JP4679965B2 - Sliding screw device - Google Patents

Sliding screw device Download PDF

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JP4679965B2
JP4679965B2 JP2005145527A JP2005145527A JP4679965B2 JP 4679965 B2 JP4679965 B2 JP 4679965B2 JP 2005145527 A JP2005145527 A JP 2005145527A JP 2005145527 A JP2005145527 A JP 2005145527A JP 4679965 B2 JP4679965 B2 JP 4679965B2
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electroformed
screw
master
electroformed part
nut
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JP2006322514A (en
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文規 里路
功 古森
真史 大熊
健一 三谷
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NTN Corp
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Description

本発明は、回転運動と直線運動相互間で運動変換を行う滑りねじ装置に関する。   The present invention relates to a sliding screw device that performs motion conversion between rotational motion and linear motion.

滑りねじ装置は、主として回転運動を直線運動に変換する用途に用いられ、計測機器、半導体装置、工作機械等の送り装置や位置決め装置などに多く採用されている。この滑りねじ装置において、ナットの摺動特性および強度確保を目的として、雄ねじと同じ形状のコアピンに柔軟な自己潤滑性樹脂組成物からなるパイプを被せ、これを金型に入れて射出成形することにより、その成形圧力でパイプをコアピンの雄ねじに沿わせて変形させた樹脂製ナットが知られている（特許文献１）。
特開平１０−２８１１３２号公報 The slide screw device is mainly used for converting rotational motion into linear motion, and is often used in feeding devices and positioning devices such as measuring instruments, semiconductor devices, and machine tools. In this sliding screw device, in order to ensure the sliding characteristics and strength of the nut, a core pin having the same shape as the male screw is covered with a pipe made of a flexible self-lubricating resin composition, and this is put into a mold and injection molded. Therefore, a resin nut is known in which the pipe is deformed along the male screw of the core pin with the molding pressure (Patent Document 1).
JP-A-10-281132

しかしながら、特許文献１の樹脂製ナットでは、ヒケの発生によりねじ溝精度が低下するおそれがあり、滑りねじ装置の用途によっては、バックラッシュの発生等により、要求される駆動精度を確保できないおそれがある。   However, in the resin nut of Patent Document 1, there is a risk that the thread groove accuracy may be reduced due to the occurrence of sink marks, and depending on the use of the sliding screw device, there is a possibility that the required driving accuracy cannot be ensured due to the occurrence of backlash or the like. is there.

本発明は、高い駆動精度を有し、しかも低コストに製作可能な滑りねじ装置を提供するものである。   The present invention provides a sliding screw device that has high driving accuracy and can be manufactured at low cost.

上記課題を達成するために本発明の滑りねじ装置は、外周に雄ねじを有するねじ軸と、内周に雌ねじを有し、ねじ軸の雄ねじに螺合するナットとからなる滑りねじ装置であって、ナットが、雌ねじを有する電鋳部をインサートした型成形品であり、電鋳部の厚さが１０μｍ〜２００μｍであり、電鋳部が前記雌ねじに対応するねじ部を形成したマスター軸からインサート成形後に分離され、雌ねじがマスター軸のねじ部の形状を転写したものであることを特徴とするものである。 Slide screw device of the present invention in order to achieve the above object includes a screw shaft having a male thread on the outer circumference, the internal thread on the inner periphery, a sliding screw device comprising a nut screwed to the male screw of the screw shaft The nut is a molded product in which an electroformed part having an internal thread is inserted , the electroformed part has a thickness of 10 μm to 200 μm, and the electroformed part is inserted from a master shaft on which a thread part corresponding to the internal thread is formed. It is separated after molding, and the female screw is a transfer of the shape of the threaded portion of the master shaft .

雌ねじを有する電鋳部は、雄ねじ状に形成したマスター表面に金属イオンを電着させることにより金属層を形成する電鋳加工によって形成される。電鋳加工の特性上、電鋳部の内面にはマスターの表面形状がミクロンオーダまで精度よく転写されるので、マスターの表面精度を高めておけば、電鋳加工後は特段の後加工を行うことなく、高い面精度を有する雌ねじが低コストに得られる。また、電鋳加工後は、雌ねじを有する電鋳部をインサートした状態で型成形（インサート成形）することによりナットが製作されるので、その製作工程での部品同士の組み付け作業が不要となり、部品点数の削減および工程を簡略化から低コスト化を図ることができる。   The electroformed part having an internal thread is formed by electroforming which forms a metal layer by electrodepositing metal ions on a master surface formed in the form of an external thread. Due to the characteristics of electroforming, the surface shape of the master is accurately transferred to the micron order on the inner surface of the electroformed part. If the surface accuracy of the master is increased, special post-processing is performed after electroforming. Therefore, an internal thread having high surface accuracy can be obtained at low cost. In addition, after electroforming, nuts are manufactured by molding (insert molding) with an electroformed part having an internal thread inserted, so that assembly work between parts in the manufacturing process becomes unnecessary. The number of points can be reduced and the process can be simplified and the cost can be reduced.

