JPH021614B2 - - Google Patents
Info
- Publication number
- JPH021614B2 JPH021614B2 JP17003983A JP17003983A JPH021614B2 JP H021614 B2 JPH021614 B2 JP H021614B2 JP 17003983 A JP17003983 A JP 17003983A JP 17003983 A JP17003983 A JP 17003983A JP H021614 B2 JPH021614 B2 JP H021614B2
- Authority
- JP
- Japan
- Prior art keywords
- female thread
- diameter
- tap
- effective diameter
- valley
- 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
- 238000000034 method Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 5
- 238000003754 machining Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000003672 processing method Methods 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009760 electrical discharge machining Methods 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H3/00—Making helical bodies or bodies having parts of helical shape
- B21H3/10—Making helical bodies or bodies having parts of helical shape twist-drills; screw-taps
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Description
【発明の詳細な説明】
この発明は、めねじの有効径縮小方法に関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for reducing the effective diameter of a female thread.
一般に、めねじの加工方法としては、タツプや
バイト等による切削加工、盛上げタツプによる塑
性加工、砥石による研削加工や、放電加工等があ
る。 In general, methods for processing female threads include cutting using a tap or tool, plastic processing using a raised tap, grinding using a grindstone, electrical discharge machining, and the like.
めねじの加工において、例えばタツプによる切
削加工の場合は、被削材質によつてはスプリング
バツクにより有効径が縮小したり、構成刃先の成
生により有効径が拡大したりする加工誤差を生じ
る。 In machining a female thread, for example, when cutting with a tap, machining errors may occur, such as a reduction in the effective diameter due to spring back or an enlargement of the effective diameter due to the formation of a built-up cutting edge, depending on the material of the workpiece.
他の加工方法においても、加工誤差を生じて、
めねじ有効径の過小又は過大が起こる。 Other machining methods also produce machining errors,
The effective diameter of the female thread may become too small or too large.
有効径が過小なものは、従来の加工方法によつ
て修正加工することにより所定の寸法に入れるこ
とが可能であるが、過大のものは、メツキが許さ
れるもの以外は救済することができず、不合格品
となる。 If the effective diameter is too small, it is possible to make it to the specified dimensions by modifying it using conventional processing methods, but if it is too large, it cannot be salvaged unless it is allowed to be plated. , the product will be rejected.
本発明は、前記のめねじ有効径の過大による不
合格品を再タツピングにより救済することを目的
としている。 The object of the present invention is to rescue rejected products due to an excessively large effective diameter of the female thread by retapping.
第１図は本発明のめねじ有効径縮小方法を説明
する図面で、めねじの山を拡大図示している。 FIG. 1 is a drawing for explaining the method for reducing the effective diameter of a female thread according to the present invention, and shows an enlarged view of the threads of the female thread.
実線は修正加工前のねじ山で、１は谷、２は内
径D1を形成する面、３はフランク（側面）、Ｄは
谷の径、D2は有効径である。 The solid line is the thread before modification, 1 is the valley, 2 is the surface forming the inner diameter D1 , 3 is the flank (side surface), D is the diameter of the valley, and D2 is the effective diameter.
後述する本発明のめねじ有効径縮小用盛上げタ
ツプを用いて、面２で形成されている内径を
D1′まで拡大すると、面２が２′の位置迄後退しハ
ツチングしたａ，a′部の材料がめねじの外周方向
に向つて移動するよう塑性変形し、同時にフラン
ク３が３′の位置迄出つ張るように、ハツチング
したｂ，b′部が塑性変形で形成される。 Using the female thread effective diameter reducing tap of the present invention, which will be described later, the inner diameter formed by surface 2 is
When expanded to D 1 ', surface 2 retreats to position 2', the material at hatched parts a and a' is plastically deformed to move toward the outer circumference of the female thread, and at the same time, flank 3 moves to position 3'. Hatched portions b and b' are formed by plastic deformation so as to protrude.
第１図では、内径D1を拡大することで、フラ
ンク３を押し出す場合を示しているが、内径D1
と谷の径Ｄを同時に拡大してフランク３を押し出
すように塑性変形させることもできる。 In Fig. 1, the case where the flank 3 is pushed out by enlarging the inner diameter D 1 is shown, but the inner diameter D 1
It is also possible to plastically deform the flank 3 by expanding the diameter D of the valley and pushing out the flank 3 at the same time.
