Spider

描述

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.

主要功能

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
產品類別	Aluminum Forging Bicycle Parts
申請	Chainring carriers for bicycle cranksets
主要過程	閉式熱鍛造（熱鍛造壓機 600T–8,000T）
材質	Selected to customer specification; 2xxx, 5xxx, 6xxx and 7xxx series aluminum alloys available (e.g. 2014, 6061, 6082, 7075)
熱處理	根據合金與強度要求而提供的內部 T4 處理方案（8 套）及 T6 人工老化處理方案（7 套）
二次加工	CNC 加工（52 台加工中心、30 台銑床）、銑削、振動磨削
表面處理	按要求進行陽極氧化（包括硬陽極氧化）、噴射粉碎、電子塗層或塗漆。
檢查	Zeiss CMM (4 units), hardness testers, spectrometer, fluorescent penetrant inspection line
尺寸與公差	按客戶提供2D/3D圖紙
品質管理系統	IATF 16949:2016、ISO 14001:2015

Forged Aluminum Bicycle Spider (Flat) Manufacturing Process

繪圖評估與 DFM我們確認合金、載荷方向和關鍵尺寸，然後執行 QForm 模擬，以預測金屬流動和缺陷風險。.
設計與製造銑刀組數（例如，阻斷刀和完成刀）視零件的複雜程度而定，銑刀輪廓則使用便攜式3D掃描儀進行檢查。.
熱鍛造600T–8,000T 熱鍛造壓 Presses 的閉式成形技術創造出持續的晶粒流，並遵循零件的輪廓。.
熱處理T4 溶液處理和 T6 人工老化處理均在廠內進行，參數由合金和強度要求設定。.
CNC加工以及完成孔、螺紋和接合面均經過機械加工，然後根據需要進行拋光、振動拋光、噴丸或陽極氧化處理。.
檢查與運輸尺寸、硬度及化學成分均通過 CMM、硬度測試儀及分光光度儀進行驗證，且所有批次的產品均遵照 IATF 16949 的標準進行追蹤。.

常見問題

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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若要比較相似的零件，請瀏覽 Aluminum Forging Bicycle Parts 以及我們的汽車鋁合金鍛造應用, 或參觀公司簡介關於我們的設備與認證。.

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