型成形後の成形品からはマスターが分離される。その後、別途製作したねじ軸をナットに螺合することで滑りねじ装置の組み立てが完成する。この他、電鋳部から分離したマスターをそのままねじ軸として使用することもできる。このようにして組み立てた滑りねじ装置は、機械加工では実現困難な高精度の螺合隙間を有するので、大きな予圧を与えなくてもバックラッシュの発生を確実に抑えることができる。従って、低トルクでかつ高い駆動精度を有する滑りねじ装置の提供が可能となる。   The master is separated from the molded product after the molding. Then, the assembly of the sliding screw device is completed by screwing the screw shaft separately manufactured to the nut. In addition, the master separated from the electroformed part can be used as a screw shaft as it is. Since the slide screw device assembled in this way has a high-precision screw gap that is difficult to achieve by machining, the occurrence of backlash can be reliably suppressed without applying a large preload. Therefore, it is possible to provide a sliding screw device having low torque and high driving accuracy.

特に、電鋳部にフランジを設けると、電鋳部を樹脂や金属の型成形でモールドした際、電鋳部のフランジと、これに密着するモールド部との間の抜け止め、あるいは回り止めがなされるので、電鋳部とモールド部との間で高い固着力が得られ、ナットの機械的強度を高めることができる。   In particular, when the electroformed part is provided with a flange, when the electroformed part is molded by resin or metal molding, the flange of the electroformed part and the mold part that is in close contact with the molded part are prevented from coming off or rotating. Since it is made, a high adhering force is obtained between the electroformed part and the mold part, and the mechanical strength of the nut can be increased.

電鋳部のフランジは、電鋳部を塑性変形させることで形成することができる。例えば、マスターの外周に密着した電鋳部の端部を軸方向に加圧すれば、非加圧部はマスターと密着した内径側へ変形することができないため、電鋳部の端部が外径側に塑性変形し、これにより、外向きの一体フランジが容易に形成可能となる。   The flange of the electroformed part can be formed by plastically deforming the electroformed part. For example, if the end of the electroformed part in close contact with the outer periphery of the master is pressed in the axial direction, the non-pressurized part cannot be deformed to the inner diameter side in close contact with the master, so the end of the electroformed part is Plastic deformation is performed on the radial side, whereby an outward integral flange can be easily formed.

電鋳部を型成形にてモールドする際、型締めした金型で電鋳部を部分的に塑性変形させれば、フランジの形成後、そのままキャビティに樹脂や金属を供給することにより、フランジも含めて電鋳部をモールドすることができる。この際、フランジを形成するための特段の加工は不要であり、低コストに高い抜け止めおよび回り止め効果が得られる。   When molding the electroformed part by mold forming, if the electroformed part is partially plastically deformed with a clamped mold, after the flange is formed, the resin can be supplied to the cavity as it is. Including the electroformed part can be molded. At this time, special processing for forming the flange is unnecessary, and a high retaining effect and anti-rotation effect can be obtained at low cost.

本発明の滑りねじ装置は、低トルクでありながら高い駆動精度を有し、これにより従動側の搬送精度や位置決め精度を向上させることができる。   The sliding screw device of the present invention has a high driving accuracy while having a low torque, thereby improving the conveyance accuracy and positioning accuracy on the driven side.

本発明の実施の形態１を、図１〜図６を参考に説明する。   Embodiment 1 of the present invention will be described with reference to FIGS.

滑りねじ装置１は、図１に示すように、外周に雄ねじを有するねじ軸２に、内周に雌ねじを有するナット３を螺合して構成される。ねじ軸２またはナット３の何れか一方をモータ等の駆動力により回転させると、その回転運動が他方の部材の直線運動に変換される。   As shown in FIG. 1, the sliding screw device 1 is configured by screwing a nut 3 having an internal thread on a screw shaft 2 having an external thread on the outer periphery. When either one of the screw shaft 2 or the nut 3 is rotated by a driving force such as a motor, the rotational motion is converted into the linear motion of the other member.

ねじ軸２およびナット３のねじは、例えば角ねじで形成されているが、角ねじに限定されるものでなく、三角ねじ、台形ねじ等のねじであってもよい。   The screws of the screw shaft 2 and the nut 3 are formed by, for example, square screws, but are not limited to square screws, and may be screws such as triangular screws and trapezoidal screws.

