JPH0515766B2 - - Google Patents
Info
- Publication number
- JPH0515766B2 JPH0515766B2 JP63013348A JP1334888A JPH0515766B2 JP H0515766 B2 JPH0515766 B2 JP H0515766B2 JP 63013348 A JP63013348 A JP 63013348A JP 1334888 A JP1334888 A JP 1334888A JP H0515766 B2 JPH0515766 B2 JP H0515766B2
- Authority
- JP
- Japan
- Prior art keywords
- crankshaft
- dead center
- coil
- pin
- point
- 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
- 230000006698 induction Effects 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- Heat Treatment Of Articles (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明はクランクシヤフトのピン部の高周波表
面焼入法に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an induction hardening method for the pin portion of a crankshaft.
従来の技術
従来、クランクシヤフトを中心軸のまわりに回
転させながらピン部に通電された高周波表面焼入
コイルを載置してピン部を高周波表面焼入する場
合には、ピン部に形成された硬化層の幅を均一に
するために、高周波表面焼入コイルへの通電は、
ピン部の上死点の手前の所定の位置と上死点との
間の区間、および上死点と上死点の後の所定の区
間は、前記両区間以外の区間よりも高周波表面焼
入コイルに印加する電力を少なくする方法が採用
されている（特願昭62−333084）。Conventional technology Conventionally, when the crankshaft is rotated around the central axis and an energized high-frequency surface hardening coil is placed on the pin portion to perform induction surface hardening on the pin portion, a In order to make the width of the hardened layer uniform, the high frequency surface hardening coil is energized by
The section between the predetermined position before the top dead center of the pin part and the top dead center, and the predetermined section between the top dead center and the predetermined section after the top dead center are subjected to high frequency surface hardening more than the sections other than the above two sections. A method has been adopted to reduce the power applied to the coil (Japanese Patent Application No. 62-333084).
そして、このような焼入を行う場合、高周波表
面焼入コイルへの高周波電流の通電は、予め実験
等によつて定められた所定の時間行われる。 When such hardening is performed, high-frequency current is applied to the high-frequency surface hardening coil for a predetermined period of time determined in advance through experiments or the like.
発明が解決しようとする課題
しかしながら、最近クランクシヤフトのピン部
に形成する硬化層の幅や深さのばらつきの範囲に
対する要求はますます厳しくなつており、クラン
クシヤフトのピン部を高周波表面焼入コイルによ
つて所定の時間加熱するだけでは、この要求を満
たすことが困難になつて来た。Problems to be Solved by the Invention However, recently the requirements for the range of variation in the width and depth of the hardened layer formed on the pin portion of the crankshaft have become increasingly strict. It has become difficult to meet this requirement simply by heating for a predetermined period of time.
本発明は以上のことに鑑みてなされたもので、
クランクシヤフトのピン部に形成する硬化層の幅
や深さ等のばらつきが少なくなるクランクシヤフ
トのピン部の高周波表面焼入法を提供することを
目的としている。 The present invention has been made in view of the above,
It is an object of the present invention to provide a method for high-frequency surface hardening of the pin portion of a crankshaft, which reduces variations in the width, depth, etc. of the hardened layer formed on the pin portion of the crankshaft.
課題を解決するための手段
以上の課題を解決するために、本発明のクラン
クシヤフトのピン部の高周波表面焼入法は、半開
放鞍型の高周波表面焼入コイルをクランクシヤフ
トのピン部に載置し、クランクシヤフトを中心軸
のまわりに回転せしめつつ、クランクシヤフトの
各回転において、ピン部が、上死点の手前の所定
の位置と上死点との間の第１区間、および、上死
点と上死点の後の所定の位置との間の第２区間を
通過する間だけ、高周波表面焼入コイルに加える
電力を、第１、第２両区間以外の区間において高
周波表面焼入コイルに加える電力よりも小さい電
力とし、且つ、高周波表面焼入コイルへの通電の
開始を、ピン部が前記第２区間を通過後下死点に
至る間の所定の位置で行い、また、高周波表面焼
入コイルの通電の停止を、ピン部が下死点を通過
後前記第１区間に至る間の所定の位置で行う。Means for Solving the Problems In order to solve the above problems, the method for induction surface hardening of the pin portion of a crankshaft of the present invention involves mounting a semi-open saddle type high frequency surface hardening coil on the pin portion of the crankshaft. While rotating the crankshaft around the central axis, the pin part moves between the first section between the predetermined position before the top dead center and the top dead center, and the top dead center. Only while passing through the second section between the dead center and a predetermined position after the top dead center, the power applied to the high-frequency surface hardening coil is applied to the high-frequency surface hardening coil in sections other than both the first and second sections. The electric power is smaller than the electric power applied to the coil, and energization to the high-frequency surface-hardened coil is started at a predetermined position between the pin part passing through the second section and reaching the bottom dead center, and the high-frequency The energization of the surface hardening coil is stopped at a predetermined position after the pin portion passes the bottom dead center and reaches the first section.
