JP2687591B2 - Cylinder head bore finishing method - Google Patents
Cylinder head bore finishing methodInfo
- Publication number
- JP2687591B2 JP2687591B2 JP1148497A JP14849789A JP2687591B2 JP 2687591 B2 JP2687591 B2 JP 2687591B2 JP 1148497 A JP1148497 A JP 1148497A JP 14849789 A JP14849789 A JP 14849789A JP 2687591 B2 JP2687591 B2 JP 2687591B2
- Authority
- JP
- Japan
- Prior art keywords
- bore
- quench
- grindstone
- cylinder head
- honing
- 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
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Description
【発明の詳細な説明】 （イ）産業上の利用分野 本発明は、シリンダヘッドボアの仕上方法に関するも
のである。TECHNICAL FIELD The present invention relates to a method for finishing a cylinder head bore.
（ロ）従来の技術 エンジンのシリンダブロックボアの焼入れ方法とし
て、例えば実開昭63−24347号公報に示されように、レ
ーザビームをボアに照射するようにしたものがある。レ
ーザビームはボアに対して例えば軸方向に照射される。
すなわち、ボア円周方向に所定間隔をおいてボア軸方向
に伸びる帯状の焼入れ硬化部が形成される。焼入れ後、
ボアはホーニング加工される。ホーニング加工は、砥石
を有するホーニングヘッドを回転させつつ軸方向に往復
運動させることにより、ボアの仕上を行なう加工であ
る。角形棒状のホーニング用砥石は砥石ホルダーの円筒
母線に沿って配置され、例えば、ばねの力によりボアに
押付けられる。(B) Conventional Technology As a method of quenching a cylinder block bore of an engine, there is a method of irradiating a laser beam to the bore as disclosed in, for example, Japanese Utility Model Laid-Open No. 63-24347. The laser beam is applied to the bore in the axial direction, for example.
That is, band-shaped quench-hardened portions extending in the bore axial direction are formed at predetermined intervals in the bore circumferential direction. After quenching,
The bore is honed. The honing process is a process of finishing the bore by rotating the honing head having a grindstone and reciprocating in the axial direction. The square rod-shaped honing stone is arranged along the cylindrical generatrix of the grindstone holder and is pressed against the bore by the force of a spring, for example.
（ハ）発明が解決しようとする課題 しかしながら、上記のような従来のシリンダヘッドボ
アの仕上方法では、ボアの充分な真円度を得ることがで
きないという問題点がある。すなわち、ボア軸方向の焼
入れ硬化部は円周方向に所定間隔を置いて配列されてい
る。従って、円周方向には硬度の高い部分と低い部分と
が交互に存在することになる。このため、硬度が低い部
分では砥石によって大きく切削され、一方、硬度が高い
部分では切削量が少なくなる。このため、ボアの断面形
状に凹凸を生じ、所望どおりの真円度が得られないこと
になる。本発明はこのような課題を解決することを目的
としている。(C) Problems to be Solved by the Invention However, the conventional method of finishing a cylinder head bore as described above has a problem that it is not possible to obtain sufficient roundness of the bore. That is, the quench-hardened parts in the bore axis direction are arranged at predetermined intervals in the circumferential direction. Therefore, high hardness portions and low hardness portions are alternately present in the circumferential direction. For this reason, a portion having a low hardness is largely cut by the grindstone, while a portion having a high hardness has a small cutting amount. Therefore, the cross-sectional shape of the bore is uneven, and the desired roundness cannot be obtained. An object of the present invention is to solve such a problem.
（ニ）課題を解決するための手段 本発明は、ホーニングヘッドの砥石を円筒母線に対し
て傾斜させることにより、上記課題を解決する。すなわ
ち、本発明によるシリンダヘッドボアの仕上方法は、ボ
ア軸方向に複数の帯状の焼入れ硬化部を有するボアを対
象としたものであり、円周方向位置にかかわらず少なく
とも１本の焼入れ硬化部と接触するように砥石ホルダー
の円筒母線に対して傾斜した部分を有する砥石を備えた
ホーニングヘッドを用いてホーニング加工することを特
徴としている。(D) Means for Solving the Problems The present invention solves the above problems by inclining the grindstone of the honing head with respect to the cylindrical generatrix. That is, the method for finishing a cylinder head bore according to the present invention is intended for a bore having a plurality of strip-shaped quench hardened portions in the axial direction of the bore, and has at least one quench hardened portion regardless of the circumferential position. It is characterized by honing using a honing head provided with a grindstone having a portion inclined to the cylindrical generatrix of the grindstone holder so as to be in contact with each other.
（ホ）作用 砥石は、円筒母線に対して傾斜した部分を有してお
り、円周方向位置にかかわらず少なくとも１本の焼入れ
硬化部に接触するように構成されている。このため、砥
石の突出量は焼入れ硬化部によって決定されることにな
る。従って、硬度が低い部分で砥石がより大きく突出し
て切削量が増大するという事態の発生が防止され、ボア
全周にわたって均一な切削量とすることができる。これ
により、ボアの真円度が向上する。(E) Action The grindstone has a portion inclined with respect to the cylindrical generatrix and is configured to come into contact with at least one quench-hardened portion regardless of the position in the circumferential direction. For this reason, the amount of protrusion of the grindstone is determined by the quench hardening portion. Therefore, it is possible to prevent the situation where the cutting amount increases due to the whetstone protruding further in the portion having low hardness, and the cutting amount can be made uniform over the entire circumference of the bore. This improves the roundness of the bore.
