JPS5881535A - Manufacture of rack for rack and pinion steering device - Google Patents
Manufacture of rack for rack and pinion steering deviceInfo
- Publication number
- JPS5881535A JPS5881535A JP17703681A JP17703681A JPS5881535A JP S5881535 A JPS5881535 A JP S5881535A JP 17703681 A JP17703681 A JP 17703681A JP 17703681 A JP17703681 A JP 17703681A JP S5881535 A JPS5881535 A JP S5881535A
- Authority
- JP
- Japan
- Prior art keywords
- rack
- tooth profile
- tooth form
- final
- final tooth
- 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.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/76—Making machine elements elements not mentioned in one of the preceding groups
- B21K1/767—Toothed racks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/76—Making machine elements elements not mentioned in one of the preceding groups
- B21K1/767—Toothed racks
- B21K1/768—Toothed racks hollow
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
Description
【発明の詳細な説明】
この発明はラックアンドビニオンかじ取り装置用ラック
、とくに１７］−変かじ取り比を与えるラックの製造方
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 rack for a rack-and-binion steering system, particularly a rack providing a 17]-variable steering ratio.
従来のこの種のラックの製造方法としては、たとえば特
公昭５６−２ｔ３２１号公報に記４１２されたものがあ
る。この方法は、第１図にボすように、丸棒からなるラ
ック素材ｌの所定位１ａにたとえば機械加工、鍛造加工
などによってラック歯形／ａをプリ成形してこのラック
歯形／ａの断面形状を、第２図に破線で示すように、そ
こに実線でボす最終画形２よりも丈高にするとともに、
その歯元部分の幅が最終歯形２のそれよりも狭くなるよ
うにし、しかる後、ダイスによってラック歯形／ｄを所
要の最終歯形２に令聞加工するものである。As a conventional method for manufacturing this kind of rack, there is one described, for example, in Japanese Patent Publication No. 56-2t321. In this method, as shown in Fig. 1, a rack tooth profile /a is preformed at a predetermined position 1a of a rack material l made of a round bar by machining, forging, etc., and the cross-sectional shape of this rack tooth profile /a is As shown by the broken line in Figure 2, make it taller than the final image 2 marked by a solid line, and
The width of the tooth root portion is made narrower than that of the final tooth profile 2, and then the rack tooth profile /d is processed into the required final tooth profile 2 using a die.
この方法によれば、とくに令聞加工によってラック歯形
／ａの頂部からその歯元へ向けて次第に成形が進行し、
その加工終ｒ時には所要の最終歯形コが得られる。According to this method, the forming progresses gradually from the top of the rack tooth profile /a toward the root of the tooth, especially during machining.
At the end of the machining, the desired final tooth profile is obtained.
しかしながら、このような従来技術にあっては、プリ成
形によって形成されるラック歯形／ａが最終歯形２より
も丈高であるため、
■プリ成形を機械加工にて行う場合には、切削櫨が極め
て多くなる。However, in such conventional technology, since the rack tooth profile /a formed by pre-forming is taller than the final tooth profile 2, ■ When pre-forming is performed by machining, the cutting edge is The number becomes extremely large.
■ブリ成形を鍛造加工にて行う場合には、成形型の凸部
の旨さが高くなってを摩耗し易いとともに、歯形部分を
型内へ完全に入り込筐せ錬い。■If the bulge is formed by forging, the convex part of the mold becomes thicker and tends to wear out easily, and the toothed part is completely inserted into the mold.
などの問題があり、また冷間加工でラック歯形／ａの頂
部全押しつぶすことによって最終歯形２を形成している
ため、
■ダイス内での材料流れが生じ鑓＜、特に最終歯形の１
！１１１１１Ｊに沿って一体な材料流線が生じ離のた礫
終歯形の表面粗度が思い。In addition, the final tooth profile 2 is formed by crushing the entire top of the rack tooth profile /a during cold working.
! 11111J, an integral material streamline is generated and the surface roughness of the separated gravel end tooth shape is considered.