実施例
第１図は本発明の一実施例であつて、クランク
シヤフトのピン部の高周波表面焼入れにおいて、
高周波表面焼入コイルへの高周波電流の通電のし
かたを示すグラフであつて、横軸はクランクシヤ
フトの回転角度を、縦軸は高周波表面焼入コイル
に通電される高周波電流の大きさを示す。第２図
は第３図に示したクランクシヤフトのピン部１２
の断面と高周波表面焼入コイル等を示す。第３図
は本実施例の方法によつて高周波表面焼入される
クランクシヤフトの正面図である。第４図は第３
図のピン部１２の拡大図である。Embodiment FIG. 1 shows an embodiment of the present invention, in which the pin portion of the crankshaft is subjected to induction surface hardening.
This is a graph showing how high-frequency current is applied to the high-frequency surface-hardened coil, where the horizontal axis represents the rotation angle of the crankshaft, and the vertical axis represents the magnitude of the high-frequency current applied to the high-frequency surface-hardened coil. Figure 2 shows the pin portion 12 of the crankshaft shown in Figure 3.
The cross section and the induction hardened coil etc. are shown. FIG. 3 is a front view of a crankshaft subjected to induction hardening by the method of this embodiment. Figure 4 is the third
It is an enlarged view of the pin part 12 of a figure.
第３図に示すように、クランクシヤフト１０は
一体形成されたピン部１１，１２，１３，１４、
およびジヤーナル部１５，１６，１７，１８，１
９を有している。このクランクシヤフト１０のピ
ン部やジヤーナル部を高周波表面焼入する場合に
は、センターピン等によつて、クランクシヤフト
１０の長手方向が水平になるように両端を保持
し、この状態でクランクシヤフト１０を回転しな
がら、高周波表面焼入コイルをピン部或いはジヤ
ーナル部に上方から接触させ、高周波表面焼入コ
イルに高周波電流を通電して行う。この高周波表
面焼入コイルは半開放鞍型コイルを使用する。 As shown in FIG. 3, the crankshaft 10 includes integrally formed pin parts 11, 12, 13, 14,
and journal parts 15, 16, 17, 18, 1
It has 9. When the pin portions and journal portions of the crankshaft 10 are subjected to induction surface hardening, hold both ends of the crankshaft 10 with a center pin or the like so that the longitudinal direction of the crankshaft 10 is horizontal. While rotating, the high frequency surface hardening coil is brought into contact with the pin portion or the journal portion from above, and a high frequency current is applied to the high frequency surface hardening coil. This high frequency surface hardening coil uses a semi-open saddle type coil.
第２図は上記の高周波表面焼入を説明するため
にクランクシヤフト１０のピン部１２の断面と高
周波表面焼入コイル等の示したものであつて、２
１はピン部１２の断面の中心であり、２２はクラ
ンクシヤフト１０の回転の中心、即ち任意のジヤ
ーナル部の断面の中心である。クランクシヤフト
１０を中心２２を中心として矢印Ｐ方向に回転さ
せることにより、ピン部１２の断面の中心２１は
中心２２を中心とする円弧２３の上を移動する。
即ち、ピン部１２は矢印Ｐ方向に公転しながら矢
印Ｑ方向に１公転につき一回の割合で自転する。 In order to explain the above-mentioned induction surface hardening, FIG.
1 is the center of the cross section of the pin portion 12, and 22 is the center of rotation of the crankshaft 10, that is, the center of the cross section of any journal portion. By rotating the crankshaft 10 about the center 22 in the direction of arrow P, the center 21 of the cross section of the pin portion 12 moves on a circular arc 23 about the center 22.
That is, the pin portion 12 rotates once per revolution in the direction of arrow Q while revolving in the direction of arrow P.