ナット３は、図６に示すように、電鋳加工で形成された金属製の電鋳部４と、この電鋳部４をモールドする樹脂製のモールド部６とから構成される。   As shown in FIG. 6, the nut 3 includes a metal electroformed part 4 formed by electroforming, and a resin mold part 6 that molds the electroformed part 4.

このナット３は、マスター７の所要箇所をマスキングする工程（図２参照）、非マスク部に電鋳加工を行って電鋳軸８を形成する工程（図３参照）、電鋳軸８をインサートして樹脂で型成形する工程（図４、図５参照）、および電鋳部４とマスター７とを分離する工程を経て製作される。   The nut 3 includes a step of masking a required portion of the master 7 (see FIG. 2), a step of forming an electroformed shaft 8 by electroforming the non-masked portion (see FIG. 3), and inserting the electroformed shaft 8 Thus, it is manufactured through a process of molding with resin (see FIGS. 4 and 5) and a process of separating the electroformed part 4 and the master 7.

マスター７は、導電性材料、例えばステンレス鋼に焼入れ等の熱処理を施したもので、その中程の外周には、ナット３内周の雌ねじ５（図３参照）形状に対応したねじ部９が形成されている。電鋳部１０の成形性が良好であれば、ステンレス鋼以外の金属材料、例えばニッケル合金やクロム合金なども使用することもできる。セラミック等の非金属材料でも、導電処理を施すことにより（例えば表面に導電性の金属被膜を形成することにより）、マスター７として使用可能となる。なお、マスター７の表面には、滑りねじ装置１としての使用時に電鋳部４との間の摩擦力を減じるための表面処理、例えばフッソ系の樹脂コーティングを施すのが望ましい。   The master 7 is a conductive material such as stainless steel that has been subjected to a heat treatment such as quenching. A screw portion 9 corresponding to the shape of the internal thread 5 (see FIG. 3) of the inner periphery of the nut 3 is provided at the middle outer periphery thereof. Is formed. If the formability of the electroformed part 10 is good, a metal material other than stainless steel, for example, a nickel alloy or a chromium alloy can also be used. Even a non-metallic material such as ceramic can be used as the master 7 by conducting a conductive treatment (for example, by forming a conductive metal film on the surface). The surface of the master 7 is preferably subjected to a surface treatment for reducing the frictional force with the electroformed part 4 when used as the sliding screw device 1, for example, a fluorine-based resin coating.

マスター７に形成したねじ部９の精度は、ナット３に形成する雌ねじ５の精度を直接左右する。従って、マスター７のねじ部９は、ピッチ、リード、リード角、山部や谷部の外径寸法、表面粗さ等のねじとして機能上重要となる精度を予め高精度に仕上げておく必要がある。   The accuracy of the screw portion 9 formed on the master 7 directly affects the accuracy of the female screw 5 formed on the nut 3. Therefore, the threaded portion 9 of the master 7 needs to be finished with high precision in advance, which is functionally important as a screw such as pitch, lead, lead angle, crest and trough outer diameter, surface roughness and the like. is there.

マスター７の外周面には、図２に示すように、電鋳部４の成形予定部（ねじ部９とその周辺）を除き、マスキングが施されている（マスキング部位をクロスハッチングで示す）。マスキング用の被覆材１０としては、非導電性、および電解質溶液に対する耐食性を有する既存品が選択される。   As shown in FIG. 2, masking is performed on the outer peripheral surface of the master 7 except for a portion to be molded (the screw portion 9 and its surroundings) of the electroformed portion 4 (masking portions are indicated by cross-hatching). As the masking covering material 10, an existing product having non-conductivity and corrosion resistance against the electrolyte solution is selected.

電鋳加工は、ＮｉやＣｕ等の金属イオンを含んだ電解質溶液にマスター７を浸漬し、電解質溶液に通電して目的の金属をマスター７の表面に析出させることにより行われる。電解質溶液には、カーボンなどの摺動材、あるいはサッカリン等の応力緩和材を必要に応じて含有させてもよい。電着金属の種類は、ナット３の雌ねじ５に求められる硬度、疲れ強さ等の物理的性質、化学的性質に応じて適宜選択される。電鋳部の厚みは、厚すぎるとマスター７からの剥離性が低下し、薄すぎると雌ねじ５の耐久性低下等につながるが、この厚みが１０μｍ〜２００μｍの範囲であれば、上記弊害を防止することができる。   Electroforming is performed by immersing the master 7 in an electrolyte solution containing metal ions such as Ni and Cu, and energizing the electrolyte solution to deposit the target metal on the surface of the master 7. If necessary, the electrolyte solution may contain a sliding material such as carbon or a stress relaxation material such as saccharin. The type of electrodeposited metal is appropriately selected according to physical properties and chemical properties such as hardness and fatigue strength required for the internal thread 5 of the nut 3. If the thickness of the electroformed part is too thick, the peelability from the master 7 is lowered, and if it is too thin, the durability of the female screw 5 is lowered. However, if this thickness is in the range of 10 μm to 200 μm, the above-described adverse effects are prevented. can do.