■加えて材料が断面横方向に流動して動力伝達を行う歯
面を形成することから、最終歯形２の！ｉ！ｉｉ度が低
い。■In addition, the material flows in the cross-sectional direction to form the tooth surface that transmits power, so the final tooth profile 2! i! ii degree is low.
などの問題があった。There were other problems.
この発明は従来技術のこのような問題を有利に解決した
ラックの製造方法を提供するものであり、とくに機械加
工または熱ｔＭＩ 、温間もしくは冷間鍛造加工のいず
れかによってラック素４４に最終歯形よりも高さが低く
、かつそれよりもＩ＃ｌ陥が広い歯形をプリ成形してこ
の歯形の体積と最終歯形の体積とを実値的に等しくし、
次いで最終歯形と対応する型を設けたダイスで前記プリ
成杉南形を最終歯形に仕上げ加工することによって、ブ
ックの製造を有利ならしめるとともに、ダイス内での有
効な材料流れに基く最終歯形の表面粗度および強度の向
上をもたらすものである。The present invention provides a method for manufacturing a rack that advantageously solves the problems of the prior art, and in particular, provides a rack blank 44 with a final tooth profile by either machining, hot tMI, warm or cold forging. Pre-forming a tooth profile that is lower in height and has a wider I#l recess than that, making the volume of this tooth profile and the volume of the final tooth profile equal in actual value,
Next, the preformed Sugiminami shape is finished into the final tooth profile using a die equipped with a die that corresponds to the final tooth profile, thereby making it advantageous to manufacture the book and improving the final tooth profile based on the effective material flow within the die. This results in improved surface roughness and strength.
以下にこの発明を図面に基いて説明する。This invention will be explained below based on the drawings.
第３図はこの＠明の成形工程を例１１くする側面図であ
り、第３１図（ａ）は中実丸倖から々るラック素材／ｌ
の所定位置に機械加工、またけ熱間、温間もしくは冷間
鍛造加工のいずれかによって歯ノ１揉部分／３を偏平に
形成した状態をｌドす側面図、第３図（０）は歯形部分
／３に機械加工、または熱間、湿間もしくは冷間＃造加
工のいずれかによって歯形１２をプリ成形した状態を示
す側面図である。Figure 3 is a side view showing the molding process in Example 11, and Figure 31 (a) is a solid round rack material/l.
Figure 3 (0) is a side view showing the state in which tooth 1/3 has been formed into a flat shape by machining, straddle hot, warm or cold forging at a predetermined position. FIG. 7 is a side view showing a state in which a tooth profile 12 is preformed on the tooth profile portion /3 by either machining or hot, wet or cold molding.
従ってプリ成形後のラック素材／ハま歯形部分／３と、
この歯形部分／３に１隣接する円柱状軸部／Ｆ 、 ／
ｊとを有する。Therefore, the rack material after pre-forming / toothed part / 3,
The cylindrical shaft part /F, / which is 1 adjacent to this tooth-shaped part /3
j.
ここで歯形１２は、第を図に拡大断面図で示すように、
そこに破線で示す最終歯形１６よりも高さが低く、かつ
それよりも両幅が広い断面形状を有する。また、歯形１
２の体檀は、引き続く仕上げ加工くは崗杉ｌノの断面積
が最終歯形１６のそれと等しくなるようにしてプレス加
工における歯形／２の流動が〜旬鴬鵞方同うック素材／
／の軸線と直行する方向に生じるのを防止する。Here, the tooth profile 12 is as shown in the enlarged cross-sectional view in Fig.
It has a cross-sectional shape that is lower in height and wider in both widths than the final tooth profile 16 shown by the broken line. Also, tooth profile 1
During the subsequent finishing process, the body of No. 2 is made so that the cross-sectional area of the cedar lance is equal to that of the final tooth profile 16, so that the flow of the tooth profile/2 in the press working is ~Shunho Ryoho Same Uk material/
/ to prevent it from occurring in a direction perpendicular to the axis of /.
