KOTHAR / TOOLING-FREE RAPID CASTING

Aluminium castings · no mould, no tooling charge鋁合金鑄件 · 不開模具、無模具費

A real casting, in your production alloy, before you spend anything on tooling. 在開模之前,先鑄一件真的出來。

A die-casting tool costs six figures and takes 90–120 days. We pour your part in the same alloy, by a casting process — from a 3D-printed pattern, with no tooling at all — so you find the shrinkage, the misrun and the thin-wall fill before the steel is cut. 一套壓鑄模動輒數十萬、等上 90~120 天。我們用同一種合金、以鑄造製程把你的件澆出來 —— 白模 3D 列印,完全不開模 —— 讓你在切鋼料之前就看到縮孔、冷隔與薄壁充填。

Aluminium poured into a fired ceramic shell. Footage from our production partner's foundry.鋁液澆入已焙燒的陶瓷殼型。畫面攝於合作產線。

t As-cast surface, not machined 鑄態表面,非切削面 Real fill path — sees misrun 真實充填路徑 — 看得出冷隔 A356.2-T6, same as production A356.2-T6,與量產同材
Fig. 1 — Sectioned housing. What a machined prototype cannot show you. 圖一 — 殼體剖面。切削樣品看不到的東西。 SECTION A–A
01 — The problem01 — 問題

A machined prototype is the wrong material in the wrong condition. 切削樣品的材料狀態,跟你的量產件不一樣。

Every fast prototyping route gives you a part that looks right. None of the usual ones give you a part that solidified like your production part will — and solidification is where casting defects come from. 所有快速打樣的路線都能給你一個「看起來對」的件。但一般那幾條路,沒有一條給你的件是照量產那樣凝固出來的 —— 而鑄造缺陷全部出在凝固這一段。

What you usually get一般拿到的

  • CNC from bar stock — wrought 6061/7075. No porosity, no shrink, no fill path. It cannot fail the way your casting will.
  • CNC 從實心料切 —— 鍛材 6061/7075。沒有氣孔、沒有縮孔、沒有充填路徑。它不可能用你的鑄件會壞的方式壞掉。
  • Metal 3D printing (SLM) — rapidly solidified microstructure, nothing like a sand or foam casting. And expensive.
  • 金屬 3D 列印(SLM) —— 快速凝固組織,跟砂型或消失模完全不同,而且很貴。
  • A soft tool — which is the exact spend you were trying to avoid.
  • 開軟模 —— 那正是你想避開的那筆錢。

What we give you我們給的

  • A casting. Poured into a ceramic shell, in your production alloy, with a real gate and riser and a real fill path.
  • 一件真鑄件。澆進陶瓷殼型,用你的量產合金,有真的澆口與冒口、真的充填路徑。
  • Section it, X-ray it, pull a tensile bar from it. If it is going to shrink, it shrinks here — on a part that cost you no tooling.
  • 你可以剖開、可以照 X 光、可以從本體切試棒。要縮就在這裡縮 —— 縮在一件沒讓你付模具費的件上。
  • Then change the geometry and we pour it again. Changing a printed pattern costs a file, not a die.
  • 然後改幾何、我們再澆一次。改列印白模改的是一個檔案,不是一套鋼模。
02 — Process02 — 製程

Shell lost-foam, from a printed pattern.空殼消失模,白模用 3D 列印。

The pattern is printed, coated in refractory slurry, then burned out of the shell before pouring — so the cavity is empty when the metal arrives. No mould halves, no draft angles, no split lines to design around. 白模列印出來、掛上耐火塗料,在澆注之前就先燒失,所以金屬進去的時候型腔是空的。沒有上下模、沒有拔模斜度、沒有分模線要遷就。

Printed pattern, one piece
Printed pattern, one piece一體列印的白模
Pin-fin array as a pattern — no draft, no split line
Pin-fin array as a pattern — no draft, no split line針鰭陣列白模 — 無拔模、無分模線
As-poured, gating still attached
As-poured, gating still attached澆注後,澆道尚未切除
The same geometry, in aluminium
The same geometry, in aluminium同一個幾何,變成鋁件

Pattern → shell → pour → part.白模 → 掛殼 → 澆注 → 成品。

01

Your file你的檔案

STEP or IGES. We review castability and come back within one working day.STEP 或 IGES。我們做可鑄性評估,一個工作日內回覆。

02

Gating design澆冒口設計

Gate, riser and feed path added to the pattern — the part of this that is twenty years of foundry judgement.在白模上加澆口、冒口與補縮路徑 —— 這一段靠的是二十年的鑄造判斷。