以上の工程を経ることにより、図３に示すように、マスター７の外周のねじ部９とその周辺領域に電鋳殻としての電鋳部４を被着した電鋳軸８が製作される。   By passing through the above process, as shown in FIG. 3, the electroformed shaft 8 which manufactured the screw part 9 of the outer periphery of the master 7 and the electroformed part 4 as an electroformed shell in the peripheral area | region is manufactured.

電鋳軸８は図４及び図５に示す電鋳部４のモールド工程に移送され、電鋳部４およびマスター７をインサート部品とするインサート成形が行われる。   The electroformed shaft 8 is transferred to the molding process of the electroformed part 4 shown in FIGS. 4 and 5, and insert molding is performed using the electroformed part 4 and the master 7 as insert parts.

モールド工程では、電鋳軸８は、図４に示すようにその軸方向を型締め方向（図面上下方向）と平行にして、上型１１，および下型１２からなる金型内部に供給される。下型１２には、マスター７の外径寸法に適合した位置決め穴１３が形成され、この位置決め穴１３に前工程から移送した電鋳軸８の下端を挿入して電鋳軸８の位置決めがなされる。   In the molding step, the electroformed shaft 8 is supplied into the mold composed of the upper mold 11 and the lower mold 12 with its axial direction parallel to the mold clamping direction (the vertical direction in the drawing) as shown in FIG. . The lower mold 12 is formed with a positioning hole 13 adapted to the outer diameter of the master 7, and the lower end of the electroformed shaft 8 transferred from the previous process is inserted into the positioning hole 13 to position the electroformed shaft 8. The

この位置決め状態では、電鋳軸８のうち電鋳部４の下端面が下型１２の成形面と係合し、電鋳部４の上端が金型のパーテイングラインＰ．Ｌ．よりも相手型（本実施の形態では上型１１）の側に突出している。この位置決め穴１３の深さＬ１は、マスター７の下端と電鋳部４の下端との間の距離Ｌ２よりも大きい（Ｌ１＞Ｌ２）。したがって、型締めの前の状態では、マスター７の下端面は位置決め穴１３の底から浮上した状態にある。この浮上量を調整することで、電鋳部４の下端に形成するフランジ１４の塑性変形量を変更することができる。   In this positioning state, the lower end surface of the electroformed part 4 of the electroformed shaft 8 is engaged with the molding surface of the lower mold 12, and the upper end of the electroformed part 4 is the parting line P.D. L. Rather than the other mold (upper mold 11 in this embodiment). The depth L1 of the positioning hole 13 is larger than the distance L2 between the lower end of the master 7 and the lower end of the electroformed part 4 (L1> L2). Therefore, in a state before mold clamping, the lower end surface of the master 7 is in a state of floating from the bottom of the positioning hole 13. By adjusting the flying height, the plastic deformation amount of the flange 14 formed at the lower end of the electroformed part 4 can be changed.

前記上型１１には、位置決め穴１３と同軸にガイド穴１５が形成されている。このガイド穴１５の深さＬ３は図５に示す型締め時において、マスター７の上端がガイド穴１５の底に突き当たらない程度であれば足りる（なお、マスター７の下端は位置決め穴１３の底に突き当たる）。   A guide hole 15 is formed coaxially with the positioning hole 13 in the upper mold 11. The depth L3 of the guide hole 15 is sufficient as long as the upper end of the master 7 does not hit the bottom of the guide hole 15 at the time of clamping shown in FIG. 5 (the lower end of the master 7 is the bottom of the positioning hole 13). Hits).

以上の金型において、可動型（本実施形態でいえば上型１１）を固定型（本実施形態でいえば下型１２）に接近させて型決めをすると、まずマスター７の上端がガイド穴１５に挿入されてマスター７の芯出しが行われ、さらに、上型１１の成形面に電鋳部４の上側端面が当接する。   In the above molds, when the movable mold (the upper mold 11 in this embodiment) is brought close to the fixed mold (the lower mold 12 in this embodiment), the upper end of the master 7 is first guided by the guide hole. 15, the master 7 is centered, and the upper end surface of the electroformed portion 4 comes into contact with the molding surface of the upper mold 11.

