Technical Support

Committed to helping customers solve every technical problem from sample preparation to result analysis

Service Commitment

Response time

Response within 2 hours for technical inquiries

Remote support

7×24 online remote assistance

On-site service

On-site engineer within 48 hours (if needed)

Spare parts supply

Common spare parts shipped within 3 working days

Training services

Free operation training after purchase

Service Process

Technical Resource Center

Hardness Testing Guides

Hardness testing is essential for evaluating mechanical properties. OCHI provides standard operating guides for various hardness testing methods, helping you correctly select test methods, set parameters, and obtain accurate, reliable results.

Available Downloads:

Metallographic Preparation Guides

Based on years of practical experience, OCHI’s technical team has compiled detailed preparation guides covering cutting, mounting, grinding, polishing, and etching for common materials. Whether you’re working with steel, non-ferrous metals, ceramics, or composites, you’ll find suitable preparation solutions.

Frequently Asked Questions (FAQ)

1.General Questions

How to choose the right cutting wheel?

Based on material hardness and type:

Non-ferrous metals (HV<375) → LWA series resin wheels

Ferrous metals (HV375-600) → HWA series resin wheels

Ferrous metals (HV>600) → HSA series resin wheels

Hard brittle/precision materials → Diamond blades

Possible causes and solutions:

High resin shrinkage → Use CHM3 edge-retention resin

Insufficient pressure → Increase mounting pressure

Too rapid cooling → Extend cooling time or reduce water flow

Sample not clean → Ensure sample is dry and clean

Check the following:

Skipped a grit step (e.g., P400 to P1200 directly)

Polishing cloth dirty or worn

Polishing suspension grit appropriat

Sample cleaned properly (residue from previous step)

Possible causes:

Sample surface not flat or improperly placed

Indenter damaged or contaminated

Dwell time incorrect

Calibration needed

Contact us via:

Tel: +86 13681677141 / +86 18921375901

Email: jin@ochitest.com

Online form: Submit description and model
We’ll respond within 2 hours.

2. Equipment Category FAQs

Ensure adequate coolant circulation, check coolant ratio (1:20 recommended), reduce cutting speed or use pulse mode.

Possible causes: Cutting speed too fast, insufficient cooling, wrong wheel type, excessive feed pressure.
Possible causes: High shrinkage, insufficient pressure, too rapid cooling, oily sample. Use edge-retention resin (CHM3), increase pressure, control cooling rate.
Check vacuum reaches -0.1Mpa, extend vacuum time, use low-viscosity resin (e.g., OCM4), ensure immediate vacuum after mixing.
General reference: Rough grinding (P240, 20-30N, 300rpm, 2-3min); Fine grinding (P600-P1200, 15-20N, 300rpm, 2min); Polishing (3μm diamond, 10-15N, 150rpm, 3min; final 0.05μm silica, 10N, 150rpm, 2min). Adjust based on material.
Due to hardness differences. Reduce pressure, shorten polishing time, or use finer suspension.
Start from surface edge, indent perpendicular to surface with 0.05-0.1mm steps until hardness drops to core+50HV. Use automatic tester (e.g., 402MVMS) for auto indentation and curve plotting.
General: HRC for hardened steel, carbides (20-70HRC); HRB for soft steel, copper (60-100HRB); HRA for carbides, thin cases (>70HRA); HR15N for thin surface layers.

Service Network

OCHI has headquarters service center in China and authorized service partners in Europe and Southeast Asia, providing localized technical support.

Customer Reviews

What Our Clients Say

Residential Construction
An aerospace research institute:OUCHI sample preparation equipment offers extremely high precision with zero damage to samples, perfectly meeting our needs for microanalysis of high-temperature alloys.
Commercial Project
An automotive parts manufacturer:The etching device features precise temperature control and complete safety protection, greatly improving the efficiency of our component quality inspection.
Renovation
A university materials laboratory:Consumables are of stable quality and supporting services are comprehensive. From sandpaper to polishing fluid, everything is available, greatly facilitating daily scientific research.

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