JPH0413560A - Grinding method for valve switch cam of cam shaft - Google Patents
Grinding method for valve switch cam of cam shaftInfo
- Publication number
- JPH0413560A JPH0413560A JP11786890A JP11786890A JPH0413560A JP H0413560 A JPH0413560 A JP H0413560A JP 11786890 A JP11786890 A JP 11786890A JP 11786890 A JP11786890 A JP 11786890A JP H0413560 A JPH0413560 A JP H0413560A
- Authority
- JP
- Japan
- Prior art keywords
- cam
- grinding
- group
- rough material
- grindstone
- 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
- 238000000034 method Methods 0.000 title claims description 12
- 239000000463 material Substances 0.000 claims abstract description 20
- 238000003754 machining Methods 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 abstract 2
- 238000003672 processing method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Landscapes
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、複数個のバルブ開閉カムを互いに近接かつ並
設して成るカム群を備えたカムシャフトを形成するのに
好適なバルブ開閉カムの研削加工方法に関する。Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a valve opening/closing cam suitable for forming a camshaft having a cam group in which a plurality of valve opening/closing cams are arranged close to each other and in parallel. This invention relates to a grinding method.
［従来の技術］
昨今の４サイクルエンジンには、カムシャフトにカム形
状やカム頂点角度が互いに異なる複数個のバルブ開閉カ
ムを互いに近接かつ並設して成るカム群を設け、上記バ
ルブ開閉カムを選択的に使用することによってエンジン
出力の向上や燃費の低減を図ったものがある。[Prior Art] Modern four-stroke engines are equipped with a cam group on the camshaft in which a plurality of valve opening/closing cams with different cam shapes and cam apex angles are arranged close to each other and in parallel. Some are designed to improve engine output and reduce fuel consumption by selectively using them.
上記の如きカムシャフトを形成するには、周知のカムシ
ャフト研削盤によって、各バルブ開閉カムを一つずつ研
削加工している。To form the camshaft as described above, each valve opening/closing cam is ground one by one using a well-known camshaft grinder.
すなわち、第５図（ａ）、（ｂ）に示すように、まず、
カムシャフトＡに設けられた粗材部Ｂを砥石Ｃ１により
研削して左端のバルブ開閉カムＢ１を形成し、次いで第
５図（Ｃ）に示す如く砥石Ｃ２により中央のバルブ開閉
カムＢ２を形成し、こののち第５図（ｄ）に示すように
砥石Ｃ３によって右端のバルブ開閉カムＢ３を形成して
いる。That is, as shown in FIGS. 5(a) and (b), first,
A rough material part B provided on the camshaft A is ground with a grindstone C1 to form a valve opening/closing cam B1 on the left end, and then a central valve opening/closing cam B2 is formed with a grindstone C2 as shown in FIG. 5(C). Then, as shown in FIG. 5(d), a right-end valve opening/closing cam B3 is formed using a grindstone C3.
［発明が解決しようとする課題］
ところで、各砥石ＣＩ、Ｃ２，Ｃ３により上記粗材部Ｂ
を研削する際、この粗材部８表面の凹凸等を考慮して、
上記各砥石Ｃ１，Ｃ２，−Ｃ３は、粗材部Ｂの表面から
適宜なりリアランスを取った研削送り開始位置（第５図
中ｏ−ｏ線）から研削速度でゆっくりと送られる。[Problems to be Solved by the Invention] By the way, the rough material portion B is
When grinding, take into consideration the unevenness of the surface of the rough material part 8,
Each of the grindstones C1, C2, -C3 is slowly fed at a grinding speed from a grinding feeding start position (o-o line in FIG. 5) which has an appropriate clearance from the surface of the rough material portion B.
このため、上述したカムシャフトの研削加工方法では、
上記送り開始位置からバルブ開閉カムを仕上げ形状とす
るまでの砥石の研削送りを、上記カム群におけるバルブ
開閉カムの個数だけ繰り返し行なわねばならず、一つの
カム群、延いてはカムシャフト全体を形成するのに多大
な加工時間を要していた。Therefore, in the camshaft grinding method described above,
The grinding and feeding of the grindstone from the feed start position to the final shape of the valve opening/closing cam must be repeated for the number of valve opening/closing cams in the cam group, forming one cam group and, by extension, the entire camshaft. It took a lot of processing time to do this.