さらなる上型１１の接近で電鋳軸８の全体が下方に押し込まれ、下型１２の成形面と当接した電鋳部４の下端部、および上型１１の成形面と当接した電鋳部４の上端部がそれぞれ外径側に塑性変形し、図５に示すように電鋳部４の軸方向両端にフランジ１４が形成される。金型構造を変更することにより、電鋳部４の軸方向一端にのみフランジ１４を形成することも可能である。   When the upper die 11 is further approached, the entire electroformed shaft 8 is pushed downward, and the lower end portion of the electroformed portion 4 that is in contact with the molding surface of the lower die 12 and the electroforming that is in contact with the molding surface of the upper die 11. The upper ends of the parts 4 are plastically deformed to the outer diameter side, and flanges 14 are formed at both ends in the axial direction of the electroformed part 4 as shown in FIG. It is also possible to form the flange 14 only at one axial end of the electroformed part 4 by changing the mold structure.

型締め完了後、スプール１６、ランナ１７、およびゲート１８を介してキャビティ１９に樹脂材料を射出し、インサート成形を行う。樹脂材料は、例えば液晶ポリマー（ＬＣＰ）、ポリフェニレンサルファイド（ＰＰＳ）樹脂、ポリアセレータ樹脂、ポリアミド樹脂等の高機能結晶性ポリマーが使用可能である。もちろんこれらは例示にすぎず、既存の各種樹脂材料の中から滑りねじ装置１の用途や使用環境に適合した樹脂材料が選択され得る。必要に応じて強化材（繊維状、粉末状等の形状は問わない）や潤滑材、導電化剤等の各種充填材を加えてもよい。   After completion of the mold clamping, a resin material is injected into the cavity 19 through the spool 16, the runner 17, and the gate 18, and insert molding is performed. As the resin material, for example, a highly functional crystalline polymer such as a liquid crystal polymer (LCP), a polyphenylene sulfide (PPS) resin, a polyacetator resin, a polyamide resin, or the like can be used. Of course, these are merely examples, and a resin material suitable for the application and use environment of the sliding screw device 1 can be selected from various existing resin materials. You may add various fillers, such as a reinforcing material (regardless of shapes, such as a fiber form and a powder form), a lubrication material, and a electrically conductive agent as needed.

型開き後、脱型した成形品は、マスター７、電鋳部４、およびモールド部６が一体となった構造となる。   After the mold opening, the molded product removed from the mold has a structure in which the master 7, the electroformed part 4, and the mold part 6 are integrated.

この成形品は、その後分離工程に移送され、電鋳部４およびモールド部６からなるナット３（図６参照）と、マスター７とに分離される。この分離工程は、例えばマスター７やモールド部６に衝撃を加えることにより、電鋳金属組織中の拡径方向の残留応力を解放させ、電鋳部４の内径を拡径させることにより行うことができる。これにより、電鋳部４の雌ねじ５とマスター７のねじ部９との間に、半径寸法で１μｍ〜数十μｍ程度の微少隙間が形成されるため、マスター７を回転させれば、マスター７をナット３から分離することが可能となる。電鋳部４とマスター７とを加熱（又は冷却）し、両者間の熱膨張量差で微少隙間を形成してマスター７をナット３から分離することもできる。さらには、上記衝撃力の付与と熱膨張量差の付与とを併用してマスター７を分離しても構わない。   This molded product is then transferred to a separation step, and separated into a nut 3 (see FIG. 6) composed of an electroformed part 4 and a mold part 6 and a master 7. This separation step can be performed, for example, by releasing residual stress in the diameter expansion direction in the electroformed metal structure and expanding the inner diameter of the electroformed part 4 by applying an impact to the master 7 or the mold part 6. it can. As a result, a minute gap having a radial dimension of about 1 μm to several tens of μm is formed between the female screw 5 of the electroformed part 4 and the screw part 9 of the master 7. Can be separated from the nut 3. It is also possible to heat (or cool) the electroformed part 4 and the master 7 and form a minute gap due to the difference in thermal expansion between them to separate the master 7 from the nut 3. Furthermore, you may isolate | separate the master 7 using the provision of the said impact force and the provision of the difference in thermal expansion amount together.

