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    Metal Parts Visual Quality Standards

    Writer: KangDing hardware Pubdate:2017-07-13 Source:CNC Machining Factory
    Description:Metal parts Visual Quality Standards Painting, Powder Coating, Plating, CNC Machining , Metal Stamping, Fixture and Fastener Bolt Purpose This visual quality standard (VQS) has been developed by Kang Ding to create an objective methodology...

    Metal parts Visual Quality Standards

    Metal Surface Treatment, Powder Coating, Plating, CNC Machining , Metal Stamping, Fixture and Fastener Bolt
     
    Purpose
    This visual quality standard (VQS) has been developed by Kang Ding to create an objective methodology for inspecting finished parts and controlling the consistency of the cosmetic appearance.

    Scope
    The scope of this standard covers surfaces that have been Metal Surface Treatment, powder coated, plated, metal stamping, fixture, fastener bolt machined or received some other secondary finishing process. This scope is generally defined by our current production abilities. If the client doesn’t have a VQS standard, then we will reference this standard. If the client has a VQS, and it’s equal to or below our standard, then we will use that standard as the reference. If the client’s VQS is more demanding than our standard, then we need to communicate with the client to reach an acceptable compromise for both parties.

    Conditions For Visual Inspection
    Viewing Distance: 300mm +/-50mm
    Viewing Time : 30s +/-10s (depending on part size and geometry)
    ISO10526 : 1999-E (D65 Lighting Standard Illumination) : 1000(LUX) +/-200
    ISO 3058: 1974 Non - destructive testing - Visual inspection of auxiliary - low magnifier selection
    ISO 3058: 1976 vernier caliper readings to 0.1 and 0.05 mm
    Implementation of ISO standards, the United States ASME standards

    VQS Classification
    Metal Parts Product Size Classification
    The purpose of classifying metal parts product size is to define the number of defects that are permissible in a given surface area.
    1. S: 1-100mm2
    2. M: 100-200mm2
    3. L: 200-300mm2
    4. XL: >300mm2
    Specific requirements can see the standard JB / T5058-2006

    Example of Visual Classifications
    Preferably, the customer is to provide Star with a 2D isometric drawing with visual surface classifications clearly stated on the drawing. These classifications will be used to define the VQS which is to be applied to the part.

    Class I - Direct Visual Surface
    A direct visual surface means that this is the surface most easily seen and judged by the client.
    This surface will receive the most critical attention and therefore defects on this surface are to be kept at a minimum. If it’s a transparent part, then all the surfaces will be deemed class I.
    Product surface defect detection is a kind of machine vision technology, is the use of computer vision simulation of human visual function, from the specific physical image acquisition and processing, calculation, and ultimately the actual detection, control and application.

    Class II - Indirect Visual Surface
    This is a surface that the customer will be able to see, but is not necessarily in their direct view. For example, if we were to machine a cube, the left and right side of the cube would be considered indirect visual surfaces if the normal view is the front face of the cube. Depending on the geometry of the part, Kang Ding reserves the right to determine which surface(s) will be considered indirect.
    Kang Ding uses machine vision technology to improve user productivity, making the production more meticulous, more clear division of labor, at the same time, reducing the company's labor costs, saving the financial resources, to achieve the integration of intelligent machine development.

    Class III - Non-Visual Surface
    As the classification implies, this surface has no particular visual requirements. As a general rule, non-visual surfaces should not contain any types of defects related to poor handling, assembly and functioning such as scratches and fingerprints unless permitted due to the constraints of a particular working process. Normally not visible or only visible during installation. If the part is an internal metal part, then all the surfaces will be deemed class III.

    Inspection Method
    The reason for this section is to minimize subjectivity as much as possible. In cases where certain defects are questionable or at the highest limit of our defect specification, we use this method to arrive at an objective decision. Visual surface defects must be viewed from more than one angle. All defects will be measured according to the following class tolerance.Will use the Kang Ding defect ruler to measure defects. The distance between two defects shall be no less than 0.1 mm.
     
    Will use the Kang Ding defect ruler to measure defects. The distance between two defects shall be no less than 0.25 mm.
     
    The sizes and allowable occurence for dimensional defects. For any issues with more than two defects, the distance between two defects must be no less than 25 mm.
    - Small: 0-100mm
    - Medium: 100-200mm
    - Large: 200-300mm
    - XL: >300mm

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