 2 is utilized as a presser foot for position regulation to drill a needle hole 5, and then the reference surface part 2 is cut and polished into a tip part 15, and other processing steps necessary for a sewing machine needle are performed. It is possible to commercialize the product by doing the following.

なお針体素材の伸線の直径の決定並びに加工には次のこ
とを考慮するのが利便である。It is convenient to consider the following when determining and processing the drawing diameter of the needle material.

針長溝の中央断面からミシン針完成品の断面積を求めて
決め、針穴部断面の面積は長溝部断面の面積に比較して
若干小さくし前記型押力旺の際で幹外周面よりはみ出す
部分を作つてもよい金属配分とする。これらは型押の際
の伸び分を考慮して選ばれることは勿論で金属素材の材
質の差異によつて順応して決定することができる。なお
針先部分即ち長溝より先端部分は切断してしまうので押
型の際に押え用として利用する耳を出してもよく、従つ
て溝部のみでなく場合によつてはそれ以上の部分まで予
備力旺をしてもさしつかえない。Determine the cross-sectional area of the completed sewing machine needle from the central cross-section of the long groove of the needle, and make the cross-sectional area of the needle hole slightly smaller than the cross-sectional area of the long groove so that it protrudes from the outer peripheral surface of the stem during the embossing process. The metal distribution can be made into parts. These are of course selected in consideration of the amount of elongation during embossing, and can also be determined depending on the difference in the quality of the metal material. Since the tip of the needle, that is, the tip of the long groove, is cut off, a lug that can be used as a presser during pressing can be exposed. Therefore, the reserve force is increased not only in the groove but also in some cases beyond the groove. It's okay to do that.

更に針幹１の針穴５の部分の所は強力なプレス加工を要
するためと、素材の断面積或いは金属配力との関係で耳
部分７を両側に出して加工しやすく圧成する。これは加
工の容易性の向上だけでなく、長溝３、短溝４などの溝
類を必要以上に深くする要がないことや、針穴あけ加工
のための位置決めに活用できる利点もあつて便利である
。そして前記耳部分７は針穴あけ加工或いは研摩加工な
どの際又はそれ以外の時点で削落による事後処理を施し
て針孔部分の外側面をなだらかな外側面に仕上げる。ま
た針体素材が線状体を用い連続的に加工する場合同一方
向連続或いは異方向連続でも適宜選んでできるし、針体
素材はその断面形が円形の丸線或いは異形状の線材を使
用して連続、自動的に加工することができる。針体素材
のシヤンク部分は針柄部の断面積を選び若干の伸びを加
算した線径の線材を用いるのが便利で、丸線の場合面取
り部の両端縁の成型が不完全になりやすいので一応の横
圧を加えて横圧造加工をこの部分まで及ばさせ成型する
のが針の規格に合致させるのに便利である。本発明は、
針穴をつくるべき針尖端部形成予定部分の先端に平坦な
基準面部を針幹外周縁より張り出して型押成形し、この
張り出した基準面部の側端縁をミシン針針幹の軸芯に添
つて平行な面となるように針幹外周縁より外側位置に寸
法合せ面を形成したのち該寸法合せ面を枕部に載置し、
該寸法合せ面と針幹外周縁とが交互に当接するように針
幹を枕部上にころがして変位し回転グラインダによつて
針幹側面に突出した耳部分を切削するとともに針穴穿設
予定部分附近に針幹外周縁より内方にへこんだ凹状の削
ぎ取り部を形成して針穴を長溝と短溝とを貫通する位置
に穿設したのち前記基準面部を切断し、前記針穴部分よ
り先端を尖端部に研摩することにより基準面部を活用し
て各加工作業の規制を行な（／功旺精度を著しく向上し
従来の問題点をも適確に除去でき斜線素材を一定速度で
順次小径部の形成、凹溝、孔の形成、研摩並びに切断を
順次自動的に且つ連続的に行うことができるし、針幹を
そろえて加工する必要がなく運搬過程で順次自動的な加
工を施すことが可能となつて加工に手数がかからず各作
業の自動化によつて細かく煩雑な手作業をなくし効率よ
く合理的な作業が可能となつて、その生産能力の増大と
コスト低減とを容易に可能とし大量生産に適するほ力＼
ミシン針として均質なものに製作でき商品価値を高め
品質管理上極めて有用な製品とすることが可能となる。Furthermore, since the portion of the needle hole 5 of the needle stem 1 requires strong press working, and in relation to the cross-sectional area of the material or metal distribution, the lug portions 7 are exposed on both sides to facilitate press forming. This not only improves the ease of machining, but also has the advantage that there is no need to make grooves such as the long grooves 3 and short grooves 4 deeper than necessary, and that it can be used for positioning for needle drilling. be. Then, the ear portion 7 is subjected to post-processing by scraping at the time of needle hole drilling or polishing, or at any other time to finish the outer surface of the needle hole portion into a smooth outer surface. In addition, if the needle material is a wire material and is processed continuously, it can be processed in the same direction or in different directions as appropriate.The needle material may be a round wire with a circular cross section or a wire material with an irregular shape. It can be processed continuously and automatically. For the shank part of the needle body material, it is convenient to select the cross-sectional area of the needle handle and use a wire with a diameter that has been slightly elongated.If you use round wire, the shaping of both edges of the chamfered part tends to be incomplete. It is convenient to extend the lateral heading process to this part by applying a certain amount of lateral pressure to make it conform to the needle specifications. The present invention
At the tip of the part where the needle point is to be formed, where the needle hole is to be made, a flat reference surface is embossed and overhangs from the outer peripheral edge of the needle shaft, and the side edge of this overhanging reference surface is attached to the axis of the needle shaft of the sewing machine needle. After forming a dimension matching surface at a position outside the outer peripheral edge of the needle shaft so that the surface is parallel to the needle shaft, the dimension matching surface is placed on the pillow part,
The needle shaft is rolled and displaced onto the pillow part so that the dimension matching surface and the outer periphery of the needle shaft come into contact with each other alternately, and a rotary grinder is used to cut the ear portion protruding from the side surface of the needle shaft, and the needle hole is planned to be drilled. A concave scraped part recessed inward from the outer periphery of the needle shaft is formed near the part, and a needle hole is drilled at a position passing through the long groove and the short groove, and then the reference surface part is cut, and the needle hole part is cut. By grinding the tip to a sharp point, the reference surface area is used to control each processing operation (/Koumou Accuracy is significantly improved, the problems of the conventional method can be accurately removed, and the diagonal line material can be processed at a constant speed. Formation of small diameter parts, formation of grooves, holes, polishing, and cutting can be performed automatically and continuously in sequence, and there is no need to align the needle stems and process them, and automatic processing can be performed sequentially during the transportation process. By automating each work, detailed and complicated manual work can be eliminated, making it possible to perform efficient and rational work, increasing production capacity and reducing costs. Power that is easily possible and suitable for mass production＼
It can be made into a homogeneous sewing machine needle, increasing the commercial value and making it an extremely useful product for quality control.