03

Pattern printed列印白模

Printed as one piece. Geometry changes cost a reprint, never a tool.一體列印。改幾何只是重印一支,永遠不動模具。

04

Shell & burnout掛殼與燒失

Refractory coating in layers, dried, then fired until the pattern is gone.耐火塗料逐層塗掛、乾燥,進爐燒到白模完全消失。

05

Pour澆注

A356.2 poured into the hot shell, then quenched and aged to T6.A356.2 澆入熱殼,之後淬火、時效到 T6。

06

Machine & ship加工與出貨

Datum faces, threads and critical dimensions machined. Door to door by courier.基準面、螺紋與關鍵尺寸加工完成。快遞門到門。

03 — Capability03 — 能力範圍
Spiral coolant channel, cast in one piece
Spiral coolant channel, cast in one piece一體鑄出的螺旋冷卻流道
Serpentine channel plate
Serpentine channel plate蛇形流道板
Battery enclosure with integral cooling path
Battery enclosure with integral cooling path內建冷卻流道的電池箱體
Wave fins, as cast
Wave fins, as cast波浪鰭片,鑄態
Thin-wall finned block
Thin-wall finned block薄壁鰭片本體
Backward-curved impeller
Backward-curved impeller後彎葉片葉輪

Why this matters: an internal spiral or serpentine channel cannot be drawn from a die, and cannot be machined in afterwards. A burned-out pattern leaves the cavity empty — so the channel is simply part of the casting.為什麼這件事重要:內部的螺旋或蛇形流道無法脫模,也無法事後加工進去。白模燒失之後型腔是空的 —— 流道就直接是鑄件的一部分。

What we can and cannot pour.我們澆得了什麼、澆不了什麼。

Straight numbers, so you can rule us in or out in thirty seconds.直接給數字,讓你三十秒內判斷要不要問我們。

Parameter項目 Value數值
Alloy合金A356.2 (ZL101A) · T6
Tensile strength, target抗拉強度(目標)≥ 280 MPa
Yield strength, target降伏強度(目標)≥ 210 MPa
Elongation, target延伸率(目標)≥ 8 %
Iron content鐵含量Fe ≤ 0.08 %
Max part envelope最大件尺寸On request依件洽詢
Minimum wall最小壁厚On request依件洽詢
As-cast tolerance鑄態公差On request依件洽詢
As-cast surface鑄態表面粗糙度On request依件洽詢
Process time, first piece製程時間(首件)5–10 days · excludes review, machining and shipping5~10 天 · 不含評估、加工與運送
Tooling charge模具費None. Ever.沒有。一律沒有。
Minimum order最低訂購量One piece一件起
Machining partner合作加工廠

The machining behind the casting.鑄件之後的那一段加工。

A raw casting is only half the part. Our machining partner is an IATF 16949 certified plant running 90 CNC machining centres across 11,000 m², with CMM and material spectrometer in-house and anodizing on the same site — so the part is finished, measured and surface-treated without leaving the supply chain.鑄件只是半成品。我們的合作加工廠通過 IATF 16949,擁有 90 台 CNC 加工中心、11,000 ㎡ 廠房,廠內配置三次元量測儀與材料光譜儀,並具備陽極氧化能力 —— 加工、量測、表面處理不必離開同一條供應鏈。

CNC machining centres × 90
CNC machining centres × 90CNC 加工中心 90 台
Coordinate measuring machine (CMM)
Coordinate measuring machine (CMM)三次元量測儀 CMM
EDM × 6
EDM × 6放電加工機 EDM 6 台
Laser cutting × 2
Laser cutting × 2雷射切割 2 台
Laser 3D printing × 2
Laser 3D printing × 2雷射 3D 列印 2 台
Vision measuring × 2
Vision measuring × 2二次元影像量測 2 台

Why this matters: tooling-free casting removes the mould, not the tolerances. Datums, threads and critical surfaces still have to be machined and measured — and for automotive work the plant doing it has to be IATF 16949 certified. Ours is.為什麼重要:免開模拿掉的是模具,不是公差。基準面、螺紋與關鍵尺寸仍然要加工、要量測 —— 而車用件要求做這一段的工廠必須通過 IATF 16949。我們的合作廠有。