特に、チルカムのように、粗材から仕上げ形状までの研
削代を多く必要とするものでは、上記加工時間が極めて
長くなる不都合があった。Particularly, in a case such as a chill cam, which requires a large amount of grinding allowance from a rough material to a finished shape, there is a disadvantage that the processing time is extremely long.
本発明は上記実状に鑑みて、加工時間の短縮を可能とし
たカムシャフトのバルブ開閉カム研削加工方法を提供す
ることを目的とする。In view of the above-mentioned circumstances, it is an object of the present invention to provide a method for grinding a camshaft valve opening/closing cam, which makes it possible to shorten processing time.
［課題を解決するための手段］
そこで本発明では、第１の工程で、カム群の形成される
粗材部の周面を、軸方向の全域に亘って最大カムの所定
のカム形状に加工し、こののち上記最大カム以外のカム
を所定のカム形状に加工することによって上記目的を達
成した。[Means for Solving the Problems] Therefore, in the present invention, in the first step, the circumferential surface of the rough material portion where the cam group is formed is machined into a predetermined cam shape with the largest cam over the entire axial direction. However, the above objective was achieved by subsequently processing cams other than the above-mentioned largest cam into a predetermined cam shape.
［作用コ
上記加工方法によれば、第１の工程を経ることにより粗
材部の全体が−回り小さくなるので、上記第１の工程の
後の工程では砥石の研削送り開始位置を粗材部の中心に
近付けることができる。[Operation] According to the above-mentioned processing method, the entire rough material part becomes smaller by - around the corner through the first step. can be brought closer to the center of
［実施例コ
以下、一実施例を示す図面に基づいて本発明の詳細な説
明する。[Example 1] Hereinafter, the present invention will be described in detail based on the drawings showing one example.
第２図ないし第４図は、本発明に関わるバルブ開閉カム
の研削加工方法によって形成された４サイクルエンジン
のカムシャフト１を示している。2 to 4 show a camshaft 1 for a four-stroke engine formed by the method of grinding a valve opening/closing cam according to the present invention.
上記カムシャフト１は、第１のカム群１ｏと第２のカム
群２０とを備えており、上記第１のカム群１０は、互い
に近接して並設された右方カム１１、中央カム１２、お
よび左方カム１３を有している。The camshaft 1 includes a first cam group 1o and a second cam group 20, and the first cam group 10 includes a right cam 11 and a center cam 12, which are arranged close to each other in parallel. , and a left cam 13.
上記各カム１１，１２．１３は、第３．４図に示すよう
に、カム頂点角度を互いに異ならせて形成されており、
さらに第４図に明示するように上記中央カム１２は、そ
のカム面が全周に亘って他の右方カム１１および左方カ
ム１３のカム面よりも径外域に位置するように形成され
ている。すなわち上記中央カム１２は、カム群１ｏにお
ける最大カムを構成している。The cams 11, 12, 13 are formed with different cam apex angles, as shown in Fig. 3.4.
Further, as clearly shown in FIG. 4, the central cam 12 is formed such that its cam surface is located in a radially outer area than the cam surfaces of the other right cam 11 and left cam 13 over the entire circumference. There is. That is, the central cam 12 constitutes the largest cam in the cam group 1o.
一方、上記第２のカム群２０も、互いに近接して並設さ
れた右方カム２１、中央カム２２、および左方カム２３
を有しており、これら各カム２１゜２２．２３は、カム
頂点角度を互いに異ならせて形成されているとともに、
中央カム２２がカム群２０における最大カムを構成して
いる。On the other hand, the second cam group 20 also includes a right cam 21, a center cam 22, and a left cam 23 arranged close to each other in parallel.
The cams 21, 22, and 23 are formed with different cam apex angles, and
The central cam 22 constitutes the largest cam in the cam group 20.
なお、上記カムシャフト１には、上記第１および第２の
カム群とともに、これらカム群と同態様の第３および第
４のカム群（図示せず）が設けられており、これら第１
から第４のカム群は互いに９０度の中心角をもって径外
方向に突出している。In addition, the camshaft 1 is provided with third and fourth cam groups (not shown) having the same configuration as these cam groups, together with the first and second cam groups.
