Automatic Dispensing Machine Operation Guide: From Basics To Advanced

In the electronics manufacturing and automotive component assembly industries, automatic dispensing machines have become key equipment to improve productivity and precision.

This article summarizes practical experience and provides a comprehensive step-by-step guide to help operators master dispensing machine operation.

I. Pre-Operation Preparation: Safety and Equipment Check

1. Safety precautions

Wear anti-static wrist straps and safety goggles to avoid adhesive splashes.

Verify proper grounding to prevent electric leakage.

Ensure good ventilation, especially when using UV adhesives.

2. Equipment initialization check

Air pressure: Maintain stable between 0.4 – 0.6 MPa.

Adhesive system: Check seal integrity and test for needle clogging.

Motion axis calibration: Use a dial gauge to verify XYZ positioning accuracy.

II. Standard Operation Procedure (8 Steps)

1. Program loading and validation

Import the CAD file and use simulation mode to verify motion paths.

During the first run, set dispense output to 50% to reduce material waste.

2. Core parameter setup

Temperature control: Maintain 35 ± 2 °C for epoxy resins.

Dispensing pressure: Adjust dynamically according to adhesive viscosity (recommend gradient testing).

Z-axis lift height: Should be > 1.5 × dot diameter.

3. Nozzle selection and dispensing pattern

Circular dots: Use a bell-type needle with 0.3 mm orifice.

Line coating: Use a flat-mouth nozzle with a 30° inclination.

3D encapsulation: Employ a 5-axis model with a rotary axis.

III. Common Troubleshooting Guide

1. Stringing issue

Increase back-suction time to 0.2–0.5 s.

Verify adhesive viscosity within equipment range.

Reduce nozzle-to-substrate gap to 0.5–1.2 mm.

2. Inconsistent dispensing volume

Clean pressure-tank filter at least twice per month.

Check needle valve O-ring wear (typical lifespan ≈ 80 000 cycles).

Re-calibrate pressure sensor (error < ± 1.5 %).

3. Path deviation correction

Use laser alignment to compensate thermal expansion drift.

Replace X-axis guide blocks every 6 months.

Add a 0.5 mm retraction offset command at program end.

IV. Advanced Optimization Strategies

1. Big Data integration

Record adhesive consumption curves via MES systems.

Build regression models correlating dot diameter with pressure parameters.

2. Energy management

Replace stepper motors with servo motors (approx. 30% power saving).

Enable automatic pressure-down standby during idle periods.

3. Smart maintenance system

Install vibration sensors to monitor abnormal screw wear.

Implement PLC-based predictive maintenance alerts.