次いで、ナット３の内周にねじ軸２を挿入し、電鋳部４内周の雌ねじ５とねじ軸２外周の雄ねじとを螺合させることにより、図１に示す滑りねじ装置１が構成される。ねじ軸２としては、分離したマスター７をそのまま使用することができ、あるいはマスター７とは別に製作したねじ軸を使用することも可能である。前者の場合は、ナット３の雌ねじ５の精度がねじ軸２の雄ねじ（マスター７のねじ部９）の精度と対応するのでその後のマッチング作業が不要となり、後者であればマスター７が繰り返し転用可能となるメリットが得られる。   Next, the screw shaft 2 is inserted into the inner periphery of the nut 3, and the internal thread 5 on the inner periphery of the electroformed part 4 and the external screw on the outer periphery of the screw shaft 2 are screwed together, whereby the sliding screw device 1 shown in FIG. The As the screw shaft 2, the separated master 7 can be used as it is, or a screw shaft manufactured separately from the master 7 can be used. In the former case, the accuracy of the female screw 5 of the nut 3 corresponds to the accuracy of the male screw of the screw shaft 2 (the threaded portion 9 of the master 7), so that the subsequent matching work is unnecessary, and in the latter case, the master 7 can be repeatedly transferred. The merit that becomes is obtained.

また、本発明では電鋳部４をインサートして型成形するので、キャビティ形状の変更を通じて任意形状のモールド部６を簡単に成形することができ、ナット３について高い形状自由度を確保することができる。例えば図１に示すように、フランジ３ａをナット３に一体形成することができ、これにより部品点数や組立工数の削減による低コスト化も図ることができる。   Further, in the present invention, since the electroformed part 4 is inserted and die-molded, the mold part 6 having an arbitrary shape can be easily formed by changing the cavity shape, and a high degree of freedom in shape can be secured for the nut 3. it can. For example, as shown in FIG. 1, the flange 3 a can be integrally formed with the nut 3, thereby reducing costs by reducing the number of parts and the number of assembly steps.

なお、この滑りねじ装置１は、無給油で使用する他、ねじ軸２とナット３の螺合隙間に油等の潤滑剤を供給して使用することもできる。   The sliding screw device 1 can be used without being lubricated, or by supplying a lubricant such as oil into the screwing gap between the screw shaft 2 and the nut 3.

特に本実施形態のように電鋳部４にフランジ１４，１４を形成し、フランジ１４，１４も含めてナット３をインサート成形すれば、電鋳部４とモールド部６との間でより確実な抜け止めがなされる。   In particular, when the flanges 14 and 14 are formed in the electroformed part 4 and the nut 3 is insert-molded including the flanges 14 and 14 as in the present embodiment, a more reliable relationship between the electroformed part 4 and the mold part 6 is obtained. A retaining is made.

また、図４および図５に示す実施の形態のように、電鋳部４を塑性変形させてフランジ１４を形成する場合、図１に示すように、その外周面の形状は、ランダムな凹凸を有する非真円形状となるので、より高い回り止め効果が得られる。滑りねじ装置１の用途によっては、フランジ１４なしでも十分な回り止め、抜け止め効果が得られる場合もあるので、その場合にはフランジ１４を省略しても構わない。なお、図１では、外周面２０の凹凸が理解の容易化のため誇張して描いている。   4 and 5, when the flange 14 is formed by plastic deformation of the electroformed part 4, the shape of the outer peripheral surface has random irregularities as shown in FIG. Since it has a non-round shape, a higher anti-rotation effect can be obtained. Depending on the application of the slide screw device 1, a sufficient anti-rotation and retaining effect may be obtained without the flange 14, and in that case, the flange 14 may be omitted. In FIG. 1, the unevenness of the outer peripheral surface 20 is exaggerated for easy understanding.

以上の説明では、電鋳部４を樹脂材料でモールドしたが、樹脂に限らず、金属の射出成形、例えばマグネシウム合金やアルミニウム合金等の低融点金属を射出して電鋳部４をモールドすることもできる。その場合、樹脂を使用する場合に比べ、強度、耐熱性、または導電性等の面より、優れた摺動部材３及び滑りねじ装置１が得られる。この他ＭＩＭ成形により電鋳部４をインサート成形でモールドすることもできる。   In the above description, the electroformed part 4 is molded with a resin material. However, the electroformed part 4 is not limited to resin, but injection molding of metal, for example, injection of a low melting point metal such as magnesium alloy or aluminum alloy to mold the electroformed part 4. You can also. In that case, compared with the case where resin is used, the sliding member 3 and the sliding screw device 1 which are superior in terms of strength, heat resistance, conductivity, etc. are obtained. In addition, the electroformed part 4 can be molded by insert molding by MIM molding.

次に、以上に説明した滑りねじ装置を搬送装置に適用した実施の形態２を図７、図８に基づいて説明する。   Next, a second embodiment in which the above-described sliding screw device is applied to a conveying device will be described with reference to FIGS.