（ヘ）実施例 まず、第１図に示すように、シリンダブロック10のボ
ア12にレーザビームを照射することにより、焼入れを行
なう。レーザビームをボア12の軸方向に移動させ、ボア
軸方向に伸びる帯状の焼入れ硬化部14を円周方向に所定
間隔で多数形成する。次いで、第２図に示すホーニング
ヘッド16を用いて、第３図に示すようにホーニング加工
を行なう。ホーニングヘッド16の砥石18は砥石ホルダー
20の円筒母線に対して傾斜した部分、すなわちらせん状
に配置された部分を有している。これにより、砥石18が
どのような円周方向位置にあっても少なくとも砥石18の
一部が焼入れ硬化部14と接触する状態となっている。す
なわち、砥石18が焼入れ硬化部14間の硬度の低い部分に
のみ接触するという状態は発生しないようにしてある。
従って、例えばばねによって半径方向外方に押されてい
る砥石18の突出し量は硬度の高い焼入れ硬化部14によっ
て決定され、ボア12の全周にわたって切削量が一定とな
る。これにより、ボア12の真円度は非常に高いものとな
る。(F) Embodiment First, as shown in FIG. 1, quenching is performed by irradiating the bore 12 of the cylinder block 10 with a laser beam. The laser beam is moved in the axial direction of the bore 12 to form a large number of band-shaped quench-hardened portions 14 extending in the axial direction of the bore at predetermined intervals in the circumferential direction. Then, using the honing head 16 shown in FIG. 2, honing is performed as shown in FIG. The grinding wheel 18 of the honing head 16 is a grinding wheel holder
It has a portion inclined with respect to the cylindrical generatrix of 20, that is, a portion arranged in a spiral shape. As a result, at least part of the grindstone 18 is in contact with the quench-hardened portion 14 regardless of the circumferential position of the grindstone 18. That is, the state where the grindstone 18 contacts only the low hardness portion between the quench-hardened portions 14 is prevented.
Therefore, the protruding amount of the grindstone 18 pushed outward in the radial direction by, for example, a spring is determined by the quench-hardened portion 14 having high hardness, and the cutting amount becomes constant over the entire circumference of the bore 12. As a result, the roundness of the bore 12 becomes extremely high.
（ト）発明の効果 以上説明してきたように、本発明によると、少なくと
も一部分が常に焼入れ硬化部に接触するように傾斜した
砥石を用いてホーニング加工を行なうようにしたので、
焼入れ硬化部がボア軸方向に形成されている場合であっ
てもボアの高い真円度を得ることができる。(G) Effect of the Invention As described above, according to the present invention, since the honing process is performed by using the grindstone inclined so that at least a part is always in contact with the quench-hardened portion,
Even if the quench-hardened portion is formed in the bore axial direction, a high roundness of the bore can be obtained.
第１図はシリンダブロックを示す図、第２図はホーニン
グヘッドを示す図、第３図はホーニングヘッドによって
ボアを加工している状態を示す図である。 10……シリンダブロック、12……ボア、14……焼入れ硬
化部、16……ホーニングヘッド、18……砥石、20……砥
石ホルダー。FIG. 1 is a diagram showing a cylinder block, FIG. 2 is a diagram showing a honing head, and FIG. 3 is a diagram showing a state in which a bore is processed by the honing head. 10 …… Cylinder block, 12 …… Boa, 14 …… Quench hardening part, 16 …… Honing head, 18 …… Grinding stone, 20 …… Grinding stone holder.
Claims (1)
ボア軸方向に複数の帯状の焼入れ硬化部が形成されてい
るシリンダヘッドボアの仕上方法において、 円周方向位置にかかわらず少なくとも１本の焼入れ硬化
部と接触するように砥石ホルダーの円筒母線に対して傾
斜した部分を有する砥石を備えたホーニングヘッドを用
いてホーニング加工することを特徴とするシリンダヘッ
ドボアの仕上方法。1. A method of finishing a cylinder head bore in which a plurality of band-shaped quench-hardened portions are formed in the bore axis direction by irradiating a high-energy beam, wherein at least one quench-hardened regardless of the circumferential position. A method for finishing a cylinder head bore, which comprises honing using a honing head provided with a grindstone having a portion inclined with respect to a cylindrical generatrix of a grindstone holder so as to come into contact with a portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1148497A JP2687591B2 (en) | 1989-06-13 | 1989-06-13 | Cylinder head bore finishing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1148497A JP2687591B2 (en) | 1989-06-13 | 1989-06-13 | Cylinder head bore finishing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0319763A JPH0319763A (en) | 1991-01-28 |
| JP2687591B2 true JP2687591B2 (en) | 1997-12-08 |
Family
ID=15454077
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1148497A Expired - Lifetime JP2687591B2 (en) | 1989-06-13 | 1989-06-13 | Cylinder head bore finishing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2687591B2 (en) |
-
1989
- 1989-06-13 JP JP1148497A patent/JP2687591B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0319763A (en) | 1991-01-28 |
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