次いで、最終歯形／６に正確に対＋ｒ５する型を設けた
ダイスによって、ラック素材／／の歯形／２を第３図ｔ
ｌ））に示すように最終歯形１６に仕上げ加工する。Next, the tooth profile /2 of the rack material // is formed into the tooth profile /2 in Fig. 3 using a die equipped with a die that precisely corresponds to the final tooth profile /6.
Finish machining to the final tooth profile 16 as shown in l)).
この仕上げ加工によって歯形／２は、第を図に破線でボ
すように画幅の狭い丈高の最終歯形／６になる６歯形／
２から最終歯形／６へのかかる成形は、歯形／２の両側
面への押圧力で両頂部分を押し上げるように進行するの
で、ダイス内での材料流動は比較的容易に行なわれ、最
終歯形／６の内部に第Ｓ図に細線で示すように、全体と
してｊｆｕｉ爾形／歯形輪郭に沿う材料流線／７をもた
らすので従来技術によってもたらされるそれよりも最終
歯形／６の表面粗度が向上するとともに、強度が著しく
向上する。さらには動力伝達を行う画面の大１ｆｌ（分
はプリ成形によって成形された部分を押し権めで成形し
ているので両車の強度向上に一層寄与している。Through this finishing process, the tooth profile /2 becomes the final tooth profile /6 with a narrow width and height as shown by the broken line in the figure.6 tooth profile /
The forming process from 2 to the final tooth profile /6 proceeds in such a way that the pressure on both sides of the tooth profile /2 pushes up both apex portions, so material flow within the die is relatively easy, and the final tooth profile As shown by the thin line in Figure S, inside the tooth profile /6, material streamlines /7 that follow the contour of the tooth profile as a whole are created, so the surface roughness of the final tooth profile /6 is higher than that produced by the prior art. At the same time, the strength is significantly improved. Furthermore, the large 1 fl portion of the screen that transmits power is molded using press-fitting on the pre-formed part, which further contributes to improving the strength of both cars.
上述したような最終歯形／６を得るための仕上げ加工は
、たとえば第６図に示すようにプリ成形を終ｒしたラッ
ク素材／ｌを、下金型／８のラック素材／／と対応する
形状の受は都／９内に配置ｉｔ シ、また曲がり防止用
クランプ２０．２／を下降させることによって、ラック
素材ｌ／の円柱状軸部／＋ 、／３を受は部ｌｑ内に確
実に拘束し、次いでダイスとしての上金型ムを所定位ｌ
ｊｔまで押し込み、最終歯形／６と正確に対応するその
型によって、歯形／２を最終歯形／６に成形することに
より行うことができる。In the finishing process to obtain the final tooth profile /6 as described above, for example, as shown in FIG. By lowering the bending prevention clamp 20.2/, the cylindrical shaft parts /+ and /3 of the rack material l/ are securely placed in the receiving part lq. Then, the upper mold as a die is held in a predetermined position.
jt and by shaping the tooth profile /2 into the final tooth profile /6 by means of that mold which exactly corresponds to the final tooth profile /6.
以上述べたように、この発明によれば最終歯形よりも丈
が低く、歯幅の広い歯形をプリ成形し、しかる後仕上げ
加工によって所要の最終歯形を得ることとしたため、プ
リ成形時の切削嵐の減少または型の摩耗防止、加えて表
面粗度ならびに強度のすぐれた最終歯形を得ることがで
きる。As described above, according to the present invention, a tooth profile that is shorter in length and wider than the final tooth profile is pre-formed, and then the desired final tooth profile is obtained through finishing processing, so that the cutting damage during pre-forming is In addition, it is possible to obtain a final tooth profile with excellent surface roughness and strength.
