JPH0763893B2 - Cutting method of screw shaft for ball screw - Google Patents
Cutting method of screw shaft for ball screwInfo
- Publication number
- JPH0763893B2 JPH0763893B2 JP63329095A JP32909588A JPH0763893B2 JP H0763893 B2 JPH0763893 B2 JP H0763893B2 JP 63329095 A JP63329095 A JP 63329095A JP 32909588 A JP32909588 A JP 32909588A JP H0763893 B2 JPH0763893 B2 JP H0763893B2
- Authority
- JP
- Japan
- Prior art keywords
- cutting
- screw
- screw shaft
- thread groove
- shape
- 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 - Lifetime
Links
Landscapes
- Turning (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、ねじ軸のねじ部を切削加工する方法に関す
る。より詳細には、NC旋盤とバイトを使用して、特に、
ボールねじのねじ軸のようなねじ軸を、精度よく切削加
工する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cutting a thread portion of a screw shaft. More specifically, using an NC lathe and bite,
The present invention relates to a method of accurately cutting a screw shaft such as a screw shaft of a ball screw.
従来技術及びその課題 従来、前記のようなねじ軸を切削する方法には、旋盤を
用いて総形バイトの形状を模写させて切削する方法と、
マッハ装置を使用して倣い切削する方法とがある。前者
では、総形バイトの形状精度が悪いと、また総形バイト
のセッテイング位置が悪いと、ねじの形状精度も悪くな
る問題がある。しかし、セッティング位置を精度よく設
定するには、高度の技術を必要とする。また、総形バイ
トの欠け及び摩耗により、ねじ部の形状がくずれ、精度
が悪くなるという問題もある。さらに、最終仕上時には
ねじ部全面を総形バイトで切削することになり、切削抵
抗が大きくなって、ねじ軸の剛性も有るので、びびりが
発生したりして良好な面粗度を得ることができなかっ
た。Conventional technology and its problems Conventionally, the method for cutting the screw shaft as described above includes a method of copying the shape of a forming tool using a lathe and cutting the same.
There is a method of copying and cutting using a Mach device. In the former, there is a problem that if the shape accuracy of the forming tool is poor, and if the setting position of the forming tool is bad, the shape accuracy of the screw is also deteriorated. However, advanced technology is required to set the setting position with high accuracy. There is also a problem in that the shape of the threaded portion is broken due to chipping and wear of the general-purpose tool, resulting in poor accuracy. In addition, at the time of final finishing, the entire surface of the screw part is cut with a tool bit, which increases the cutting resistance and the rigidity of the screw shaft, which can cause chattering and good surface roughness. could not.
前記マッハ装置では、第７図及び第８図に示すように、
モータ29で回転されるバイトホルダ30にその中心孔31内
に先端を突出させて複数のバイト32を等間隔に固定し、
ねじ加工すべき工作物33の中心軸に対して中心孔31を偏
心させ、且つねじ溝のリード角をもって工作物33に対し
て傾斜させた状態でバイトホルダ30を回転させつつ工作
物33を図示しない親ねじで軸方向に送ってねじ溝を切削
形成する。マッハ装置を用いた場合は、加工中にねじ軸
が撓んでびびりを生じ、良好な面粗度が得られないとい
う問題がある。In the Mach device, as shown in FIGS. 7 and 8,
The tool holder 30 rotated by the motor 29 has its tip projected into the center hole 31 to fix the plurality of tool bits 32 at equal intervals,
The work 33 is illustrated while rotating the bite holder 30 in a state in which the center hole 31 is eccentric with respect to the center axis of the work 33 to be threaded and is inclined with respect to the work 33 with the lead angle of the thread groove. Do not feed the screw thread in the axial direction to form a thread groove. When the Mach device is used, there is a problem that the screw shaft bends during processing and chatters, and a good surface roughness cannot be obtained.
また、共通の問題として、切削時の工具の摩耗による精
度低下が避けられない。Further, as a common problem, it is unavoidable that accuracy is deteriorated due to wear of the tool during cutting.