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

図面は本発明の方法の製造工程を示し、第１図は基準面
、押出後の平面図、第２図はその側面図、第３図Ａ，Ｂ
，Ｃ，Ｄはそれぞれ第１図Ａ−Ａ，Ｂ−Ｂ，Ｃ−Ｃ及び
Ｄ−Ｄ線における切断面図、第４図及び第５図は切削工
程の作用切断側面図、第６図は針先倍Ｖ）１Ｊ［ＬＴ．
前の平面図、第７図はその切断側面図、第８図は第６図
１−１線の切断面図、第９図は第６図−線の切断面図、
第１０図は完成品の平面図である。 １・・・・・・針幹、２・・・・・・基準面部、３・・
・・・・長溝、４・・・・・｛溝、５・・・・・・針穴
、６・・・・・・連接残壁部、７・・・・・・耳部分、
１０・・・・・・枕部、１１・・・・・・柄部、１２・
・・・・・削ぎ取り部、１３・・・・・・削り凹音艮
１４・・・・・・グラインダ、１５・・・・・・尖端部
、２０・・・・・・寸法合せ面。The drawings show the manufacturing process of the method of the present invention, FIG. 1 is a reference plane and a plan view after extrusion, FIG. 2 is a side view thereof, and FIGS. 3A and B.
, C, and D are cross-sectional views taken along lines A-A, B-B, CC, and D-D in Figure 1, respectively; Figures 4 and 5 are cross-sectional views of the cutting process; Needle tip times V) 1J [LT.
The front plan view, FIG. 7 is a cut side view thereof, FIG. 8 is a cut sectional view taken along line 1-1 in FIG. 6, FIG. 9 is a cut sectional view taken along line 6-- in FIG.
FIG. 10 is a plan view of the finished product. 1... Needle stem, 2... Reference surface section, 3...
... Long groove, 4 ... {groove, 5 ... needle hole, 6 ... connected remaining wall part, 7 ... ear part,
10... Pillow part, 11... Handle part, 12.
...Shaving part, 13...Shaving concave sound part
14...Grinder, 15...Point, 20...Dimension matching surface.

Claims (1)

【特許請求の範囲】[Claims] １ 針体素材を一対のプレス用押型にて変形させ針幹長
手方向に添つた長溝と短溝とを対向して配備した凹溝付
きのミシン針とするものにおいて、針穴をつくるべき針
尖端部形成予定部分の先端に平坦な基準面部を針幹外周
縁より張り出して型押成形し、この張り出した基準面部
の側端縁をミシン針針幹の軸芯に添つて平行な面となる
ように針幹外周縁より外側位置に寸法合せ面を形成した
のち該寸法合せ面を枕部に載置し、該寸法合せ面と針幹
外周縁とが交互に当接するように針幹を枕部上にころが
して変位し回転グラインダによつて針幹側面に突出した
耳部分を切削するとともに針穴穿設予定部分附近に針幹
外周縁より内方にへこんだ凹状の削ぎ取り部を形成して
針穴を長溝と短溝とを貫通する位置に穿設したのち、前
記基準面部を切断し、前記針穴部分より先端を尖端部に
研摩することを特徴とするミシン針の製造方法。1. In a sewing machine needle with a concave groove formed by deforming the needle material with a pair of pressing dies and having long grooves and short grooves facing each other in the longitudinal direction of the needle stem, the tip of the needle where the needle hole is to be made. At the tip of the part where the part is to be formed, a flat reference surface part is made to protrude from the outer periphery of the needle stem and is molded by embossing, so that the side edge of this protruding reference surface part becomes a plane parallel to the axis of the needle stem of the sewing machine needle. After forming a dimension matching surface at a position outside the outer periphery of the needle shaft, place the dimension matching surface on the pillow part, and place the needle shaft on the pillow part so that the dimension matching surface and the outer periphery of the needle shaft alternately abut. It is rolled upward and displaced, and a rotating grinder cuts off the protruding ear portion on the side of the needle shaft, and forms a concave scraped portion recessed inward from the outer periphery of the needle shaft near the area where the needle hole is to be drilled. A method for manufacturing a sewing machine needle, which comprises: drilling a needle hole at a position penetrating a long groove and a short groove, cutting the reference surface portion, and polishing the tip from the needle hole portion to a pointed end.