Steer Tube

説明

Aluminum Bicycle Steerer Tube: Variable-Diameter Fork Steerer

The aluminum bicycle steerer tube is the steering column of a fork. Its upper end passes through the frame’s head tube and is clamped by the stem, while its lower end joins the fork crown. This version is a long slender tube with a change in outer diameter and a thickened lower section for press-fitting or joining to the crown and for carrying bending loads from steering and braking; variable-diameter designs are also common in tapered head tube systems with different upper and lower bearing sizes.

The joint between steerer and crown sees the highest bending stress and needs a thicker wall, while the upper section can use a thinner wall to save weight. Al Forge Tech (AFT) evaluates cold forming for the diameter change and wall thickness, finish-turns the outer diameter and joint section, and inspects diameter, roundness and straightness on CMM. Anodizing is available.

主な機能

Thickened, stepped lower section strengthens the crown joint
Thin-wall upper section saves weight
OD, roundness and straightness finish-turned and measured
Can be developed together with the triple clamp

Aluminum Bicycle Steerer Tube Specifications and Manufacturing Capability

商品	詳細
製品カテゴリー	Aluminum Forging Bicycle Parts
申請	Fork steerer tubes for bicycles and e-bikes
主なプロセス	Cold forming (cold forging presses 260T–2,500T), evaluated by diameter change and wall thickness
素材	お客様の仕様に合わせて選択可能。2xxx、5xxx、6xxx、7xxx シリーズのアルミニウム合金（例：2014、6061、6082、7075）
熱処理	合金および強度要件による社内T4処理（8ユニット）およびT6人工老化（7ユニット）
二次加工	CNC加工（52台の加工センター、30台の旋盤）、バリ取り、振動仕上げ
表面仕上げ	必要に応じて、陽極酸化（硬陽極酸化を含む）、ショットブラスト、電子コーティングまたは塗装
検査	ザイツCMM（4台）、硬度計、分光計、蛍光透過検査ライン
寸法と公差	顧客ごとに2D/3D図面
品質システム	IATF 16949:2016、ISO 14001:2015

Aluminum Bicycle Steerer Tube Manufacturing Process

ドローイングレビューとDFM合金、荷重方向、重要な寸法を確認し、その後 QForm シミュレーションを実行して金属流動と欠陥リスクを予測します。.
デザインと製造ダイセットの数（例えば、ブロッカーダイとファイニッシャーダイ）は部品の複雑さに合わせて計画されており、ダイの形状は携帯型3Dスキャナーで確認されます。.
Cold forging: cold forming on 260T–2,500T presses, suited to thin-walled, tubular and dimensionally repeatable parts.
熱処理T4溶液処理とT6人工老化は社内で実施され、合金および強度要件によって設定されたパラメータが使用されます。.
CNC加工そして仕上げ穴、スレッド、接合面は機械加工され、その後、必要に応じてバリ取り、振動仕上げ、ショットブラスト、または陽極酸化が行われます。.
検査と発送寸法、硬度、化学組成はCMM、硬度計、分光計を用いて確認され、ロットのトレーサビリティはIATF 16949に従って管理されています。.

よくある質問

Why is the lower end of the steerer thickened?

When riding and braking, front-wheel loads pass through the fork to the lower end of the steerer, where it joins the crown and bending stress is highest. The lower end therefore needs a thicker wall and larger diameter, while the less-stressed upper section can use a thinner wall to save weight. This variable section balances weight and strength.

Can AFT produce both the steerer tube and the triple clamp?

Yes. AFT produces both bicycle triple clamps and steerer tubes and can plan their fit dimensions and tolerances together from the fork assembly drawing, for example press-fit interference or joining method, with unified alloy and heat treatment specifications to reduce assembly fit issues.

How do you keep the Aluminum Bicycle Steerer Tube consistent from lot to lot?

Al Forge Tech runs incoming (IQC), in-process (IPQC) and final (FQC) inspection under IATF 16949:2016, supported by 4 Zeiss CMMs, hardness testers, a spectrometer and a fluorescent penetrant inspection line. First, middle and last pieces of every lot are checked against the die; when wear causes dimensional drift, the die is reworked to keep the Aluminum Bicycle Steerer Tube stable across lots.

Can the Aluminum Bicycle Steerer Tube be anodized or given other surface finishes?

Yes. Al Forge Tech offers anodizing (including hard anodizing), shot blasting, vibratory finishing, e-coating and painting, plus pickling and ultrasonic washing lines to clean parts after machining. Please note the finish type and film thickness on the drawing so machining allowances and cosmetic standards for the Aluminum Bicycle Steerer Tube can be evaluated together.

What information do you need to quote the Aluminum Bicycle Steerer Tube?

Please send a 3D model and 2D drawing, alloy grade and temper, critical tolerances, surface finish requirements, estimated annual volume and target delivery date. Complete data lets our engineers judge forging feasibility, the number of die sets and the machining scope for the Aluminum Bicycle Steerer Tube at the quotation stage. If the design is still conceptual, a sketch is enough to start a DFM discussion.

Request a Quote for the Aluminum Bicycle Steerer Tube

Developing a new Aluminum Bicycle Steerer Tube or converting an existing part to aluminum forging? Send us your 3D/2D drawings, alloy and temper, annual volume and finishing requirements. Our engineering team will reply with a feasibility review, die plan and quotation.

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類似のパーツを比較するには、閲覧してください。 Aluminum Forging Bicycle Parts そして私たちの自動車用アルミニウム鍛造用途, または、こちらをご覧ください会社紹介当社の設備および認証について。.

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