Quality Assurance

Pre-production technical support

In early stage of cooperation, we’ll provide customers free assessments of projects and improving suggestion(DFM), such as materials, surface requirements, product and tool structures, process technologies, 3D & 2D drawings, and other details, and also assist customers to modify product designing.

Set project control plan：After confirm the finalized drawings and requirements of products, our project engineering team will set production plans according to the overall requirements of projects, including production operation standard, quality inspection standard(material inspection, dimension inspection, appearance inspection, performance testing…etc.) and packing standard, etc.

In Production

Authentic Materials：For all materials, we can provide certifications of material and heat treatment from raw material manufacturers, usually including material heat numbers, material trademarks, material size, mechanical property, chemical analysis, hardness, etc.

In-process quality control：For every project, our professional project engineers are responsible for project schedule, providing customer project schedule and photos every week, and also are responsible for quality together with QC and production departments.

GREFEE will set production and quality standards for every product based on ISO9001:2015, including FAI(first article inspection), IPQC(InPut Process Quality Control), AQL(acceptable quantity limit) and full inspection.

Pre-shipment Inspection

In GREFEE’s quality control system, QC engineers are involved in every step, and data are recorded for tracing in the future. For all projects, we provide customer QC reports for all inspection items, including part quantity, critical dimensions, threads & tolerances, thickness & depth, part appearance, and material property, to ensure all parts 100% qualified delivery.

Packing：To ensure the custom made parts not damaged in logistics process, we provide 5 layers of protection in packing process: 1. Steel components are sprayed with anti-rust painting. 2. Wrapping paper. 3. Pearl cotton. 4. Foam. 5. Packed in boxes or wooden cases. We’d like to make sure that our customers received the most high quality and beautiful parts.

The three dimensional (CMM)：

CMM is a measurement method of geometric elements, including point, line, surface, circle, sphere, cylinder, cone, etc. Based on coordinates of three-dimensional space, CMM can continually scan the part with complicated precise dimension, shape and tolerance, and the surface of high-precision geometric, and also mechanical parts with complicated shapes, and then achieve part inspection, shape measuring, and process control. CMM is widely used in industries of precision accessories, precision mould, precision manufacturing, military, aerospace and automobile making.

Spectrum analyzer：Spectrum analyzer can detect raw material ingredient in raw material feeding, it can quickly test the ingredient and element proportion of raw material, and its accuracy can meet laboratory requirements. It can identify the reality of material fast.

X ray：Mainly used for inspecting the air holes inside die casted parts.

2D image measuring：2D image measuring is based on CCD digital image, relying on computer screen measurement technology and powerful software ability of space geometry , It can read the displacement value of the optical ruler quickly, for the operator to make image contrast and measure, then quickly and intuitively distinguish the possible deviation of the measurement results. Generally it is used in simple hardware components and prototype model.

Roughness Tester：We use roughness tester to check the roughness of the part surface, to confirm whether the surface roughness is qualified, which avoid errors by artificial judgments.

Spectral photometric color measuring：Spectral photometric color measuring can simulate color difference under multiple lights.

Other inspection equipments：Besides, GREFEE has height gauge, hardness tester, all kinds of internal and external thread, micrometer, caliper, etc., All these inspection equipments are used for quality control testing, to make sure the product quality meet demands as customer required.