課題を解決するための手段 本発明は、ねじ軸のねじ溝を荒削りし、NC旋盤に前記ね
じ軸を取付けて回転させてピッチ送りし、前記ねじ溝の
仕上形状の断面外縁を微小分割した点群を該点群が夫々
形成するねじ溝と平行の螺旋経路に沿って切削するよ
う、前記点群の位置をあらかじめ記憶した前記NC旋盤に
より数値制御される切削部のねじ軸方向の幅が前記点群
の間隔程度の小幅な尖った形状のバイトでねじ溝を前記
仕上形状に倣い切削させる、ねじ軸の切削加工方法によ
り前記課題を解決した。Means for Solving the Problems The present invention roughly cuts a screw groove of a screw shaft, rotates the screw shaft by attaching the screw shaft to an NC lathe, and pitch-feeds the finely divided cross-section outer edge of the finish shape of the screw groove. The width of the cutting portion in the screw axis direction is numerically controlled by the NC lathe that stores the position of the point group in advance so as to cut the group along a spiral path parallel to the screw groove formed by the point group. The above-mentioned problems are solved by a method of cutting a screw shaft, in which a threaded groove having a sharp shape with a small width of about the distance between the point groups is used to cut the thread groove in accordance with the finish shape.
作用 バイトは、ねじ溝の仕上形状の断面を所望の精度に応じ
た程度で微小分割した各点群に向かって何回も切り込ま
れ、その軌跡の集積が最終的にねじ溝の仕上形状とな
る。バイトは僅かな容積を切削するだけであるから、切
削抵抗も低くびびりも生じないので、ねじ溝は得るべき
仕上形状を高精度で形成される。The action bite is cut many times toward each point group into which the cross section of the finish shape of the thread groove is minutely divided according to the desired accuracy, and the accumulation of the locus finally becomes the finish shape of the thread groove. Become. Since the cutting tool only cuts a small volume, cutting resistance is low and chatter does not occur, so that the thread groove is formed with a high precision in the finished shape to be obtained.
実施例 以下、図面を参照し、本発明によるボールねじ用ねじ軸
の切削加工方法を説明する。Example Hereinafter, a method of cutting a screw shaft for a ball screw according to the present invention will be described with reference to the drawings.
まず、第４図乃至第６図に順次示すように、素材を適宜
の長さに切断して棒材10とし、この棒材10にNC旋盤装着
用のセンタ穴12を加工し、ねじ溝14の荒削りを行い、第
６図に示すねじ軸の中間加工品11を得る。First, as shown in FIG. 4 to FIG. 6 sequentially, the material is cut into an appropriate length to form a bar material 10, and a center hole 12 for mounting an NC lathe is machined in the bar material 10 to form a thread groove 14 Rough cutting is performed to obtain an intermediate processed product 11 of the screw shaft shown in FIG.
前記工程後における中間加工品11は、そのねじ溝14の断
面が、第１図で符号14bで示されるように、仕上形状の
ねじ溝14a近くまで切削されており、ねじ溝14aは周知の
ように円弧面が山形に向き合つた形状を有する。In the intermediate processed product 11 after the above step, the cross section of the thread groove 14 is cut to near the finish shape thread groove 14a as shown by reference numeral 14b in FIG. 1, and the thread groove 14a is well known. Has a shape in which the arc surfaces face each other in a mountain shape.
最終的には、第１図において実線で示されるようなねじ
溝14aが形成されなければならないが、そのため、ま
ず、第２図に示すように、中間加工品11を、NC旋盤20の
主軸22,24に取付け、主軸22,24を回転させながらねじ軸
のねじピッチで軸方向に送る。Finally, the thread groove 14a as shown by the solid line in FIG. 1 must be formed. Therefore, as shown in FIG. 2, first, the intermediate processed product 11 is transferred to the spindle 22 of the NC lathe 20. , 24, and while rotating the main shafts 22, 24, feed them in the axial direction at the screw pitch of the screw shaft.
NC旋盤20の刃物台26にはバイト28が取付けられている。
従来のバイトは総形であるが、本発明で使用するバイト
28は、後述するように各点群を求めて切削するのである
から、総形にする必要がなく普通の尖った形状でよく、
市場で容易に入手可能なバイトである。ねじ溝の形状に
合致するように別途成形することも不要である。A tool 28 is attached to a tool rest 26 of the NC lathe 20.
The conventional tool is a general tool, but the tool used in the present invention
Since 28 is used for cutting after obtaining each point group as described later, it is not necessary to make it a general shape, and an ordinary pointed shape may be used.
It is a byte that is easily available on the market. It is not necessary to separately mold it so as to match the shape of the thread groove.