The fourth cam group protrudes radially outward at a center angle of 90 degrees with respect to each other.
以下に、上記カムシャフト１における第１のカム群１０
の研削加工方法を説明する。なお、第２のカム群および
第３．第４のカム群は、１記第１のカム群１０と全く同
様の加工方法によって形成されるので説明を省略する。Below, the first cam group 10 in the camshaft 1 will be described.
The grinding method will be explained. Note that the second cam group and the third cam group. The fourth cam group is formed by the same processing method as the first cam group 10 described above, so the explanation thereof will be omitted.
第１図（ａ）中に実線、第４図中に鎖線で示すように、
カム群１ｏが形成される以前のカムシャフト１には、上
記カム群１ｏの形成される部位に該カム群１０を包含す
る大きさの粗材部１００が′設けられている。As shown by the solid line in Figure 1(a) and the chain line in Figure 4,
Before the cam group 1o is formed, the camshaft 1 is provided with a rough material portion 100 having a size that includes the cam group 10 at a portion where the cam group 1o is formed.
また、クランクシャフト研削盤は、第１図に示すように
、第１の砥石５１、第２の砥石５２、および第３の砥石
５３を備えており、上記第１の砥石５１は上記粗材部１
００の軸方向の全幅よりも幅広に形成されているととも
に、上記第２の砥石５２および第３の砥石５３は、それ
ぞれ右方カム１１および左方カム１３の幅に対応して形
成されている。Further, as shown in FIG. 1, the crankshaft grinder includes a first grindstone 51, a second grindstone 52, and a third grindstone 53, and the first grindstone 51 is used for the rough material part. 1
The second grindstone 52 and the third grindstone 53 are formed to correspond to the widths of the right cam 11 and the left cam 13, respectively. .
第１の工程では、上記第１の砥石５１が第１図（ａ）中
の０−０線で示すアプローチポイント、すなわち砥石の
研削送り開始位置まで早送りされ、次いで第１図（ｂ）
中に鎖線で示す上記研削送り開始位置から実線で示す研
削仕上げ位置まで緩やかに研削送りされる。In the first step, the first grindstone 51 is rapidly traversed to the approach point indicated by the 0-0 line in FIG. 1(a), that is, the grinding feed start position of the grindstone, and then as shown in FIG. 1(b).
The grinding feed is carried out slowly from the grinding feed start position indicated by the chain line inside to the grinding finishing position indicated by the solid line.
この結果、上記粗材部１００は、第１図（ｂ）に示す如
く、その全幅に亘って最大カムたる中央カム１２の所定
のカム形状（カムプロフィール）に研削加工される。As a result, the rough material portion 100 is ground over its entire width into a predetermined cam shape (cam profile) of the central cam 12, which is the largest cam, as shown in FIG. 1(b).
上記第１の工程が終了したのちの次なる工程では、第２
の砥石５２が第１図（ｃ）中の鎖線で示す研削送り開始
位置から、実線で示す研削仕上げ位置まで緩やかに研削
送りされ、もって左方カム１１が形成される。In the next step after the first step is completed, the second
The grindstone 52 is gradually fed from the grinding feed start position shown by the chain line in FIG. 1(c) to the grinding finishing position shown by the solid line, thereby forming the left cam 11.
ここで、第１図（ｂ）に示す上記第１の工程を紅た粗材
部１００は、第１図（ａ）に示した第１の工程以前の粗
材部１００に比べて−回り小さくなっている。このため
、粗材部１００の周面から所定の間隔をもって設定され
る第１図（ｃ）中のｏ −０′線で示す研削送り開始位
置は、０−０線で示す第１の工程時における砥石の研削
送り開始位置よりも、粗材部１００の中心に近付けて設
定されている。Here, the raw material part 100 shown in FIG. 1(b) which has undergone the first step is smaller in circumference than the raw material part 100 which has undergone the first step shown in FIG. 1(a). It has become. Therefore, the grinding feed start position indicated by the o-0' line in FIG. The grinding feed start position of the grindstone is set closer to the center of the rough material portion 100 than the grinding feed start position of the grindstone.