３０は高周波表面焼入コイルであつて、一対の
スペーサ３１，３１によつてピン部１２から所定
の距離隔てられており、ピン部１２の動きに対応
して、公知のパンタグラフ機構（図示省略）によ
つてピン部１２の運動に矢印ＲおよびＳの方向に
往復移動して追随する。３２はクランクシヤフト
１０の回転角度を検出する例えばロータリエンコ
ーダ等の回転角度検出器である。回転角度検出器
３２で検出したクランクシヤフト１０の回転角度
の信号は、信号線３３によつて、高周波表面焼入
コイル３０に通電する高周波電流の開閉を行う制
御器３４へ送られる。また、３５ａ，３５ｂ，３
５ｓおよび３５ｔは、ピン部１２の中心２１が後
述の点Ａ、Ｂ、ＳおよびＴに来たことを検出する
非接触式などのリミツトスイツチであり、図示し
ない信号線によつて制御器３４に接続されてい
る。 Reference numeral 30 denotes an induction hardened coil, which is separated from the pin part 12 by a predetermined distance by a pair of spacers 31, 31, and is connected to a known pantograph mechanism (not shown) in response to the movement of the pin part 12. As a result, it follows the movement of the pin portion 12 by reciprocating in the directions of arrows R and S. 32 is a rotation angle detector such as a rotary encoder for detecting the rotation angle of the crankshaft 10. A signal of the rotation angle of the crankshaft 10 detected by the rotation angle detector 32 is sent via a signal line 33 to a controller 34 that switches on and off the high frequency current that is applied to the high frequency surface hardening coil 30. Also, 35a, 35b, 3
5s and 35t are non-contact type limit switches that detect when the center 21 of the pin portion 12 comes to points A, B, S, and T, which will be described later, and are connected to the controller 34 by a signal line (not shown). has been done.
次に第１図および第２図によつて、本発明のク
ランクシヤフトのピン部の高周波表面焼入法を説
明する。クランクシヤフト１０を回転させてピン
部１２が最高の位置（上死点）にきた状態におけ
るピン部１２の断面の中心２１の位置を点Ｃとす
る。中心２１が点Ｃに来る手前で、クランクシヤ
フト１０の回転角度にして所定の角度θ（要求さ
れる硬化層の仕様に応じて通常15゜〜18゜の範囲の
中から選定される）の1/2であるθ／２であるよ
うな中心２１の位置を点Ａとする。また、中心２
１が点Ｃを過ぎて、クランクシヤフト１０の回転
角度にしてθ／２である位置を点Ｂとする。 Next, referring to FIGS. 1 and 2, the induction hardening method of the pin portion of the crankshaft of the present invention will be explained. Point C is the position of the center 21 of the cross section of the pin portion 12 when the crankshaft 10 is rotated and the pin portion 12 is at the highest position (top dead center). Before the center 21 reaches point C, the rotation angle of the crankshaft 10 is set to a predetermined angle θ (usually selected from a range of 15° to 18° depending on the specifications of the required hardened layer). Let point A be the position of the center 21 such that θ/2 is /2. Also, center 2
1 passes point C and the position where the rotation angle of the crankshaft 10 is θ/2 is defined as point B.
更に、クランクシヤフト１０の回転を開始して
後、最初に高周波表面焼入コイル３０に通電を開
始する位置および最後に通電を停止する位置にお
ける中心２１の位置をそれぞれ点Ｓおよび点Ｔと
する。点Ｓの位置は、ピン部１２が、点Ｂを通過
後下死点（上死点の反対点）に至る間の区間内の
所定の位置に選定される。また、点Ｔの位置は、
ピン部１２が下死点を通過後点Ａに至る間の区間
内の所定の位置に選定される。 Further, after the rotation of the crankshaft 10 is started, the positions of the center 21 at the first position where energization is started and the last position where energization is stopped are defined as points S and T, respectively. The position of the point S is selected to be a predetermined position within the section during which the pin part 12 reaches the bottom dead center (the opposite point of the top dead center) after passing the point B. Also, the position of point T is
The pin portion 12 is selected at a predetermined position within the section between passing the bottom dead center and reaching the point A.
これは、もしも、点Ａから点Ｃを通り点Ｂに至
るまでの区間の途中、即ち、高周波表面焼入コイ
ル３０への印加電力低減中に通電の停止をした
り、或いは通電の開始が低減電力で開始されたり
する場合に形成された硬化層と、電力低減を行つ
ていないときに通電の開始、停止をして形成され
た硬化層との間に、相違が発生することを防止す
るものである。 This means that if the energization is stopped in the middle of the section from point A to point C to point B, that is, while the power applied to the high-frequency surface hardening coil 30 is being reduced, or if the start of energization is reduced. To prevent a difference from occurring between a hardened layer formed when starting with electric power and a hardened layer formed by starting and stopping energization when power is not reduced. It is something.