第１図は従来技術のプリ成形歯形を示す斜視図、第２図
は従来技術のプリ成形歯形と最終歯形との関係を示す説
明図、第３図はこの発明の成形工程を例示する側面図、
第ｑ図はこの発明に係るプリ成形歯形と最終歯形との関
係を示す拡大断面図、第５図は最終歯形の材料流線を示
す説明図、第６図は最終歯形の冷間加工状態を示す断面
図である。
／ｌ・・・ラック素材、／２・・・歯形、／３・・・歯
形部分、／ｌ 、 １５・・・円柱状軸部、／６・・・
最終歯形、１７・・・材料流線０Fig. 1 is a perspective view showing a pre-formed tooth profile of the prior art, Fig. 2 is an explanatory diagram showing the relationship between the pre-formed tooth profile of the prior art and the final tooth profile, and Fig. 3 is a side view illustrating the forming process of the present invention. ,
Figure q is an enlarged cross-sectional view showing the relationship between the preformed tooth profile and the final tooth profile according to the present invention, Figure 5 is an explanatory diagram showing the material streamlines of the final tooth profile, and Figure 6 is an illustration of the cold working state of the final tooth profile. FIG. /l...Rack material, /2...Tooth profile, /3...Tooth profile portion, /l, 15...Cylindrical shaft portion, /6...
Final tooth profile, 17...Material streamline 0
Claims (1)
を形成するに際し、ラック素材にまず最終歯形よりも高
さが低く、かつそれよりも歯幅が広い画形をブリ成ルし
てこの画形の体積と最終歯形の体積とを実質的に等しく
し、次いで、最終歯形に対応する型を設けたダイスで前
記プリ成形歯形を最終歯形に仕上げ加工することを特徴
とするラックアンドビニオンかじ取り装置用ラックの製
造方法。 ａ プリ成形を、機械加工、熱間鍛造、濡＋１５＃造ま
たは冷面鍛造のいずｎかによって行うことを特徴とする
′＃肝請求の範囲第１項記載のラックアンドビニオンか
じ取り装置用ラックの製造方法。 ３、 仕上げ加工を熱間鍛造、濡間鍛盾または冷面鍛造
のいずれかによって行うことを特徴とする特許請求の範
囲第１項もしくは第２項記載のラックアンドビニオンか
じ取り装置用ラックの製造方法。[Scope of Claims] 1. When forming a rack for the rack-and-binion steering device W, first a shape is formed on the rack material, which is lower in height than the final tooth profile and wider in tooth width than the final tooth profile. A rack-and-drive device characterized in that the volume of the lever image and the volume of the final tooth profile are made substantially equal, and then the preformed tooth profile is finished into the final tooth profile using a die provided with a mold corresponding to the final tooth profile. A method for manufacturing a rack for a Nion steering device. (a) The rack for a rack-and-binion steering device according to claim 1, wherein the preforming is performed by any one of machining, hot forging, wet +15mm forging, or cold surface forging. manufacturing method. 3. A method for manufacturing a rack for a rack and binion steering device according to claim 1 or 2, wherein the finishing process is performed by hot forging, wet forging, or cold surface forging. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17703681A JPS5881535A (en) | 1981-11-06 | 1981-11-06 | Manufacture of rack for rack and pinion steering device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17703681A JPS5881535A (en) | 1981-11-06 | 1981-11-06 | Manufacture of rack for rack and pinion steering device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5881535A true JPS5881535A (en) | 1983-05-16 |
Family
ID=16024019
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17703681A Pending JPS5881535A (en) | 1981-11-06 | 1981-11-06 | Manufacture of rack for rack and pinion steering device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5881535A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007043625A1 (en) * | 2005-10-12 | 2007-04-19 | Nsk Ltd. | Steering rack and method of manufacturing the same |
| JP2007105751A (en) * | 2005-10-12 | 2007-04-26 | Nsk Ltd | Rack for steering device, and method for manufacturing the same |
| US7225541B2 (en) * | 2003-10-07 | 2007-06-05 | Chiaki Kubota | Method for producing hollow rack bar |
| WO2008053896A1 (en) * | 2006-11-02 | 2008-05-08 | Nsk Ltd. | Rack and production method thereof |
| JP2008138864A (en) * | 2006-11-02 | 2008-06-19 | Nsk Ltd | Rack and its manufacturing method |
