Changchun Intelligent ZKY-I Notching Machine for Impact Testing Specimens

Overview

The Changchun Intelligent ZKY-I Notching Machine is a precision-engineered benchtop instrument designed exclusively for the reproducible preparation of standardized notches in polymeric specimens prior to impact testing. It operates on a mechanically actuated, manually controlled feed system with calibrated micrometer adjustment, ensuring consistent notch depth across sequential samples. The machine conforms to the geometric requirements specified in ISO 179-1 (Charpy), ISO 180 (Izod), and GB/T 1843–1996 for both unnotched and notched bar impact testing. Its primary function is to produce V-shaped notches with rigorously controlled angular geometry and root radius—critical parameters that directly influence fracture initiation behavior and energy absorption measurements in standardized impact protocols.

Key Features

• High-precision micrometer feed mechanism with 0.01 mm resolution enables repeatable notch depth control—essential for inter-laboratory comparability and compliance with ASTM D6110 and ISO 179 validation criteria.
• Dual-standard notch tooling included: two interchangeable cutting tools—one configured for a 45° ± 1° notch angle with a root radius of r = 0.25 ± 0.05 mm (for thin-section or high-sensitivity materials), and another with r = 1.0 ± 0.05 mm (aligned with standard Charpy specimen requirements per ISO 148-1).
• Sturdy cast-iron base and rigid worktable (140 × 145 mm) provide dimensional stability during machining, minimizing vibration-induced deviations and ensuring perpendicularity between notch plane and specimen surface.
• Manually operated handwheel drive allows fine vertical positioning of the specimen relative to the stationary cutter; clockwise rotation raises the table, counterclockwise lowers it—enabling precise alignment before feed engagement.
• Zero-reference calibration protocol: Micrometer dial is set to 5 mm at initial contact point, establishing a repeatable datum for depth-of-cut programming without reliance on external measurement tools.

Sample Compatibility & Compliance

The ZKY-I accommodates rectangular plastic bars up to 140 mm in length and 145 mm in width, with typical thicknesses ranging from 3 mm to 15 mm—covering common specimen dimensions used in ISO 179 (Charpy) and ISO 180 (Izod) test configurations. It supports thermoplastics (e.g., ABS, PC, PP, PA), thermosets (e.g., epoxy, phenolic), and filled composites. All notch geometries comply with ISO/IEC 17025 documentation requirements when operated within defined procedural controls. The machine itself does not require CE marking as it functions solely as a specimen preparation device—not a safety-critical testing apparatus—but its output is routinely accepted in GLP-compliant laboratories performing polymer mechanical property certification per ASTM D256 and ISO 180 audit trails.

Software & Data Management

The ZKY-I is a fully manual, non-digital instrument with no embedded firmware, touchscreen interface, or data logging capability. This design prioritizes operational simplicity, long-term mechanical reliability, and traceability through documented procedural adherence rather than electronic record generation. Operators are expected to maintain a written logbook recording date, operator ID, material batch number, notch depth setting (micrometer reading), tool type used (r = 0.25 mm or r = 1.0 mm), and visual inspection confirmation of notch symmetry and edge continuity. Such records satisfy minimum documentation expectations under ISO/IEC 17025 clause 7.5.2 and support internal quality audits where digital systems are not mandated.

Applications

• Preparation of notched specimens for Izod and Charpy impact testing in QC labs serving automotive, packaging, and construction polymer suppliers.
• Standardized notch fabrication for research-grade fracture mechanics studies involving crack-tip stress intensity factor (K_Ic) correlation in brittle thermoplastics.
• Calibration verification of impact tester energy scales using reference materials with known notch sensitivity profiles.
• Supporting ASTM D790 flexural testing when notched beam configurations are required to evaluate localized strain response.
• Enabling comparative evaluation of notch sensitivity across polymer grades—particularly relevant for evaluating the effect of UV stabilizers, flame retardants, or impact modifiers on fracture propagation resistance.

FAQ

What standards does the ZKY-I comply with for notch geometry?
It produces notches conforming to ISO 179-1 (Charpy), ISO 180 (Izod), and GB/T 1843–1996, including strict control of 45° ± 1° notch angle and root radii of either r = 0.25 ± 0.05 mm or r = 1.0 ± 0.05 mm.
Is the machine compatible with automated test systems?
No—it is a standalone manual preparation tool. Integration with automated impact testers requires external specimen handling and positioning workflows.
How is traceability ensured without digital output?
Through operator-maintained logbooks documenting micrometer settings, tool identification, material lot numbers, and visual inspection outcomes—fully aligned with ISO/IEC 17025 documentation practices.
Can the ZKY-I be used for metals or ceramics?
It is engineered and validated exclusively for polymeric materials; use with metals or ceramics may damage the carbide-tipped cutting tools and compromise geometric fidelity.
What maintenance is required?
Regular cleaning of the worktable and guide rails, periodic lubrication of the micrometer screw and handwheel bushings, and annual verification of micrometer calibration against NIST-traceable gauge blocks.