Spider

説明

Forged Aluminum Bicycle Spider (Flat): Five-Arm Chainring Carrier

The forged aluminum bicycle spider is the five-arm carrier in a crankset that holds the chainrings. It has a central round hub with five arms extending outward, each machined at its tip with a bolt hole for the chainring. This flat version keeps the arms roughly in the same plane as the hub for a simple, light structure.

The spider carries pedaling torque from the crank to the chainrings, and the arm roots are stress concentrations. Al Forge Tech (AFT) hot forges the spider so grain flow runs continuously from the hub into all five arms, with a recessed hub to save weight. After heat treatment, the central spline or mounting bore and the arm bolt holes are CNC-machined, and the bolt circle diameter (BCD) and indexing are confirmed on CMM.

主な機能

Five arms and hub forged in one piece with continuous grain flow at arm roots
Flat design for a simple, light structure
Bolt circle diameter (BCD) and indexing CNC-machined
BCD and flatness verified on CMM

Forged Aluminum Bicycle Spider (Flat) Specifications and Manufacturing Capability

商品	詳細
製品カテゴリー	Aluminum Forging Bicycle Parts
申請	Chainring carriers for bicycle cranksets
主なプロセス	閉型熱間鍛造（熱間鍛造プレス：600T～8,000T）
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

Forged Aluminum Bicycle Spider (Flat) 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。.
熱間鍛造600T～8,000Tの熱間鍛造プレスでの閉型成形により、部品の形状に沿った連続した粒状流が生成されます。.
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 spider BCD accuracy important?

The BCD (bolt circle diameter) is the circle on which the chainring bolt holes lie and determines whether the chainring mounts correctly. Errors in BCD or indexing can make the chainring wobble, affecting shifting and chain running. AFT machines all five bolt holes in one CNC setup and measures BCD, indexing and flatness on Zeiss CMM.

How does the flat spider differ from the stepped spider?

In the flat spider the arms lie roughly in the plane of the hub, suiting single-ring setups or designs where the chainring sits flush on the spider. The stepped spider has a deeper hub and arms with a height change, giving a specific offset between chainring and hub to suit different chainline requirements. AFT can develop either style to the brand’s drawing.

How does a forged aluminum Forged Aluminum Bicycle Spider (Flat) compare with casting or machining from billet?

Forging shapes aluminum in the solid state under pressure, so the grain flow follows the part contour and the porosity and shrinkage common in castings are avoided. Compared with machining from solid billet, a near-net-shape forging removes less material and shortens machining time. For a Forged Aluminum Bicycle Spider (Flat) under repeated loads, forging balances strength and weight; the final choice still depends on design loads and volume.

How do you keep the Forged Aluminum Bicycle Spider (Flat) 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 Forged Aluminum Bicycle Spider (Flat) stable across lots.

Can the Forged Aluminum Bicycle Spider (Flat) 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 Forged Aluminum Bicycle Spider (Flat) can be evaluated together.

Request a Quote for the Forged Aluminum Bicycle Spider (Flat)

Developing a new Forged Aluminum Bicycle Spider (Flat) 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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