図７、図８は、搬送装置３１の一例として、例えばＣＤ−ＲＯＭ（コンパクトディスク・リードオンリーメモリ）やＤＶＤ（デジタル・ビデオディスク）等のディスク駆動装置に装備されるキャリッジ３５の搬送用として用いられるものを示す。   7 and 8 are used as an example of the transport device 31 for transporting a carriage 35 provided in a disk drive device such as a CD-ROM (compact disk / read only memory) or DVD (digital video disk). It shows what is done.

この搬送装置３１では、平行に配置した２本のガイド部材３３、３４のうち、一方３３がねじ軸となり、他方３４が案内軸となる。キャリッジ３５には、ねじ軸３３に螺合する二つのナット部３６が軸方向に離隔させて形成されると共に、案内軸３４を支持する軸受部３９が形成されている。ねじ軸３３に連結した図示しないモータを駆動することにより、その回転運動がキャリッジ３５の軸方向スライド運動に変換され、キャリッジ３５に搭載した読み取り（もしくは書き込み）ヘッド３２の走査が行われる。   In the transport device 31, one of the two guide members 33, 34 arranged in parallel is the screw shaft and the other 34 is the guide shaft. The carriage 35 is formed with two nut portions 36 that are screwed to the screw shaft 33 so as to be separated from each other in the axial direction, and a bearing portion 39 that supports the guide shaft 34 is formed. By driving a motor (not shown) connected to the screw shaft 33, the rotational motion is converted into an axial slide motion of the carriage 35, and the reading (or writing) head 32 mounted on the carriage 35 is scanned.

各ナット部３６および軸受部３９には電鋳部４０，４２が形成されている。このうち、ナット部３６の電鋳部４０内周面には、ねじ軸３３に対応した雌めじが形成され、軸受部３９の電鋳部４２内周面は円筒面状に形成されている。また、各電鋳部４０，４２の軸方向両端には、それぞれ塑性変形によるフランジ部４２，４３が形成されている。各電鋳部４０，４２は、フランジ部４２，４３も含め、樹脂材料等からなるモールド部４４で一体にモールドされている。   Electroformed portions 40 and 42 are formed in each nut portion 36 and bearing portion 39. Among them, a female thread corresponding to the screw shaft 33 is formed on the inner peripheral surface of the electroformed portion 40 of the nut portion 36, and the inner peripheral surface of the electroformed portion 42 of the bearing portion 39 is formed in a cylindrical surface shape. Further, flange portions 42 and 43 are formed by plastic deformation at both ends in the axial direction of the electroformed portions 40 and 42, respectively. Each electroformed part 40, 42 is integrally molded by a mold part 44 made of a resin material or the like including the flange parts 42, 43.

このキャリッジ３５は、上記実施形態と同様の手順、すなわち、電鋳加工により各電鋳部４０，４２を形成する工程、電鋳加工後に各電鋳軸をインサートして樹脂材料等で型成形する工程、さらに電鋳部４０，４２をマスターと分離する工程を経て製作される。この場合、ねじ軸３３および案内軸３４としては、マスターもしくは別途製作した別部材の何れもが使用可能である。   The carriage 35 has the same procedure as that of the above embodiment, that is, a step of forming the electroformed parts 40 and 42 by electroforming, and after electroforming, inserts each electroformed shaft and molds it with a resin material or the like. It is manufactured through a process and a process of separating the electroformed parts 40 and 42 from the master. In this case, as the screw shaft 33 and the guide shaft 34, either a master or another member manufactured separately can be used.

この構成においても、上記実施形態と同様に、ナット部３６に形成された電鋳部４０内周の雌ねじと、ねじ軸３３の外周二形成された雄ねじとの間で高精度の螺合隙間が得られるので、低トルク化を図りつつキャリッジ３５の搬送精度および位置決め精度を高めることができ、これにより情報記録・再生機能の向上を図ることができる。   Also in this configuration, as in the above-described embodiment, there is a high-precision screwing gap between the internal thread formed on the inner periphery of the electroformed portion 40 formed on the nut portion 36 and the external thread formed on the outer periphery of the screw shaft 33. As a result, the conveyance accuracy and positioning accuracy of the carriage 35 can be increased while reducing the torque, thereby improving the information recording / reproducing function.

なお、以上に説明した滑りねじ装置は、上記キャリッジの搬送用に限らず、ワーク、治具、工具等の搬送用あるいは送り用の装置として広く適用することが可能である。また、ねじ軸をモータ等で駆動する場合に限らず、ナットを駆動する場合にも適用することができる。   The sliding screw device described above is not limited to the above-described carriage conveyance, and can be widely applied as an apparatus for conveying or feeding workpieces, jigs, tools, and the like. Further, the present invention can be applied not only when the screw shaft is driven by a motor or the like but also when a nut is driven.