この結果、研削仕上げ位置までの砥石５２の送り量が短
くて済み、もって加工時間の短縮が達成される。また、
上記左方カム１１を形成する際の研削代は、第１図（Ｃ
）にＧｌて示す如く極めて少ない。As a result, the amount of feed of the grindstone 52 to the finishing position of grinding can be shortened, thereby achieving a reduction in machining time. Also,
The grinding allowance when forming the left cam 11 is shown in Figure 1 (C
) is extremely small as shown by Gl.
上記左方カム１１を形成したのち、第３の砥石５３が第
１図（ｄ）中の鎖線で示す研削送り開始位置から、実線
で示す研削仕上げ位置まで緩やかに研削送りされ、もっ
て右方カム１３が形成される。After forming the left cam 11, the third grinding wheel 53 is gently fed from the grinding feed start position shown by the chain line in FIG. 1(d) to the grinding finish position shown by the solid line, and the right cam 13 is formed.
この工程においても、上記左方カム１１を形成する際と
同様の理由により、第１図（ｄ）に００′線で示した研
削送り開始位置から砥石５３が研削送りされるため加工
時間が短くて済み、かつ研削代も第１図（ｄ）にＧｒて
示す如く極めて少なくて済む。In this step as well, for the same reason as when forming the left cam 11, the grinding wheel 53 is fed from the grinding feed start position indicated by the 00' line in FIG. 1(d), so the machining time is short. Moreover, the grinding allowance can be extremely small as shown by Gr in FIG. 1(d).
上記右方カム１３を形成したのち、左方カム１１と中央
カム１２との間および中央カム１２と右方カム１３との
間の溝を形成して、カム群１０が完成する。After forming the right cam 13, grooves are formed between the left cam 11 and the center cam 12 and between the center cam 12 and the right cam 13, thereby completing the cam group 10.
なお、左方カム１１と右方カム１３とは、どちらを先に
加工しても良く、また同時期に加工を行なうことも可能
である。Note that either the left cam 11 or the right cam 13 may be machined first, or they may be machined at the same time.
また、左方カムと右方カムとが互いに同一のカム形状お
よびカム頂点角度を有するとともに、そのカム面が全周
に亘って中央カムのカム面よりも径外域に位置するよう
構成されたカム群を研削加工する場合には、第１の工程
で上記左方カムと右方カムとを幅広の砥石で同時に研削
して仕上げたのち、中央カムを研削すればよい。Further, the left cam and the right cam have the same cam shape and the same cam apex angle, and the cam surface is located in a radially outer region than the cam surface of the central cam over the entire circumference. In the case of grinding the group, the left cam and the right cam may be ground at the same time using a wide grindstone in the first step, and then the center cam may be ground.
すなわち、この場合では、３つのカムから成るカム群を
２工程で加工することができ、更なる加工時間の短縮が
達成される。That is, in this case, the cam group consisting of three cams can be machined in two steps, further shortening the machining time.
さらに、本発明に関わる加工方法は、上述した実施例に
限定されるものではなく、様々な態様のカム群を研削加
工するのに有効に適用し得ることは勿論である。Further, the processing method according to the present invention is not limited to the above-described embodiments, and can of course be effectively applied to grinding various types of cam groups.
［発明の効果］
以上、詳述した如く、本発明に関わるカムシャフトのバ
ルブ開閉カム研削加工方法によれば、第１の工程で、カ
ム群の形成される粗材部の周面を軸方向の全域に亘って
最大カムの所定のカム形状に加工しているので、第１の
工程を経ることにより粗材部の全体が−回り小さくなり
、上記第１の工程の後に上記最大カム以外のカムを所定
のカム形状に加工する工程において、砥石の研削送り開
始位置を粗材部の中心に近付けることができる。[Effects of the Invention] As described above in detail, according to the camshaft valve opening/closing cam grinding method according to the present invention, in the first step, the circumferential surface of the rough material portion where the cam group is formed is axially Since the entire area of the cam is machined into the predetermined cam shape of the largest cam, the entire rough material part becomes smaller by the first step, and after the first step, the cam other than the largest cam is In the process of machining the cam into a predetermined cam shape, the grinding feed start position of the grindstone can be moved closer to the center of the rough material portion.
これにより、一つのカム群を研削加工する際の砥石の研
削送りに費やされる時間か短くて済み、この結果、カム
シャフトのバルブ開閉カムを形成する際の加工時間を従
来の加工方法に比べて大幅に短縮することか可能となっ
た。As a result, the time spent on grinding and feeding the grinding wheel when grinding one cam group is reduced, and as a result, the processing time when forming the valve opening/closing cam of the camshaft is reduced compared to conventional processing methods. It became possible to shorten the time considerably.