04 — Compared04 — 工法比較

Four routes to a metal part, side by side.金屬鑄造產品生產技術分析。

Where this process sits: no tooling at all. Die casting, gravity casting, sand casting and investment casting all need a mould first — we don't. Lowest up-front investment, a minimum order of one, a process time on par with CNC, producing complex internal cavities and non-demouldable geometry, in the same metal as your production part.免開模快速鑄造的位置:完全不用開模具。壓鑄、重力鑄造、砂模、脫蠟都要先開模具 —— 我們不用。初期投入成本最低、最小訂購量為 1、製程時間與 CNC 同級,做得出複雜中空與無法脫模的幾何,用與量產件相同的金屬材料。

Tooling-Free Rapid Casting免開模快速鑄造法 Conventional casting通用鑄造法 CNC machiningCNC 雕刻法 Metal 3D printing金屬 3D 列印法
Process生產流程1. 3D-print the polymer pattern
2. Coat it in ceramic slurry
3. Fire the pattern out at high heat
4. The same firing forms the shell
5. Pour molten metal into the shell
6. Break the shell off the casting
1. 依照圖面 3D 列印塑料件
2. 將塑料件包裹陶瓷漿料
3. 高溫燒結將塑料液化
4. 高溫燒結同時形成陶瓷殼
5. 將金屬熔液注入空殼中
6. 將陶瓷殼去除取出鑄件
1. Cut the tool from the drawing
2. Set the tool in the machine
3. Apply release agent
4. Cast by pressure or gravity
5. Eject the casting from the tool
※ die, gravity, sand & investment casting all need a mould first
1. 依照圖面製作模具
2. 將模具定位於設備
3. 塗上離型劑
4. 利用壓力或重力鑄造
5. 將鑄件從模具中取出
※ 壓鑄・重力鑄造・砂模・脫蠟,皆須先開模具
1. Buy solid metal stock
2. Fixture the block in the CNC machine
3. Write the full CNC program
4. Remove the finished part
1. 依照圖面購入金屬塊
2. 將金屬塊置於 CNC 設備
3. 編寫完整 CNC 程序加工
4. 加工完成後取下工件
1. Program the print from the file
2. Fuse powder layer by layer
3. Remove the part after sintering
4. Cut off the support structures
1. 依照圖面編程列印程序
2. 設備一層一層燒結粉末
3. 燒結完成後取下工件
4. 將支撐腳去除完成工件
Metals可用金屬Cast aluminium, cast iron, carbon steel, stainless steel, copper alloys鑄鋁、鑄鐵、碳鋼、不鏽鋼、銅Cast aluminium, cast iron, carbon steel, stainless steel, copper alloys鑄鋁、鑄鐵、碳鋼、不鏽鋼、銅Aluminium alloy, steel, stainless steel, copper alloys鋁合金、鋼、不鏽鋼、銅Aluminium alloy, titanium alloy鋁合金、鈦合金
Process time (first piece)製程時間(首件)5–10 days5~10 天120–150 days
90–120 tooling + 30 trial
120~150 天
模具 90~120 + 試模 30
5–10 days5~10 天2–7 days2~7 天
Minimum order最小訂購量111,000+1000 以上1111
Cost per piece單件成本比較Medium中等Lowest最低High次高Highest最高
Up-front investment初期投入成本Lowest最低Highest最高Medium中等High次高
Best suited to適合的產品Complex hollow parts, parts that cannot be drawn from a mould, large castings, low volume / high mix, pre-tooling samples in the production spec, certification and approval samples matching that spec, parts that must be in the same metal as production複雜中空件、無法脫模件、大型鑄件、少量多樣、開模前同規格試樣件、需要與量產件同金屬材料、與量產件同規格之送驗品High volume, mature production批量大、成熟量產件Simple, precise small parts外型簡單且精密小型件Specialist alloys特殊材料件

Process time only. Every column is process time — it excludes castability review, downstream machining and shipping. The delivery date is confirmed per part at quotation.※ 各欄均為製程時間。不含可鑄性評估、後段機加工與運送;實際交期於報價時個案確認。

05 — Fit05 — 適不適合
Swing-arm, thin wall, complex curvature
Swing-arm, thin wall, complex curvature搖臂 — 薄壁、複雜曲面
Cast frame member
Cast frame member一體鑄造車架件
Deep internal ribbing
Deep internal ribbing深內肋結構
Sectioned housing — wall shown
Sectioned housing — wall shown剖半殼體 — 可見壁厚