本発明の実施の形態１を示す滑りねじ装置の斜視図である。It is a perspective view of the sliding screw device which shows Embodiment 1 of this invention. 本発明の実施の形態１で電鋳部を形成する時のマスターの斜視図である。It is a perspective view of a master when forming an electroformed part in Embodiment 1 of the present invention. 図２のマスターに電鋳部を形成した電鋳軸の断面図である。It is sectional drawing of the electroformed shaft which formed the electroformed part in the master of FIG. 本発明の射出成形金型に電鋳軸を取付けた状態を説明する断面図である。It is sectional drawing explaining the state which attached the electroformed shaft to the injection molding die of this invention. 本発明の射出成形金型による型締め状態を示す断面図である。It is sectional drawing which shows the clamping state by the injection mold of this invention. 本発明のナットの断面図である。It is sectional drawing of the nut of this invention. 本発明の滑りねじ装置を使用した搬送装置の正面図である。It is a front view of the conveying apparatus using the sliding screw apparatus of this invention. 本発明の搬送装置の一部切欠き平面図である。It is a partially notched top view of the conveying apparatus of this invention.

符号の説明Explanation of symbols

１ 滑りねじ装置
２，２３ 雄ねじ
３，２５ 摺動部材
４，３０，３２，３４ 電鋳部
５，２９ 雌ねじ
６ モールド部
７ マスター
８ 電鋳軸
９ ねじ部
１０ 被覆材
１１ 上型
１２ 下型
１３ 位置決め穴
１４ フランジ
１５ ガイド穴
１９ キャビテイ
２０ 外周面
３１ 搬送装置 DESCRIPTION OF SYMBOLS 1 Sliding screw device 2,23 Male screw 3,25 Sliding member 4,30,32,34 Electroformed part 5,29 Female screw 6 Mold part 7 Master 8 Electroformed shaft 9 Screw part 10 Cover material 11 Upper mold 12 Lower mold 13 Positioning hole 14 Flange 15 Guide hole 19 Cavity 20 Outer peripheral surface 31 Conveying device

Claims (4)

外周に雄ねじを有するねじ軸と、内周に雌ねじを有し、ねじ軸の雄ねじに螺合するナットとからなる滑りねじ装置であって、ナットが、雌ねじを有する電鋳部をインサートした型成形品であり、電鋳部の厚さが１０μｍ〜２００μｍであり、電鋳部が前記雌ねじに対応するねじ部を形成したマスター軸からインサート成形後に分離され、雌ねじがマスター軸のねじ部の形状を転写したものであることを特徴とする滑りねじ装置。 A sliding screw device comprising a screw shaft having a male screw on the outer periphery and a nut having a female screw on the inner periphery and screwed to the male screw of the screw shaft , wherein the nut inserts an electroformed part having the female screw The electroformed part has a thickness of 10 μm to 200 μm, and the electroformed part is separated after the insert molding from the master shaft on which the thread part corresponding to the female screw is formed, and the female screw has the shape of the threaded part of the master shaft. A sliding screw device characterized by being transferred . 電鋳部にフランジを形成したことを特徴とする請求項１に記載の滑りねじ装置。   The sliding screw device according to claim 1, wherein a flange is formed in the electroformed part. フランジが電鋳部の塑性変形によって形成されたことを特徴とする請求項２に記載の滑りねじ装置。   The sliding screw device according to claim 2, wherein the flange is formed by plastic deformation of the electroformed part. 請求項１〜３の何れか一項記載の滑りねじ装置を備える搬送装置。   A conveying apparatus comprising the sliding screw device according to claim 1.
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JP2000074172A (en) * 1998-08-26 2000-03-07 Thk Co Ltd Molding nut, manufacture of molding nut, and linear guide device using molding nut
JP2003056552A (en) * 2001-08-09 2003-02-26 Akutowan:Kk Resin-made bearing part and method for manufacturing the same

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JPH07336991A (en) * 1994-06-15 1995-12-22 Matsushita Electric Ind Co Ltd Lead screw stepping motor and resin molded lead screw thereof
JP3408665B2 (en) * 1995-06-19 2003-05-19 Ｔｈｋ株式会社 Ball screw device and manufacturing method thereof
JP3818749B2 (en) * 1996-08-27 2006-09-06 Ｎｔｎ株式会社 Screw drive device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000074172A (en) * 1998-08-26 2000-03-07 Thk Co Ltd Molding nut, manufacture of molding nut, and linear guide device using molding nut
JP2003056552A (en) * 2001-08-09 2003-02-26 Akutowan:Kk Resin-made bearing part and method for manufacturing the same

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