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Four Values We Hold, and How Each One Is Verified

Not a tour of the plant — the tolerances that arrive with the goods, and the check behind each one: vacuum heat treatment, straightening, grinding, then a dimensional report.

Vacuum heat treatment furnace and process curve
01

Vacuum Heat Treatment

Vacuum Gas Quench · Zero Oxidation

Quenching is performed in a vacuum furnace under a low-pressure nitrogen atmosphere, eliminating surface oxidation and decarburization. Compared with traditional salt-bath or atmosphere furnaces, vacuum heat treatment delivers consistent core-to-surface hardness and significantly longer cutting-edge life.

Quench MediumHigh-purity N₂
Vacuum Level≤ 0.1 Pa
Quench Temp.1020–1040°C
Hardness Tolerance≤ ±1 HRC
Decarburization≤ 0.05mm
DistortionMinimal
  • Zero oxidation or decarburization — bright, clean surfaces
  • Hardness uniformity within ±1 HRC along the full bar
  • Minimal distortion reduces grinding stock removal
  • Full furnace batch record issued with every shipment
Precision straightening press in operation
02

Precision Straightening

Dial-Indicator Verified · Inspected Bar by Bar

Heat treatment introduces slight distortion. Every bar is straightened on a precision press and checked in real time with dial indicators, ensuring the straightness and runout required for high-precision die finishing.

Straightness≤ 0.05 mm / 300 mm
On request≤ 0.02 mm / 300 mm
Runout (TIR)≤ 0.005mm
MethodMechanical press straightening
InspectionDial indicator + V-block
Frequency100% bar-by-bar check
Grinding Stock0.15–0.25mm per side
  • Straightness ≤ 0.05 mm / 300 mm — no runout on the grinder
  • Every bar inspected before warehousing
  • Generous grinding stock for your finishing operations
  • Stress-relief tempering after straightening removes residual stress
CNC cylindrical grinding of a hardened steel bar
03

Precision Grinding

CNC Cylindrical Grinding · Ra 0.6 - 0.2 µm

After heat treatment, bars are finish-ground on CNC cylindrical grinders to achieve tight diameter tolerances and a fine surface finish. Ground bars go straight onto your machine — no in-house prep needed.

Diameter Toleranceh7 / on request
Surface FinishRa 0.6 - 0.2 µm
On requestRa ≤ 0.1 µm
Roundness≤ 0.005mm
Cylindricity≤ 0.01mm
Size RangeΦ2 - Φ100 mm
Stock Lengths200 / 300 / 500 / 1000 mm
DeliveryGround straight bars
  • Precision-ground surface ready for direct production
  • Consistent diameter tolerance along the full length
  • Fine surface finish reduces tool friction and wear
  • Full dimensional inspection report with each batch
CNC machining center cutting rotary die profiles
04

CNC Machining

Custom Profiles · Made to Drawing

For rotary dies, CNC machining centers mill custom tooth profiles — straight, helical, angled or wave — directly from your 2D drawing or 3D model, followed by dynamic balancing for high-speed operation.

ProfilesStraight / helical / custom
Balance Grade≤ G6.3
Files Accepteddwg / pdf / stp / step
MaterialsM2 / M35 / M42 / ASP23
AccuracyProfile within ±0.01mm
Lead Time7–15 business days
  • Tooth profiles fully customized to your application
  • Dynamic balancing for smooth high-speed rotation
  • Feasibility review by our engineers before production
  • Mill test certificate and inspection report issued with the goods

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