| JP2014151833A (en) * | 2013-02-12 | 2014-08-25 | Nsk Ltd | Rack shaft of dual pinion type electric power steering device and method for manufacturing the same |
| JP2015010685A (en) * | 2013-07-01 | 2015-01-19 | 株式会社ジェイテクト | Blank and method of manufacturing rack shaft using blank |
| CN107695281A (en) * | 2016-08-09 | 2018-02-16 | 操纵技术Ip控股公司 | Steering rack and its manufacture method |
| JP2019072769A (en) * | 2017-09-07 | 2019-05-16 | 日本精工株式会社 | Rack and method for manufacture thereof, and steering gear, vehicle and rack preliminary molding die |
-
1981
- 1981-11-06 JP JP17703681A patent/JPS5881535A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7225541B2 (en) * | 2003-10-07 | 2007-06-05 | Chiaki Kubota | Method for producing hollow rack bar |
| WO2007043625A1 (en) * | 2005-10-12 | 2007-04-19 | Nsk Ltd. | Steering rack and method of manufacturing the same |
| JP2007105751A (en) * | 2005-10-12 | 2007-04-26 | Nsk Ltd | Rack for steering device, and method for manufacturing the same |
| US8156781B2 (en) | 2005-10-12 | 2012-04-17 | Nsk Ltd. | Steering rack and method of manufacturing the same |
| WO2008053896A1 (en) * | 2006-11-02 | 2008-05-08 | Nsk Ltd. | Rack and production method thereof |
| JP2008138864A (en) * | 2006-11-02 | 2008-06-19 | Nsk Ltd | Rack and its manufacturing method |
| JP2014151833A (en) * | 2013-02-12 | 2014-08-25 | Nsk Ltd | Rack shaft of dual pinion type electric power steering device and method for manufacturing the same |
| JP2015010685A (en) * | 2013-07-01 | 2015-01-19 | 株式会社ジェイテクト | Blank and method of manufacturing rack shaft using blank |
| CN107695281A (en) * | 2016-08-09 | 2018-02-16 | 操纵技术Ip控股公司 | Steering rack and its manufacture method |
| JP2019072769A (en) * | 2017-09-07 | 2019-05-16 | 日本精工株式会社 | Rack and method for manufacture thereof, and steering gear, vehicle and rack preliminary molding die |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6132030B2 (en) | Manufacturing method of forged crankshaft | |
| US3793703A (en) | Process for fabricating rear axle housing for motor vehicles | |
| US20090301245A1 (en) | Steering rack | |
| JPH035251B2 (en) | ||
| JPS5881535A (en) | Manufacture of rack for rack and pinion steering device | |
| US20050115298A1 (en) | Method and device for producing a steering rack | |
| US3889512A (en) | Steering knuckles and method of forming the same | |
| KR101003252B1 (en) | Die device of closed-die forging for crank throw pin part using insert die | |
| JPH08105513A (en) | High strength gear | |
| GB2026908A (en) | Method of making steering racks | |
| SE416116B (en) | MAKE SUBSTITUTE CHAIN LINKS | |
| JP2016215227A (en) | Manufacturing method of forged crank shaft | |
| JP2016215234A (en) | Manufacturing method of forged crank shaft | |
| CA1042689A (en) | Method for producing cutting teeth for a chain-saw | |
| JPH06182472A (en) | Production method of rack bar | |
| JP4224676B2 (en) | Aluminum alloy forging method | |
| JPH07256377A (en) | Forming method for tooth profile parts made of sheet metal | |
| JPS597455A (en) | Manufacture of rack of variable gear ratio steering device | |
| JPS58221768A (en) | Manufacture of rack for variable gear ratio rack and pinion steering | |
| JPS636301B2 (en) | ||
| KR100197023B1 (en) | Die forging method and mold of large crank thrower for ship engine | |
| JP2870373B2 (en) | Manufacturing method of bevel gear | |
| JP2001259783A (en) | Hot die forging stock for bevel gear, manufacturing device and manufacturing method thereof | |
| CN114160726B (en) | Forging method for forming Z-shaped forging piece | |
| JPH07100210B2 (en) | Method for manufacturing link for linking track |