このように、修正加工で、塑性変形させて、フ
ランク３を３′の位置迄押し出すと、有効径当量
δD2だけ有効径を縮小させ、有効径D2をD2′に修
正でき、めねじ山形状は第１図の破線のようにな
る。 In this way, by plastically deforming the flank 3 and pushing it out to the position 3' during correction machining, the effective diameter can be reduced by the effective diameter equivalent δD 2 and the effective diameter D 2 can be corrected to D 2 '. The shape of the mountain looks like the broken line in Figure 1.
前述のように、修正前内径D1を修正後内径
D1′に塑性変形するのであり、当然、完全山側の
タツプ谷の径d1-cは修正後めねじ内径：D1′に等
しくする。 As mentioned above, the inner diameter before correction D 1 is the inner diameter after correction
It is plastically deformed to D 1 ′, and naturally the diameter d 1-c of the tap valley on the complete peak side is made equal to the inner diameter of the internal thread after correction: D 1 ′.
しかるに、食付き端では、めねじ内径が修正前
内径：D1でありD1＜D1′であることから、タツプ
谷の径もまたd1-cよりも細くなければ食付いてゆ
かない。 However, at the chamfered end, the inner diameter of the female thread is the inner diameter before correction: D 1 , and D 1 < D 1 ', so the diameter of the tap valley must also be smaller than d 1-c for it to bite. .
すなわち、タツプ食付き端におけるタツプ谷の
径：d1-aは、前記内径D1より小さくする。 That is, the diameter of the tap valley at the tap chamfered end: d 1-a is made smaller than the inner diameter D 1 .
こうして、タツプ谷の径は、d1-a＜d1-b＜d1-c
の関係になり、図示のようにタツプ食付き山の
左、右谷の径差がＣ、山の左右谷の径差がｅの
ように完全山に向つて漸増する谷の径をもつたタ
ツプとする。 Thus, the diameter of the tap valley is d 1-a < d 1-b < d 1-c
As shown in the figure, the difference in diameter between the left and right valleys of the tap-biting peak is C, and the diameter difference between the left and right valleys of the peak is e, so that the tap has a valley diameter that gradually increases toward the complete peak. shall be.
有効径は、逆に漸減させることが望ましいが、
これを省略しても良い。 On the contrary, it is desirable to gradually reduce the effective diameter.
This may be omitted.
又、めねじ谷の径をも塑性変形させる場合は、
タツプ外径を内径と同様に漸増させる。 Also, when plastically deforming the diameter of the female thread root,
Gradually increase the outside diameter of the tap in the same way as the inside diameter.
なお、上述の例では、めねじの谷及び内径の断
面形状が第３図のように直線であるが、これの双
方、又は一方を第４図に示すように丸みを付ける
こともできる。 In the above-mentioned example, the cross-sectional shapes of the root and inner diameter of the female thread are straight lines as shown in FIG. 3, but both or one of them may be rounded as shown in FIG. 4.
また、製品の許すところに従つて、めねじの谷
を第５図、盛上げタツプの谷底を第６図に示す形
状にすることより、有効径の修正量を大きくする
こともできる。 Further, depending on the product, the amount of correction of the effective diameter can be increased by making the trough of the female thread into the shape shown in FIG. 5 and the bottom of the raised tap into the shape shown in FIG. 6.
被削材質SS41にM8×1.25のねじタツピングを
行い、めねじ有効径が拡大した製品に対し、本発
明によるめねじ有効径縮小方法を用いた例を第７
図、第８図に示す。 The seventh example shows an example in which the method for reducing the effective diameter of a female thread according to the present invention was applied to a product in which the effective diameter of the female thread was expanded by tapping a M8 x 1.25 thread on the workpiece material SS41.
As shown in FIG.
第７図は、タツピングにより拡大しためねじの
断面写真であり、第８図は、本発明により縮小し
ためねじの断面写真を示す。 FIG. 7 is a cross-sectional photograph of an internal thread enlarged by tapping, and FIG. 8 is a cross-sectional photograph of an internal thread reduced by the present invention.
この例では、拡大しためねじの内径山頂及び谷
の径谷底の双方を塑性変形し、有効径を縮小せし
めたもので、その縮小量として0.040mmを得た。 In this example, both the inner diameter peak and the valley bottom of the enlarged internal thread were plastically deformed to reduce the effective diameter, and the amount of reduction was 0.040 mm.
