Critical Characteristics
Identify datums, fits, bores, sealing surfaces, threads, wall conditions and other features that can affect assembly or function.
01 / Quality Control
Inspection Planned Around the Drawing, Process and Functional Risk.
Quality control starts before production. The inspection scope should reflect what can actually affect fit, function, sealing, strength or repeatability.
TIANHUI MACHINE reviews material, critical dimensions, manufacturing route, secondary operations and required records before deciding where inspection is needed.
02 / Quality Planning
What We Define Before Production Starts.
A useful inspection plan is not a generic checklist. It should be tied to the drawing, process route and agreed acceptance requirements.
Material Requirement
Confirm the specified grade, heat-treatment condition and any chemistry or mechanical-property requirements that need evidence.
Inspection Checkpoints
Place checks before defects or dimensional errors move into expensive downstream machining, finishing or assembly operations.
Documentation Scope
Agree which reports, certificates, first-article records or customer-specific documents are required before production release.
03 / Inspection Workflow
From Requirement Review to Final Release.
Inspection follows the manufacturing route rather than sitting only at the end of it.
Drawing Review
Identify material, tolerances, functional interfaces and special requirements.
Incoming / Material Check
Verify the material or incoming condition according to the project requirement.
In-Process Control
Check selected characteristics during casting, forging, machining or secondary operations.
Final Dimensional Check
Verify finished dimensions and functional features against the released drawing.
Project-Specific Tests
Apply agreed surface, mechanical, NDT or functional checks where the component requires them.
Release & Records
Review the agreed inspection results and documentation before shipment.
04 / Inspection Capability
Different Risks Need Different Verification Methods.
The equipment below reflects the inspection resources used across casting, forging and CNC machining projects. The exact method is selected according to the part and drawing.
Material Analysis
Used to verify alloy chemistry and examine material structure where the project requires it.
- Optical Emission Spectrometer
- Metallographic Microscope / Analyzer
Dimensional Inspection
Used for datums, hole positions, bores, profiles, heights and other drawing-defined characteristics.
- CMM
- Vision Measuring Machine
- Calipers, Micrometers & Gauges
Mechanical Testing
Used where strength or hardness needs to be checked against material or heat-treatment requirements.
- Universal Tensile Testing Machine
- Hardness Tester
Surface & Coating Checks
Used for machined surfaces, coating thickness and corrosion-related verification when specified.
- Surface Roughness Meter
- Coating Thickness Gauge
- Salt Spray Test Equipment
Non-Destructive Testing
Magnetic particle inspection supports surface and near-surface discontinuity detection on suitable ferromagnetic components.
- Magnetic Particle Inspection
- Other NDT methods should be confirmed during RFQ review when specified.
Functional Verification
Used where the finished component requires rotational or torque-related verification beyond dimensional inspection.
- Dynamic Balancing
- Torque Testing
05 / Inspection Equipment
See the Equipment Behind the Inspection Process.
Actual equipment images help buyers verify that inspection capability is more than a list of claims.
06 / Quality Documentation
Define the Records Before the Parts Are Made.
Not every order needs every report. Documentation should match the customer requirement, application risk and agreed inspection scope.
| Document / Record | Typical Use | Availability |
|---|---|---|
| Material Certificate | Confirm specified material or heat information. | When specified |
| Chemical Composition Report | Verify alloy chemistry where required. | Project-specific |
| Dimensional Inspection Report | Record agreed drawing characteristics or critical dimensions. | Available by scope |
| Hardness / Mechanical Test Record | Support heat-treatment or mechanical-property requirements. | When applicable |
| Surface / Roughness Record | Verify specified machined or finished surface requirements. | When applicable |
| Dynamic Balance / Torque Record | Document functional checks for applicable rotating or assembled parts. | When applicable |
| FAI / First Article Record | Support initial sample approval before repeat production. | When agreed |
| PPAP | Support automotive or customer-specific quality planning requirements. | Project-specific |
| COC | Confirm conformity to the agreed order or specification. | When specified |
07 / Sample Approval & Change Control
Quality Has to Continue After the First Good Sample.
For repeat OEM projects, the approved manufacturing route matters just as much as the first inspection report.
First Article Review
Use the agreed sample and inspection scope to confirm the manufacturing route before repeat production.
Change Awareness
Material, tooling, process or drawing changes should be identified before they affect an approved production route.
Repeat Production Control
Maintain the approved process logic and key inspection checkpoints for subsequent production batches.
Nonconformance Review
When a deviation occurs, isolate the issue, identify the affected requirement and define corrective action before release.
08 / Manufacturing-Specific Quality
The Inspection Focus Changes with the Manufacturing Process.
Investment Casting
Focus on casting geometry, surface condition, material verification and machined critical features.
View Capability →Sand Casting
Focus on casting condition, cores, dimensional allowance and finished machined interfaces.
View Capability →Die Casting
Focus on repeatability, porosity risk, trimming, secondary machining and applicable functional requirements.
View Capability →Forging
Focus on material condition, forging geometry, heat treatment and machined interfaces.
View Capability →CNC Machining
Focus on datums, tolerances, bores, threads, surface requirements and final dimensional evidence.
View Capability →
09 / Applications
Quality Priorities Change with the Finished Component.
A pump casing, hydraulic component, agricultural part and automotive component may need very different control points even when made from similar materials.
10 / Buyer FAQ
Quality Control Questions Buyers Often Ask
Yes. The drawing, specifications and agreed quality requirements can be used to define the inspection scope for the project.
Yes. Critical dimensions, holes, threads, bores, mating surfaces and other specified features can be included in the inspection plan.
Yes. If material certification or other material records are required, they should be identified during quotation and technical review.
Yes. Providing the drawing, specifications, critical characteristics and required documentation before quotation helps establish the correct manufacturing and inspection route.
11 / Project Quality Requirements
Discuss Quality Requirements →
Define the Inspection Scope Together with the Manufacturing Route.
Reliable manufacturing requires more than dimensional measurement at the end of production. TIANHUI MACHINE applies quality inspection throughout the manufacturing process, including material verification, dimensional inspection and final checks. Our China factory supports inspection documentation and customer-specific requirements to help OEM buyers maintain consistent component quality.
Send the drawing, material specification, critical characteristics and required reports so the inspection plan can be reviewed before quotation.