We are an ISO/TS 16949 certified company showing our determination and insistence on quality and continuous progression.
Our QC dept. takes charge of the production quality. We check every step of the processes such as the inspection of forging material, daily process inspection, and final product inspection. Besides, the MSA and SPC analysis also show that our process stability and measurement system are reliable. We have faith to deliver excellent products to our customers.
Main Inspection InstrumentsOpen or Close
Measurement Scope Tolerance Instrument Capability Bore Diameter ±0.005mm Bore Gauge (Sunnen) 0.001mm Bore to Bore Distance ±0.05mm Micro-Hite Gauge (TESA) 0.001mm Rod Thickness ±0.05mm Micrometer (Mitutoyo) 0.001mm Hardness HRC 25~45
Hardness Testing Machine (Mitutoyo) 1 HRC Roundness / Cylindricity 0.003mm Round Tester (Mitutoyo) 0.01μm Roughness Under Ra 0.2μm Roughness Meter (Mitutoyo) 0.01μm Parallelism 0.05/100 Indicator (Mitutoyo) 0.01mm Ring Gauge Correction ±1μm Universal Length Measuring Instrument (Helios) 0.1μm Rod Profile ±0.30mm Video Measuring System (ARCS) 0.5μmBore GaugeMicro-Hite GaugeHardness Testing MachineMicrometerRound TesterRoughness MeterParallelism MeasurementRing Gauge CorrectionVideo Measuring System
Measurement Systems Analysis (MSA)Open or Close
Following shows the MSA analysis of our bore gauge. Results show that all the MSA requirements including stability, bias, linearity, repeatability, and reproducibility are qualified. Of course, other measurement systems are also qualified to ensure our measurements are reliable.StabilityBiasLinearityRepeatability: %E.V. = 8.77%
Reproducibility: %A.V. = 4.92%
Gage R&R: %GR&R = 10.06%
Statistical Process Control (SPC)Open or Close
Following shows our SPC results of big-end bore diameter. The Cpk of big-end bore diameter is 2.57 (which should be larger than 1.33) showing our excellent process control on the con-rods production.Big-end Bore Diameter (51 pieces):X-R Control ChartSpecification LimitControl LimitAverageResults:
Cpk=2.57 (>1.33)Measurement Distribution
Weight Measurement: All Machined Surface TypeOpen or Close
We developed all machined surface type rods to precisely control the weight of rods. Excellent weight control can assure excellent dynamic performance at high RPM.
Weight Amount 472-474g 12 474-476g 85 476-478g 102 478-480g 21 Total 220
Fracturing-Splitting TechniqueOpen or Close
Our fracturing-splitting technique have been developed for more than ten years. The irregular cutting surface results in an excellent assembling repeatability. Following Chart shows the reassembling result of our product. Results show that the bore diameter and roundness is almost the same after reassembling.Test Model: 688 (Yamaha 85HP)
No. Bore Diameter
1 39.023 0.002 39.025 0.002 2 39.023 0.002 39.024 0.002 3 39.025 0.002 39.026 0.002 4 39.023 0.002 39.024 0.002 5 39.025 0.002 39.027 0.003 6 39.022 0.002 39.024 0.002 7 39.022 0.002 39.023 0.002 8 39.021 0.003 39.023 0.003 9 39.024 0.002 39.024 0.003 10 39.023 0.002 39.024 0.003