従来救済方法がないため廃棄処分されていため
ねじ有効径の拡大による不合格品は、素材に塑性
変形能があり、かつ内径、谷の径に余肉があれば
本発明の方法によつて救済することができ、その
経済的効果は莫大である。又、フランク面を滑ら
かにする効果もある。 Rejected products due to enlargement of the effective diameter of internal threads, which were previously discarded because there was no salvage method, can be salvaged by the method of the present invention if the material has plastic deformability and there is excess thickness on the inner diameter and valley diameter. The economic effects are enormous. It also has the effect of smoothing the flank surface.
第１図は、めねじ有効径の縮小加工作用を説明
する図である。第２図は、本発明の加工方法を実
施するための、めねじ有効径縮小用盛上げタツプ
の食付き部山形の一例を示したものである。第３
図と第４図は、めねじの谷及び内径の形状の例、
第５図は、めねじの谷の他の形状例、第６図は、
タツプの谷底の形状例を示す。第７図は、拡大し
ためねじの断面写真を示し、第８図は第７図のめ
ねじに対して本発明を適用した実施例の断面写真
を示す。
１……谷、２，２′……内径を形成する面、３，
３′……フランク（側面）、Ｄ，D′……谷の径、
D1，D1′……内径、D2，D2′……有効径、Ｐ……
ピツチ、α……ねじ山の半角。
FIG. 1 is a diagram illustrating the effect of reducing the effective diameter of the female thread. FIG. 2 shows an example of the chevron shape of the chamfered portion of a build-up tap for reducing the effective diameter of a female thread for carrying out the processing method of the present invention. Third
The figure and Fig. 4 are examples of the shape of the valley and inner diameter of the female thread,
Figure 5 shows another example of the shape of the valley of the female thread, and Figure 6 shows
An example of the shape of the bottom of a tap is shown. FIG. 7 shows an enlarged cross-sectional photograph of the internal thread, and FIG. 8 shows a cross-sectional photograph of an example in which the present invention is applied to the internal thread of FIG. 1... Valley, 2, 2'... Surface forming the inner diameter, 3,
3'...Frank (side), D, D'...Diameter of the valley,
D 1 , D 1 ′...Inner diameter, D 2 , D 2 ′...Effective diameter, P...
Pitch, α...half-width of the screw thread.
Claims (1)
の一方又はは両方をめねじ有効径縮小用盛上げタ
ツプを用いて塑性変形により拡大させることによ
りめねじ山頂および谷部から押出されためねじの
材料をめねじのフランク部へ流動させ、タツプの
ねじ山フランクとの間に設けられた間〓にめねじ
のフランク部を盛り上げることによつて、有効径
を縮小させ、所定のめねじ精度に合致させること
を特徴とするめねじ有効径縮小方法。1. By plastically deforming one or both of the inner diameter and the root diameter of the pre-formed female thread using a fill-up tap for reducing the effective diameter of the female thread, the material of the female thread extruded from the top and valley of the female thread is expanded. The effective diameter is reduced by flowing to the flank part of the female thread and raising the flank part of the female thread in the space provided between the thread flank of the tap and the specified female thread accuracy. A method for reducing the effective diameter of a female thread, characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17003983A JPS6062414A (en) | 1983-09-14 | 1983-09-14 | Method of reducing effective diameter of female screw, and rolled thread tap for said reduction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17003983A JPS6062414A (en) | 1983-09-14 | 1983-09-14 | Method of reducing effective diameter of female screw, and rolled thread tap for said reduction |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6062414A JPS6062414A (en) | 1985-04-10 |
| JPH021614B2 true JPH021614B2 (en) | 1990-01-12 |
Family
ID=15897474
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17003983A Granted JPS6062414A (en) | 1983-09-14 | 1983-09-14 | Method of reducing effective diameter of female screw, and rolled thread tap for said reduction |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6062414A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0491816U (en) * | 1990-12-25 | 1992-08-11 |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EA000161B1 (en) * | 1995-07-21 | 1998-10-29 | Майкл А. Гарвер | Anti-cross threading fastener |
| JP4580061B2 (en) * | 2000-05-09 | 2010-11-10 | ヤンマー株式会社 | Rolled female screw |
-
1983
- 1983-09-14 JP JP17003983A patent/JPS6062414A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0491816U (en) * | 1990-12-25 | 1992-08-11 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6062414A (en) | 1985-04-10 |
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