Quality is the survival baseline for Hualing Machinery. Fifteen years of phenolic resin parts production experience has taught me: if quality control is not done well, all previous efforts are wasted. This article systematically explains the three core dimensions of quality control for phenolic resin parts.
Dimension One: Appearance Inspection
Appearance is the most intuitive quality signal. Common appearance defects in phenolic resin parts:
Dimension Two: Dimensional Inspection
The dimensional accuracy of phenolic resin parts is determined by both mold and process. Key inspection points:
Not all dimensions require 100% inspection. Identify critical functional dimensions (such as bore diameters, threads, keyways) and perform 100% full inspection on these; general dimensions are inspected according to AQL sampling.
Common measuring tools: Vernier caliper (accuracy 0.02mm), micrometer (accuracy 0.001mm), thread plug/ring gauges, CMM measurement (first 3 pieces of batch).
Dimension Three: Functional Inspection
Appearance and dimensional compliance does not mean there are no functional issues. Functional testing should be designed based on actual usage scenarios:
- Handwheels / Handles: Smooth rotation without jamming; handle strength test (apply rated torque)
- Valve Plates / Seats: Sealing surface flatness detection; pressure test (1.5x rated pressure)
- Electrical Insulation Parts: Voltage withstand test (2x rated voltage), insulation resistance measurement
- Insert-molded Products: Insert-to-resin bonding strength test (pull-out force test)
Establishing a Quality Control System
Based on our factory's 15 years of experience, we recommend establishing the following three-tier inspection system:
AQL Reference Standards
Welcome to visit our factory or request our quality inspection report template.
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