そして、これら点Ｓおよび点Ｔの位置の選定
は、要求される硬化層の幅、深さおよびそれらの
ばらつき等に従つて、ｎ（正の整数であつて、高
周波表面焼入コイル３０に通電開始後のクランク
シヤフト１０の回転数を表す）とともに、予め設
定される。また中心２１が点Ｃから点Ｓへ、およ
び点Ｓから点Ｔへ矢印Ｐ方向に移動したときの、
クランクシヤフト１０の回転角度をそれぞれα1お
よびα2とする。第１図の点Ａ、Ｂ、Ｃ、Ｓおよび
Ｔは、それぞれ第２図の点Ａ、Ｂ、Ｃ、Ｓおよび
Ｔに対応している。 The positions of these points S and T are selected according to the required width and depth of the hardened layer, their variations, etc. (represents the rotation speed of the crankshaft 10 after the start) and is set in advance. Also, when the center 21 moves from point C to point S and from point S to point T in the direction of arrow P,
Let the rotation angles of the crankshaft 10 be α 1 and α 2 , respectively. Points A, B, C, S and T in FIG. 1 correspond to points A, B, C, S and T in FIG. 2, respectively.
まず高周波表面焼入コイル３０に通電しない状
態でクランクシヤフト１０の回転を開始する。ピ
ン部１２の中心２１が点Ｃを通過後点Ｓに来たこ
とをリミツトスイツチ３５ｓによつて検出し、制
御器３４は高周波表面焼入コイル３０に高周波電
流の通電を開始する。その後中心２１が点Ａに来
たことをリミツトスイツチ３５ａが検出し、制御
器３４によつて高周波電流の大きさを第１図に示
すように低くする。中心２１が点Ｓから点Ａに至
る間に、クランクシヤフト１０は回転角度にして
（360゜−θ／２−α1）だけ回転する。次いで中心
２１が点Ｃを通過して点Ｂに来たことをリミツト
スイツチ３５ｂが検出し、制御器３４によつて、
高周波電流の大きさを元の大きさに戻す。中心２
１が点Ａから点Ｂへ至る間に、クランクシヤフト
１０は回転角度にしてθだけ回転する。次いで中
心２１が点Ｓ、点Ｔを通過して点Ａにいたるま
で、元の大きさの高周波電流の通電を続け、中心
２１が点Ａに来たことをリミツトスイツチ３５ａ
が検出し、制御器３４によつて再び高周波電流の
大きさを低くする。中心２１が点Ｂから点Ａへ至
る間に、クランクシヤフト１０は回転角度にして
（360゜−θ）だけ回転する。 First, the rotation of the crankshaft 10 is started with no current applied to the high frequency surface hardening coil 30. The limit switch 35s detects that the center 21 of the pin portion 12 has passed through the point C and reached the point S, and the controller 34 starts supplying high-frequency current to the high-frequency surface hardening coil 30. Thereafter, the limit switch 35a detects that the center 21 has come to point A, and the controller 34 lowers the magnitude of the high frequency current as shown in FIG. While the center 21 moves from point S to point A, the crankshaft 10 rotates by a rotation angle of (360°-θ/2-α 1 ). Next, the limit switch 35b detects that the center 21 has passed through the point C and reached the point B, and the controller 34
Return the high frequency current to its original size. center 2
1 from point A to point B, the crankshaft 10 rotates by a rotation angle θ. Next, the high-frequency current of the original magnitude continues to be applied until the center 21 passes through points S and T and reaches point A, and when the center 21 has reached point A, the limit switch 35a is activated.
is detected, and the magnitude of the high frequency current is reduced again by the controller 34. While the center 21 moves from point B to point A, the crankshaft 10 rotates by a rotation angle of (360°-θ).