バイト28は、数値制御（NC）により、回転しながらピッ
チ送りされる中間加工品11の荒仕上されたねじ溝14を何
回も切り込む。バイト28の最終切り込み位置は、最終的
に仕上られるねじ溝14aの断面を微小分割した点群18で
ある。すなわち、点群18は、第３図に示すように、ねじ
溝の最終仕上面14aの断面外縁に沿って微小分割された
多くの点からなる。点群18の各点の位置は、所要の精度
に応じてNC旋盤に予めプログラムされており、バイト28
はこの点群18を求めるように制御されて何回も切り込ま
れる。すなわち、あたかも従来の同時２軸により円弧補
間切削をおこなっているかのように、所望の形状を倣い
切削するのである。The cutting tool 28 cuts the roughened thread groove 14 of the intermediate processed product 11 which is pitch-fed while rotating by the numerical control (NC) many times. The final cutting position of the cutting tool 28 is a point group 18 obtained by finely dividing the cross section of the thread groove 14a to be finally finished. That is, as shown in FIG. 3, the point group 18 is made up of many points minutely divided along the outer edge of the cross section of the final finished surface 14a of the thread groove. The position of each point in the point cloud 18 is pre-programmed in the NC lathe according to the required accuracy and the
Is controlled so as to obtain this point group 18 and is cut many times. That is, the desired shape is profiled and cut, as if the conventional circular interpolation cutting is performed by two simultaneous axes.
このように、ねじ溝の最終仕上形状の各点をバイト28が
切削し、その軌跡の集積がねじ溝の仕上形状となるの
で、高精度のねじ溝加工をおこなうことができる。ま
た、バイト28は僅かな容積を切削するだけであるから切
削抵抗が少なく、欠け及び摩耗が大幅に減少され、しか
も、点群18の点の数を調節することによってその影響を
少なくすることができる。切削抵抗は部分的にわずかに
変化するが、従来の総形バイトによる方法と比べると数
分の１から数10分の１に減少し、びびりの発生が防止さ
れて良好な面粗度が得られる。しかも、バイト28のセッ
ティングにおいて、その誤差の影響はほとんど生じるこ
とがない。In this way, the cutting tool 28 cuts each point of the final finish shape of the thread groove, and the accumulation of the loci becomes the finish shape of the thread groove, so that highly accurate thread groove processing can be performed. Further, since the cutting tool 28 only cuts a small volume, the cutting resistance is small, chipping and wear are greatly reduced, and its influence can be reduced by adjusting the number of points of the point group 18. it can. Cutting resistance changes slightly in part, but it is reduced from a fraction to a few tens of times compared with the conventional method using a general-purpose tool, and chattering is prevented and good surface roughness is obtained. To be Moreover, in the setting of the bite 28, the influence of the error hardly occurs.
発明の効果 本発明は以上の構成であるから、マッハ装置等の装置を
必要とせず、既存のNC旋盤でねじ軸を精度良く切削加工
することができる。EFFECTS OF THE INVENTION Since the present invention has the above-described configuration, it is possible to accurately machine a screw shaft with an existing NC lathe without requiring a device such as a Mach device.
また、バイトが、数値制御により、最終仕上形状ねじ溝
の断面の点群に向かってその軌跡の集積がねじ溝の仕上
形状となるように切り込まれるため、従来では得られな
かった形状精度及び面粗度を得ることができる。また、
バイトの切削容積が小さいことから、切削抵抗が低く、
びびりを防止して、面粗度の良好なねじ軸を得ることが
できるほか、ねじ軸の焼入れ後であっても、ねじ溝の形
状やピッチ等の修正が可能である。Further, since the bite is cut by numerical control toward the point group of the cross section of the final finish shape thread groove so that the accumulation of the locus becomes the finish shape of the thread groove, it is possible to obtain the shape accuracy and the accuracy which were not obtained in the past. Surface roughness can be obtained. Also,
Since the cutting volume of the cutting tool is small, the cutting resistance is low,
It is possible to prevent chattering and obtain a screw shaft with good surface roughness, and it is possible to correct the shape, pitch, etc. of the screw groove even after quenching the screw shaft.
しかも、ねじ溝形状の変更には、数値制御のプログラム
の変更で対応することができる。Moreover, the change of the thread groove shape can be dealt with by changing the numerical control program.