第１図（ａ）ないしくｄ）は本発明に関わる加工方法を
工程順に示す概念図、
第２図および第３図は本発明に関わる加工方法によって
作成されるカムシャフトの部分側面図および端面図、
第４図は第２図のＩＶ−ＩＶ線断面図、第５図は従来の
加工方法を工程順に示す概念図。
１〜・・カムシャフト、
１０・・・第１のカム群、
２０・・・第２のカム群、
１１．２１・・・右方カム、
１２．２２・・・中央カム
１３．２３・・・左方カム、
１００．１００ｂ・・・粗材部、
５１・・・第１の砥石、
５２・・・第２の砥石、
５３・・・第３の砥石。
（最大カム）
第２図
第４図
（Ｃ）
（ｂ）
（ｄ）
手続補正書
６゜
補正の内容
１゜
２゜
事件の表示
平成２年特許願第１１７８６８号
発明の名称
カムシャフトのバルブ開閉カム研削加工方法（１） 明
細書、第２頁第１３行の「カムシャフト研削盤」を「カ
ム研削盤」と補正する。
（２） 同、第２頁第１３行の「設けられている。」を
「設けられており、上記粗材部１００の周面には、各カ
ム１１．１２．１３を互いに区画し、かつ研削逃げとし
て作用する溝が形成されている。」と補正する。
４゜
５゜Figures 1 (a) to d) are conceptual diagrams showing the processing method according to the present invention in the order of steps; Figures 2 and 3 are partial side views and end faces of a camshaft produced by the processing method according to the present invention; FIG. 4 is a sectional view taken along the line IV--IV in FIG. 2, and FIG. 5 is a conceptual diagram showing the conventional processing method in the order of steps. 1~...Camshaft, 10...First cam group, 20...Second cam group, 11.21...Right cam, 12.22...Central cam 13.23... -Left cam, 100.100b... Rough material part, 51... First whetstone, 52... Second whetstone, 53... Third whetstone. (Maximum cam) Figure 2 Figure 4 (C) (b) (d) Procedural amendment 6゜Contents of amendment 1゜2゜Indication of incident 1990 patent application No. 117868 Name of invention Camshaft valve opening/closing Cam grinding method (1) "Camshaft grinder" on page 2, line 13 of the specification is corrected to "cam grinder." (2) In the same document, page 2, line 13, "provided." A groove is formed that acts as a grinding relief.'' 4゜5゜
Claims (1)
カム群を備えたカムシャフトのバルブ開閉カム研削加工
方法において、 上記カム群の形成される粗材の周面全域を、カム面が全
周に亘って他のバルブ開閉カムのカム面よりも径外域に
位置する最大カムの所定のカム形状に加工する第１の工
程と、 上記第１の工程の後、上記最大カム以外のカムを所定の
カム形状に加工する工程と、 を含むことを特徴とするカムシャフトのバルブ開閉カム
研削加工方法。[Claims] In a method for grinding a valve opening/closing cam of a camshaft having a cam group in which a plurality of valve opening/closing cams are arranged adjacent to each other and in parallel, the entire circumferential surface of a rough material on which the cam group is formed. A first step of machining the cam surface into a predetermined cam shape of the largest cam located in a radially outer area than the cam surfaces of other valve opening/closing cams over the entire circumference; After the first step, the above-mentioned A method for grinding a valve opening/closing cam of a camshaft, the method comprising: processing a cam other than the largest cam into a predetermined cam shape;
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11786890A JPH0413560A (en) | 1990-05-08 | 1990-05-08 | Grinding method for valve switch cam of cam shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11786890A JPH0413560A (en) | 1990-05-08 | 1990-05-08 | Grinding method for valve switch cam of cam shaft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0413560A true JPH0413560A (en) | 1992-01-17 |
Family
ID=14722276
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11786890A Pending JPH0413560A (en) | 1990-05-08 | 1990-05-08 | Grinding method for valve switch cam of cam shaft |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0413560A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10333916A1 (en) * | 2003-07-25 | 2005-03-03 | Audi Ag | Method for grinding cams of internal combustion engine cam shafts involves machining root circle in one work step to ideal size through grinding disc |
| JP2017078368A (en) * | 2015-10-21 | 2017-04-27 | トヨタ自動車株式会社 | Manufacturing method of cam unit |