以後は上記と同様の通電のサイクルを繰り返し
て行う。しかして、中心２１が最初に点Ｓを通過
直後から、所定の回転角度回転、即ちnx360゜回転
して点Ｓに再び位置し、次いでこの点Ｓからクラ
ンクシヤフト１０が回転角度にしてα2だけ回転し
た位置、点Ｔに中心２１が来たことをリミツトス
イツチ３５ｔによつて検出し、制御器３４によつ
て高周波表面焼入れコイル３０への通電を停止し
てピン部１２の加熱を終了する。即ち、高周波表
面焼入れコイル３０への通電は、クランクシヤフ
ト１０が、ｎ×360゜＋α2の角度回転する間行わ
れ、その間の１回転毎において中心２１が点Ａか
ら点Ｂに至る間は、高周波電流の大きさが低減さ
れていることになる。 Thereafter, the same energization cycle as above is repeated. Immediately after the center 21 passes point S for the first time, it rotates by a predetermined rotation angle, that is, nx360°, and is located again at point S, and then from this point S, the crankshaft 10 rotates by α 2 in rotation angle. The limit switch 35t detects that the center 21 has come to the rotated position, point T, and the controller 34 stops energizing the high-frequency surface hardening coil 30 to end the heating of the pin portion 12. That is, energization to the high-frequency surface hardening coil 30 is performed while the crankshaft 10 rotates through an angle of n x 360° + α 2 , and while the center 21 moves from point A to point B during each rotation during that time, This means that the magnitude of the high frequency current is reduced.
なお、第４図に示すように、ピン部１２には円
柱部１２１とこれに続くＲ部１２２と、Ｒ部１２
２に続きクランクシヤフトの長手方向（矢印Ａ方
向）に直角な方向に形成されたフイレツト部１２
３がある。硬化層１２５は前記円柱部１２１のみ
に対して形成されたものであつて、このように硬
化層を形成することをフラツト焼入れという。ま
た硬化層１２６は前記円柱部１２１、Ｒ部１２２
およびフイレツト部１２３の全てに対して形成さ
れたものであつて、このように硬化層を形成する
ことをＲ焼入れという。本実施例のクランクシヤ
フトのピン部の高周波表面焼入法は、前記フラツ
ト焼入とＲ焼入れのいずれの焼入れに対しても適
用できるものである。 In addition, as shown in FIG.
2, a fillet portion 12 formed in a direction perpendicular to the longitudinal direction (direction of arrow A) of the crankshaft.
There are 3. The hardened layer 125 is formed only on the cylindrical portion 121, and forming the hardened layer in this way is called flat hardening. Further, the hardened layer 126 includes the columnar part 121 and the R part 122.
The hardened layer is formed on all of the fillet portions 123, and forming a hardened layer in this manner is called R hardening. The high frequency surface hardening method of the pin portion of the crankshaft of this embodiment can be applied to both the flat hardening and R hardening.
発明の効果
以上説明したように本発明によれば、回転駆動
されるクランクシヤフトのピン部を高周波表面焼
入するために、ピン部が上死点の前後の第１、第
２区間を通過するときに、高周波表面焼入コイル
に印加する電力を、それ以外の区間よりも小さく
し、且つ、高周波表面焼入コイルへの通電の開始
をピン部が前記第２区間を通過後下死点に至る間
の所定の位置で行い、また、高周波表面焼入コイ
ルへの通電の停止をピン部が下死点を通過後前記
第１区間に至る間の所定の位置で行つている。Effects of the Invention As explained above, according to the present invention, in order to perform induction surface hardening on the pin portion of a rotationally driven crankshaft, the pin portion passes through the first and second sections before and after the top dead center. Sometimes, the electric power applied to the high-frequency surface-hardened coil is made smaller than that in other sections, and the power applied to the high-frequency surface-hardened coil is stopped at the bottom dead center after the pin passes through the second section. In addition, energization to the high-frequency surface hardening coil is stopped at a predetermined position between the pin portion passing the bottom dead center and the first section.
従つて、本発明のクランクシヤフトのピン部の
高周波表面焼入法によれば、ピン部に形成された
硬化層の幅や深さのばらつきを少なくするこがで
きる。 Therefore, according to the high-frequency surface hardening method of the crankshaft pin portion of the present invention, variations in the width and depth of the hardened layer formed on the pin portion can be reduced.