第１図は本発明の原理の概略説明図、第２図はNC旋盤に
第６図の中間加工品を取付けた状態の側面図、第３図は
ねじ溝の点群を示すねじ軸の部分拡大断面図、第４図は
素材を切断した棒材の側面図、第５図はセンタ穴加工を
施した棒材の側面図、第６図は第５図の棒材を荒削りし
た中間加工品の側面図、第７図及び第８図はマッハ装置
の要部概略を示すそれぞれ正面図及び側面断面図であ
る。 11……ねじ軸（中間仕上品） 14……（荒仕上）ねじ溝 14a……仕上ねじ溝 18……点群 20……NC旋盤、28……バイトFIG. 1 is a schematic explanatory view of the principle of the present invention, FIG. 2 is a side view showing a state in which an intermediate processed product of FIG. 6 is attached to an NC lathe, and FIG. 3 is a portion of a screw shaft showing a point group of a screw groove. Enlarged cross-sectional view, Fig. 4 is a side view of the bar material cut from the material, Fig. 5 is a side view of the bar material that has been subjected to center hole machining, and Fig. 6 is an intermediate processed product obtained by roughly cutting the bar material of Fig. 5. FIGS. 7 and 8 are a front view and a side sectional view, respectively, showing the outline of the main part of the Mach device. 11 …… Screw shaft (Intermediate finish) 14 …… (Rough finish) Thread groove 14a …… Finish thread groove 18 …… Point cloud 20 …… NC lathe, 28 …… Bite
Claims (1)
NC旋盤に前記ねじ軸を取付けて回転させてピッチ送り
し、前記ねじ溝の仕上形状の断面外縁を微小分割した点
群を該点群が夫々形成するねじ溝と平行の螺旋経路に沿
って切削するよう、前記点群の位置をあらかじめ記憶し
た前記NC旋盤により数値制御される切削部のねじ軸方向
の巾が前記点群の間隔程度の小巾な尖った形状のバイト
でねじ溝を前記仕上形状に倣い切削させることを特徴と
する、 ボールねじのねじ軸の切削加工方法。1. Roughly cutting the thread groove of the ball screw shaft,
Attach the screw shaft to an NC lathe, rotate and feed by pitch, and cut a point group obtained by minutely dividing the outer peripheral edge of the finish shape of the screw groove along a spiral path parallel to the screw groove formed by each point group. In order to ensure that the position of the point group is stored in advance, the thread groove is finished with a sharp pointed tool whose width in the axial direction of the cutting portion numerically controlled by the NC lathe is about the interval of the point group. A method for cutting a screw shaft of a ball screw, which is characterized by cutting along a shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63329095A JPH0763893B2 (en) | 1988-12-28 | 1988-12-28 | Cutting method of screw shaft for ball screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63329095A JPH0763893B2 (en) | 1988-12-28 | 1988-12-28 | Cutting method of screw shaft for ball screw |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02180523A JPH02180523A (en) | 1990-07-13 |
| JPH0763893B2 true JPH0763893B2 (en) | 1995-07-12 |
Family
ID=18217556
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63329095A Expired - Lifetime JPH0763893B2 (en) | 1988-12-28 | 1988-12-28 | Cutting method of screw shaft for ball screw |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0763893B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5131738B2 (en) * | 2007-05-24 | 2013-01-30 | オークマ株式会社 | Turning method |
| JP5126665B2 (en) * | 2007-12-05 | 2013-01-23 | オークマ株式会社 | Turning method, turning condition and cutting path generation method |
| JP5538754B2 (en) * | 2009-06-15 | 2014-07-02 | Ｎｔｎ株式会社 | Manufacturing method of adjusting wheel for centerless grinding, adjusting wheel, manufacturing method of tapered roller |
| JP2016132092A (en) * | 2015-01-19 | 2016-07-25 | 庸平 中田 | Screw work |
| CN114101812B (en) * | 2021-12-21 | 2022-08-09 | 中国航发中传机械有限公司 | Method for machining multi-head large-groove-width large-helix-angle high-precision internal rectangular threads |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS471627U (en) * | 1971-01-22 | 1972-08-18 | ||
| JPS6299020A (en) * | 1985-10-23 | 1987-05-08 | Okuma Mach Works Ltd | Thread cutting control system |
| JPS63272416A (en) * | 1987-04-28 | 1988-11-09 | Fanuc Ltd | Thread cutting method |
| JPH01228720A (en) * | 1988-03-10 | 1989-09-12 | Fanuc Ltd | Method of machining circular thread |
-
1988
- 1988-12-28 JP JP63329095A patent/JPH0763893B2/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS471627U (en) * | 1971-01-22 | 1972-08-18 | ||
| JPS6299020A (en) * | 1985-10-23 | 1987-05-08 | Okuma Mach Works Ltd | Thread cutting control system |
| JPS63272416A (en) * | 1987-04-28 | 1988-11-09 | Fanuc Ltd | Thread cutting method |
| JPH01228720A (en) * | 1988-03-10 | 1989-09-12 | Fanuc Ltd | Method of machining circular thread |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02180523A (en) | 1990-07-13 |
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