| DE102016122148A1 (en) | 2015-11-20 | 2017-05-24 | Jtekt Corporation | Cam grinding machine and cam grinding method |
| DE102016123126A1 (en) | 2015-12-02 | 2017-06-08 | Jtekt Corporation | Cam grinding device and cam grinding method |
| DE102017105942A1 (en) | 2016-03-23 | 2017-09-28 | Jtekt Corporation | Cam grinding machine and cam grinding method |
-
1990
- 1990-05-08 JP JP11786890A patent/JPH0413560A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10333916A1 (en) * | 2003-07-25 | 2005-03-03 | Audi Ag | Method for grinding cams of internal combustion engine cam shafts involves machining root circle in one work step to ideal size through grinding disc |
| DE10333916B4 (en) * | 2003-07-25 | 2010-10-14 | Audi Ag | Method for grinding the cams of internal combustion engine camshafts |
| JP2017078368A (en) * | 2015-10-21 | 2017-04-27 | トヨタ自動車株式会社 | Manufacturing method of cam unit |
| DE102016122148A1 (en) | 2015-11-20 | 2017-05-24 | Jtekt Corporation | Cam grinding machine and cam grinding method |
| US10322489B2 (en) | 2015-11-20 | 2019-06-18 | Jtekt Corporation | Cam grinding machine and cam grinding method |
| DE102016123126A1 (en) | 2015-12-02 | 2017-06-08 | Jtekt Corporation | Cam grinding device and cam grinding method |
| US10071457B2 (en) | 2015-12-02 | 2018-09-11 | Jtekt Corporation | Cam grinding device and cam grinding method |
| DE102017105942A1 (en) | 2016-03-23 | 2017-09-28 | Jtekt Corporation | Cam grinding machine and cam grinding method |
| US10343251B2 (en) | 2016-03-23 | 2019-07-09 | Jtekt Corporation | Cam grinding machine and cam grinding method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9358605B2 (en) | Method and production line for machining a crankshaft | |
| RU2043906C1 (en) | Method of grinding the outer surface of cylindrical blanks and device for its realization | |
| JPH0413560A (en) | Grinding method for valve switch cam of cam shaft | |
| JPH06249317A (en) | Thread groove forming method for ball screw | |
| ATE188536T1 (en) | MANUFACTURING METHOD FOR A SEPARATELY MANUFACTURED CONTROL CAM, IN PARTICULAR A BUILT-IN CAMSHAFT FOR INTERNATIONAL INTERNAL ENGINE MACHINES | |
| EP0844046A2 (en) | A process for machining an edge portion of a ceramic article preform without chipping | |
| JPH02294504A (en) | Cam shaft | |
| JPS5927315B2 (en) | Crankshaft processing method | |
| JPS60172453A (en) | Working for engine-valve shaft edge | |
| US4703544A (en) | Method of manufacturing a rotor for hydraulic rotary valve | |
| JP2017154242A (en) | Designing method for cam profile | |
| JP2767323B2 (en) | Method and apparatus for manufacturing camshaft | |
| SU389889A1 (en) | METHOD OF MAKING SHEETS | |
| JPS59110545A (en) | Machining method of valve for engine | |
| LU502682B1 (en) | Method for grinding crankshaft journal symmetrically | |
| JPH03149139A (en) | Work method for crankshaft | |
| CN111390206B (en) | Numerical control blade blank and method for quickly aligning inscribed circle thereof | |
| JP2706987B2 (en) | Ceramic member having cylindrical portion and method of grinding the cylindrical portion | |
| JPS63150165A (en) | Gear-type grindstone | |
| KR20030037087A (en) | Manufacturing method for base ring of ship engine | |
| JPS58137550A (en) | Method of grinding stepped shaft | |
| RU1812080C (en) | Deforming-cutting broach | |
| JPH07171744A (en) | Method for crowning of roller-shaped rolling member | |
| JPH06173757A (en) | Method of manufacturing piston ring for internal combustion engine | |
| JPH05306719A (en) | Rolling element |