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Hot Distortion Tester VHD I

Hot Distortion Tester VHD I

 

  • 1.1 General information

    Hot Distortion Tester is equipped with a gas burner mechanism, specimen clamping mechanism and sensing mechanism which are controlled by PLC and observed on screen touch HMI. By default it can measure distortion of a 1/4”x1”x4”) standard transverse specimen.

  • 1.2 General Usage

    Take the standard transverse specimen (1/4”X1”X4”). Lift sensor probe up side by figure & slide the specimen in specimen clamping area and clamp it. Release the sensor probe on specimen. Press the start key, equipment shows displacement against time span.

  • 1.3 Product Data

    Product Name:

    Hot Distortion Tester

    Product Code:

    VHD I

    Order Reference Code:

    V0000116

    Electrical Supply Required:

    230v 50Hz A.C. (Default)

    110v 60 Hz A.C (Optional)

    Single Phase, Stabilized with Over/ Under Voltage cut-off.

    Electrical Plug:

    M type : 15 Amp Plug

    Typical Maximum Current:

    1.2 A at 230V

    Compressed air Supply:

    Not Required

    Communication:
    • Ethernet (RJ45)
    • CloudSync using V-Sync

    Dimensions:

    685x390x360 mm (WxBxH)

    Packing Dimensions:

    790x500x460 mm (WXBXH) Typical

    Net Weight:

    Approximately 40 kg

    Gross Weight:

    Approximately 50 kg

    Colour:

    Factory Default

    Measuring Range:

    Distortion: ±7mm

    Traceable to:

    NABL Standards

    Least Count:

    Distortion: 0.01 mm

    Specimen Requirements:

    Required

    Operating Temperature:

    0-500C

    Testing Standards:

    BIS/AFS

    Calibration Frequency:

    22500 nos. of Testing Cycles or Once in Year

  • 2.1 Scope of supply

    • Hot Distortion Tester.
    • Standard calibration plate.
    • Calibration certificate.
    • Instruction manual.

  • 3.1 Recommended pre-requisite equipment

    Sand Splitter : To get representative sample

    Specimen preparation equipment’s to make a standard specimen.

  • 4.1 Recommended Calibration kits

    Standard slip gauge: 7mm

  • 4.2 Recommended attachments

    NA

  • 4.3 Alternative equipment

    Hot Distortion Tester VHD

  • Importance of the test

    The Importance and Use of Hot Distortion Testing in Foundry Sands

    In modern metal casting, achieving consistent quality and reducing rejections is a top priority. One often-overlooked but critical contributor to casting defects is thermal distortion in mould and core materials. The Hot Distortion Test plays a vital role in diagnosing and preventing such defects by evaluating how foundry sand systems behave when subjected to high temperatures.

     Why Hot Distortion Testing Matters

    Chemically bonded moulds and cores, especially those exposed directly to molten metal, undergo extreme thermal stress during casting. If the sand system lacks thermal stability, the binder or sand matrix can distort, leading to a cascade of defects such as:

    • Veining and Expansion Cracks: Resulting from uneven or excessive expansion.

    • Metal Penetration: Caused by loss of sand strength and surface integrity.

    • Scabbing and Buckling: Due to non-uniform distortion and binder degradation.

    Hot distortion testing simulates these conditions under controlled parameters, providing foundries with quantitative data on how their sand formulations will perform in actual casting environments.

     How the Test Works

    A standard sand specimen is subjected to a direct flame in the Hot Distortion Tester (VHD I). As the specimen heats, a non-contact sensor records its deformation over time, producing a distortion curve. The test concludes when the specimen fails due to thermal stress.

    Key outcomes of the test include:

    • Maximum distortion value (mm)

    • Time to failure (s)

    • Distortion curve shape, indicating binder resilience and structural integrity

    These insights enable foundries to:

    • Compare different sand-binder systems

    • Optimize binder levels and curing parameters

    • Qualify new suppliers or raw materials

    • Monitor production batch-to-batch consistency

     Applications Across Foundry Operations

    Application Area Role of Hot Distortion Test
    R&D & QA Benchmark new sand formulations or resin systems
    Process Optimization Tune additive and binder levels for better thermal resistance
    Supplier Evaluation Validate sand quality before large-scale procurement
    Defect Diagnosis Correlate distortion behavior with observed casting defects

    🏭 Real-World Value in Foundries

    Foundries that integrate hot distortion testing into their quality control framework benefit from:

    • Lower scrap and rework rates

    • Improved casting dimensional accuracy

    • Enhanced confidence in new tooling or mould design

    • Faster troubleshooting and root cause analysis

    By identifying how sands behave under heat before actual casting, foundries can make proactive adjustments—saving time, money, and resources.

    VHD I: Designed for Precision and Simplicity

    The Versatile Hot Distortion Tester (Model: VHD I) offers unmatched ease of use, accuracy, and digital traceability. Its touchscreen interface, automated flame control, and Industry 4.0 connectivity make it ideal for both production and R&D environments.

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