Drawing-Based Inspection
Quality Control for Pelletizing Components
JINFENG defines inspection requirements from the component drawing, material requirements, and order specifications. The inspection scope is matched to the product, including pelletizing die plates, pelletizer knives, and cutter hubs.
In-house inspection
- Dimensional inspection
- Hardness testing
- Die-hole inspection
- Surface inspection
- Heating-channel pressure and leak testing
- Hard face and brazed-joint flaw detection
- Material and mechanical testing
When required, ultrasonic testing can be arranged through a qualified third-party inspection provider.
Inspection Based on Drawings and Order Requirements
Customers can identify critical dimensions, required inspection points, and documentation needs during the inquiry stage. Tolerances, test conditions, and acceptance requirements are agreed for the individual order.
The drawing provides the reference for dimensional features, interfaces, working areas, and inspection points. When a sample is used, available dimensional and equipment information helps define the inspection scope.
JINFENG works to an ISO quality management system: technical agreement and drawing confirmation, an in-process control plan, operator self-inspection and specialist inspection, then final product inspection.
Any customer-specific inspection method or documentation requirement should be included with the request for quotation. This allows the applicable work to be defined before the order is finalized.
Raw Material and Mechanical Testing
Die plate forgings are checked on arrival for composition, dimensions, hardness, and internal flaws, and are supplied with mill certificates and tensile and impact test reports.
The JINFENG inspection center is equipped with:
- Grade 00 granite surface plate (9 µm testing accuracy)
- Metallographic microscope
- Impact, tensile, and bending testing machines
- Handheld metal analyzer and infrared carbon-sulfur analyzer
- Benchtop hardness testers
- Surface roughness tester
Dimensional Inspection
JINFENG performs in-house dimensional inspection for relevant pelletizing components. The inspection points are selected from the drawing and may include overall dimensions, mounting features, locating surfaces, and other specified interfaces.
Hardness Testing
JINFENG has in-house equipment for Rockwell C (HRC) hardness testing. The applicable material, working area and hardness requirement are defined for each order.
For pelletizer knives, any published hardness range is tied to the identified working-area material. Customers should include special hardness requirements in the drawing or inquiry.
Die-Hole and Surface Inspection for Die Plates
For die plate projects, in-house inspection capabilities include die-hole inspection and surface inspection. The features to be checked are identified from the die plate drawing and the agreed order requirements.
Internal passages can be checked with an industrial endoscope, and finished die plates can be given geometric tolerance inspection and a hard face temperature-uniformity test.
Surface inspection may also be applied to other pelletizing components when it is relevant to the specified part and working area.
Heating-Channel Pressure Testing
JINFENG performs heating-channel pressure and leak testing for relevant die plate work. The test object and required conditions are defined according to the component and the order requirements.
Customers with a specified test method or acceptance requirement should provide it during the inquiry stage for technical evaluation.
Inspection of Pelletizer Knives and Cutter Hubs
Pelletizer knife inspection may include dimensional inspection, hardness testing, and surface inspection according to the drawing and material requirements.
For cutter hubs, the inspection scope is developed around the hub dimensions, shaft connection, mounting interfaces, and knife-position features shown on the drawing.
Flaw Detection and Third-Party Ultrasonic Testing
JINFENG carries out in-house flaw detection on brazed joints and hard faces, including dye-penetrant checks of the hard face, and issues flaw detection reports.
Where a project requires independent certification, ultrasonic testing (UT) can be arranged through a qualified third-party inspection provider. The required scope should be identified with the inquiry so that third-party involvement can be coordinated with the order.
Information to Specify with Your Inquiry
Please include the inspection information relevant to your component:
- Product drawing and revision
- Critical dimensions or interfaces
- Material and working-area requirements
- Required inspection methods
- Third-party inspection requirements, if any
- Documentation requested with the order
- Customer-specific acceptance requirements
Use the guidance for selecting inspection requirements to prepare the scope before requesting a quotation.
Frequently Asked Questions
Are the same inspections used for every component?
The inspection scope is selected according to the component drawing, material requirements, and order specifications.
Can ultrasonic testing be arranged?
Yes. JINFENG performs in-house flaw detection, and independent UT can be arranged through a qualified third-party inspection provider when required for the project.
When should inspection documentation be requested?
Please identify documentation requirements during the inquiry stage so that the available scope can be defined before quotation.
Define Your Inspection Requirements
Send your drawing and inspection requirements with your quotation request.