第１図は本発明の一実施例であつて、クランク
シヤフトの高周波表面焼入において、高周波表面
焼入コイルに高周波電流を通電する方法を示すグ
ラフであつて、横軸はクランクシヤフトの回転角
度を、縦軸は高周波電流の大きさを示す。第２図
は第３図に示したクランクシヤフトのピン部１２
の断面と高周波表面焼入コイル等を示す。第３図
は本実施例の方法によつて高周波表面焼入される
クランクシヤフトの正面図である。第４図は第３
図のピン部１２の拡大図である。
１１，１２，１３，１４……ピン部、１５，１
６，１７，１８，１９……ジヤーナル部、２１…
…中心、２２……中心、２３……円弧、３０……
高周波表面焼入コイル、３１……スペーサ、３２
……回転角度検出器、３４……制御器、３５ａ，
３５ｂ，３５ｓ，３５ｔ……リミツトスイツチ。
FIG. 1 is an embodiment of the present invention, and is a graph showing a method of applying high-frequency current to a high-frequency surface hardening coil in high-frequency surface hardening of a crankshaft, in which the horizontal axis represents the rotation angle of the crankshaft. , the vertical axis shows the magnitude of high-frequency current. Figure 2 shows the pin part 12 of the crankshaft shown in Figure 3.
The cross section and the induction hardened coil etc. are shown. FIG. 3 is a front view of a crankshaft subjected to induction hardening by the method of this embodiment. Figure 4 is the third
It is an enlarged view of the pin part 12 of a figure. 11, 12, 13, 14...pin part, 15, 1
6, 17, 18, 19... journal section, 21...
...center, 22...center, 23...arc, 30...
High frequency surface hardening coil, 31...Spacer, 32
...Rotation angle detector, 34...Controller, 35a,
35b, 35s, 35t...limit switch.
Claims (1)
クシヤフトのピン部に載置し、クランクシヤフト
を中心軸のまわりに回転せしめつつ、クランクシ
ヤフトの各回転において、ピン部が、上死点の手
前の所定の位置と上死点との間の第１区間、およ
び、上死点と上死点の後の所定の位置との間の第
２区間を通過する間だけ、高周波表面焼入コイル
に加える電力を、第１、第２両区間以外の区間に
おいて高周波表面焼入コイルに加える電力よりも
小さい電力とし、且つ、高周波表面焼入コイルへ
の通電の開始を、ピン部が前記第２区間を通過後
下死点に至る間の所定の位置で行い、また、高周
波表面焼入コイルへの通電の停止を、ピン部が下
死点を通過後前記第１区間に至る間の所定の位置
で行うことを特徴とするクランクシヤフトのピン
部の高周波表面焼入法。1 A half-open saddle-shaped high-frequency surface-hardened coil is placed on the pin of the crankshaft, and while the crankshaft is rotating around the central axis, the pin is positioned just before top dead center during each rotation of the crankshaft. The high-frequency surface-hardened coil only passes through a first section between a predetermined position and top dead center, and a second section between top dead center and a predetermined position after top dead center. The applied power is smaller than the power applied to the high-frequency surface hardening coil in sections other than the first and second sections, and the pin portion is configured to start energizing the high-frequency surface hardening coil in the second section. The pin part passes through the bottom dead center at a predetermined position before reaching the bottom dead center, and the energization to the high-frequency surface hardening coil is stopped at a predetermined position after the pin passes through the bottom dead center until the pin reaches the first section. An induction hardening method for the surface of crankshaft pins.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63013348A JPH01188624A (en) | 1988-01-22 | 1988-01-22 | High-frequency surface hardening method for crank shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63013348A JPH01188624A (en) | 1988-01-22 | 1988-01-22 | High-frequency surface hardening method for crank shaft |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01188624A JPH01188624A (en) | 1989-07-27 |
| JPH0515766B2 true JPH0515766B2 (en) | 1993-03-02 |
Family
ID=11830605
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63013348A Granted JPH01188624A (en) | 1988-01-22 | 1988-01-22 | High-frequency surface hardening method for crank shaft |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01188624A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5745453A (en) * | 1980-09-02 | 1982-03-15 | Kiyoo Yajima | Controlled blood serum |
| JPS5969516A (en) * | 1982-10-12 | 1984-04-19 | Fuji Denshi Kogyo Kk | Crankshaft |
| JPS6328826A (en) * | 1986-07-23 | 1988-02-06 | Komatsu Ltd | Induction hardening method for crankshaft |
-
1988
- 1988-01-22 JP JP63013348A patent/JPH01188624A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5745453A (en) * | 1980-09-02 | 1982-03-15 | Kiyoo Yajima | Controlled blood serum |
| JPS5969516A (en) * | 1982-10-12 | 1984-04-19 | Fuji Denshi Kogyo Kk | Crankshaft |
| JPS6328826A (en) * | 1986-07-23 | 1988-02-06 | Komatsu Ltd | Induction hardening method for crankshaft |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01188624A (en) | 1989-07-27 |
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