We would rather turn the job down than take it badly.不適合的案子,我們寧可不接。

Good fit適合

  • You are about to commit to a die-casting or gravity tool and want the geometry proven first.
  • 你正要下訂一套壓鑄模或重力模,想先把幾何驗過。
  • Bridge production — you need parts now, the production tool is still being cut.
  • 過渡量產 —— 現在就要件,但量產模具還在做。
  • Volumes that will never justify a tool: spares, test rigs, special machinery, one-offs.
  • 永遠不值得開模的量:備品、試驗治具、特殊機械、單件。
  • Parts too large for the die-casting machine you have access to.
  • 大件 —— 你找得到的壓鑄機噸位吃不下。

Poor fit不適合

  • Thousands of pieces at a low unit price — go and open a tool, it will be cheaper.
  • 幾千件、要低單價 —— 去開模,那樣便宜得多。
  • Cosmetic parts where every surface must be machined anyway.
  • 每一個面都要加工的外觀件 —— 那就直接 CNC。
  • Anything needing a certified fatigue life from us. We supply data, not a warranty.
  • 要我們背疲勞壽命保證的件。我們提供數據,不提供保證。
  • Steel, stainless or magnesium. Aluminium only.
  • 鋼、不鏽鋼、鎂合金。我們只做鋁。
06 — Where it is poured06 — 在哪裡澆

A working foundry, not a render.是真的在跑的產線,不是算圖。

Fettling and inspection
Fettling and inspection清整與檢查
Automated handling line
Automated handling line自動化搬運線
Machining of datum faces
Machining of datum faces基準面加工
Melting bay, pit furnaces
Melting bay — pit furnaces熔煉區 — 井式熔爐
Robot cell on the moulding line
Robot cell on the moulding line造型線機械手臂
Patterns staged before moulding
Patterns staged before moulding白模上線前備料
Fettling bay with overhead handling
Fettling bay, overhead handling清整區與吊掛線
Vertical machining centre
Vertical machining centre立式加工中心
Machining cells in line
Machining cells in line加工中心機群
ZEISS coordinate measuring machine
ZEISS CMM, temperature-controlled roomZEISS 三次元量測儀(恆溫室)
Industrial X-ray inspection cell
Industrial X-ray inspection cell工業 X 光檢測室
07 — On the line07 — 製程實況

The full shell-mould process, start to finish.殼型鑄造的完整工藝流程。

Ten stages. Stages 03–05 are what make it a shell process: the pattern is liquefied out, then fired into a ceramic shell — so the cavity is completely empty when the metal arrives.十個工序。其中 03~05 是「殼型」的關鍵 —— 白模先液化流出,再高溫焙燒成陶瓷空殼,所以澆鑄時型腔完全是空的。

Shell-mould casting process flow / 殼型鑄造完整工藝流程
Patterns prepared before coating
Patterns prepared and surface-finished白模備妥、表面修整完成
Coated pattern, drying
Coated in refractory slurry, drying掛上耐火塗料,進烘房乾燥
Fired ceramic shell, cavity empty
Fired ceramic shell — the cavity is empty焙燒後的陶瓷空殼 —— 型腔是空的
Shell handled out of the furnace
Shell out of the furnace, ready to mould空殼出爐,準備裝箱
As-cast parts
As-cast parts, gating still attached澆鑄完成的毛坯
As-cast body
A single large as-cast body單件大型鑄件毛坯

Photographs from the production line we work with. The parts shown are steel and stainless castings in the 20–2000 kg range — they illustrate the process, not our own product range.照片攝於合作產線。圖中為 20–2000 kg 級的鋼/不鏽鋼鑄件,用以說明工藝本身,非本公司的產品範圍。

08 — Request a quote08 — 詢價

Send the file. We answer within one working day.把檔案傳過來,一個工作日內回覆。

No account, no sales call. A real engineer reads the file and tells you whether it can be cast, what it costs, and how long it takes.不用註冊、不會有業務電話。由懂鑄造的人親自看檔案,告訴你這件鑄不鑄得出來、多少錢、要多久。

Drop a STEP, IGES or X_T file here把 STEP、IGES 或 X_T 檔拖到這裡 STL tells us the shape but not the tolerances — send a 2D drawing too if any dimension is critical. STL 只看得出形狀、量不了公差 —— 若有關鍵尺寸,請一併附 2D 圖。
This decides whether it is a prototype or a short run — it changes the price most.這一欄決定是打樣還是小批量,對價格影響最大。
Tick this and send nothing yet — we will send our mutual NDA first.勾選後先不用傳檔案,我們會先把雙向保密協議寄給你。
No tooling charge, but the part is not free. You pay for the casting, the machining and the shipping — nothing for a mould, because there is no mould. 沒有模具費,但件本身要收費。你付的是鑄造、加工與運費 —— 模具那一筆沒有,因為根本沒有模具。