🏗️ Rebar Threading Machine: Complete Operation Guide & Troubleshooting Manual
📋 Table of Contents
Equipment Overview
Pre-Operation Preparation
Standard Operating Procedures
Quality Inspection
Troubleshooting Guide
Daily Maintenance
Safety Precautions
🔧 Equipment Overview
The Rebar Threading Machine (also known as Rib Peeling Rolling Machine) is essential construction equipment used to process parallel thread connections on rebar ends. Through cold rolling technology, the machine creates cold-hardened threads that significantly improve connection strength and reliability.
| Technical Parameters | Specifications |
|---|
| Processing Range | Φ16mm - Φ40mm |
| Motor Power | 3-4 kW |
| Voltage | 380V / 50Hz (Three-phase) |
| Spindle Speed | 40-80 rpm |
| Thread Angle | 60°-75° |
| Processing Efficiency | 300-500 joints/shift |
⚙️ Pre-Operation Preparation
✅ Equipment Inspection Checklist
| Check Item | Standard | Status |
|---|
| Power Supply | 380V ±10%, stable three-phase | ☐ |
| Grounding | Reliable grounding connection | ☐ |
| Blade Wear | Peeling blade < 0.5mm wear | ☐ |
| Rolling Wheel | No cracks or excessive wear | ☐ |
| Cooling System | Water-soluble cutting fluid filled | ☐ |
| No-load Test | Run 3-5 minutes, no abnormal noise | ☐ |
📐 Rebar Preparation Requirements
⚠️ CRITICAL: Rebar ends must be cut with a cut-off saw (NOT gas cutting or rebar cutter) to ensure:
End face flatness deviation ≤ 4°
No burrs or irregularities
500mm length from end must be straight (no bending)
🔩 Tool Adjustment Procedures
Step 1: Rolling Wheel Adjustment
Insert the thin end of the gauge rod into the rolling wheel
Adjust the worm gear to lightly clamp the gauge rod
Remove gauge rod and tighten locking screws
Step 2: Peeling Blade Adjustment
Place the thick end of gauge rod at the center of peeling blade holder
Loosen positioning disc screws
Rotate positioning disc until blades lightly clamp the gauge rod
Lock the screws firmly
🔄 Standard Operating Procedures
🔵 Normal Thread (Clockwise) Operation
┌─────────────────────────────────────────────────────────┐
│ STEP 1: POWER ON │
│ • Connect power supply │
│ • Open cooling water valve │
│ • Set switch to "NORMAL" position │
│ • Press FORWARD button │
├─────────────────────────────────────────────────────────┤
│ STEP 2: RIB PEELING │
│ • Insert rebar into clamping device │
│ • Rotate feed handle toward workpiece │
│ • Blades automatically open when peeling completes │
├─────────────────────────────────────────────────────────┤
│ STEP 3: THREAD ROLLING │
│ • Continue feeding until rolling wheel contacts rebar │
│ • Apply uniform pressure │
│ • Machine auto-feeds one pitch per revolution │
├─────────────────────────────────────────────────────────┤
│ STEP 4: AUTO RETRACTION │
│ • Machine stops automatically when complete │
│ • Reverse rotation begins for tool retraction │
│ • Rotate feed handle clockwise to return home │
│ • Remove finished workpiece │
└─────────────────────────────────────────────────────────┘
🔴 Reverse Thread (Counter-clockwise) Operation
| Step | Action | Button/Switch |
|---|
| 1 | Set to "REVERSE" position | Switch |
| 2 | Start peeling process | FORWARD |
| 3 | Stop peeling | STOP |
| 4 | Begin thread rolling | REVERSE |
| 5 | Complete and retract | FORWARD |
✓ Quality Inspection Standards
📏 Dimensional Checks
| Inspection Item | Tool | Acceptance Criteria |
|---|
| Thread Length | Ring gauge | Within tolerance (±1mm) |
| Thread Fit | Go/No-go gauge | Go gauge: full engagement
No-go gauge: ≤3 threads |
| Surface Finish | Visual inspection | No cracks, missing threads
Ra ≤ 6.3μm |
🛠️ Troubleshooting Guide
❌ Problem 1: Machine Won't Start
| Symptom | Probable Cause | Solution |
|---|
| No power | Phase missing or voltage low | Check 380V three-phase supply |
| No response | Blown fuse or breaker trip | Replace transformer fuses |
| No response | Loose wiring connections | Tighten control circuit terminals |
| No response | Faulty limit switches | Check front/rear limit switch contacts |
❌ Problem 2: Thread Formation Failure / Irregular Threads
┌────────────────────────────────────────┐
│ DIAGNOSTIC FLOWCHART │
├────────────────────────────────────────┤
│ ► Check rotation direction │
│ └─→ Wrong? → Adjust switch setting │
│ │
│ ► Verify rolling head specification │
│ └─→ Mismatch? → Install correct head│
│ │
│ ► Inspect positioning sleeve order │
│ └─→ Incorrect? → Reassemble properly│
│ │
│ ► Examine rolling wheels for damage │
│ └─→ Damaged? → Replace components │
└────────────────────────────────────────┘
❌ Problem 3: No Auto-Retraction (Tool Won't Return)
| Checkpoint | Inspection Method | Action |
|---|
| Rear limit switch | Check if closed contact is open | Adjust or replace switch |
| Front limit switch | Verify proper engagement | Adjust switch position |
| Pressure block | Confirm full engagement | Adjust pressure block |
| Delay relay | Test relay operation | Replace if faulty |
💡 Note: Front limit switch has lifespan of approximately 7,000 cycles. Replace preventively.
❌ Problem 4: Inconsistent Thread Length
| Possible Cause | Verification | Correction |
|---|
| Center screw loose | Visual/physical check | Tighten center screw |
| Insufficient clamping | Check clamp pressure | Adjust clamping force |
| Improper rebar positioning | Verify alignment | Reposition rebar squarely |
| Front limit switch failure | Test switch function | Repair or replace switch |
❌ Problem 5: Incomplete / Poor Thread Quality
| Root Cause | Indicator | Remedy |
|---|
| Improper rolling wheel adjustment | Uneven thread profile | Re-adjust rolling wheels |
| Excessive wheel wear | Smooth or damaged threads | Replace rolling wheels |
| Cracked rolling wheel shaft | Vibration or noise | Replace shaft assembly |
| Incorrect shim installation | Misaligned threads | Reinstall shims per manual |
❌ Problem 6: Difficult Feed Operation (Heavy Resistance)
| Inspection Area | Condition | Maintenance |
|---|
| Gear rack | Dry or corroded | Apply mechanical lubricant |
| Guide rods | Lack of lubrication | Clean and oil guide rods |
| Guide rod alignment | Non-parallel or bent | Check and realign rods |
❌ Problem 7: Circuit Breaker Tripping
⚡ ELECTRICAL DIAGNOSTICS
Check Sequence:
1. Short circuit in three-phase wiring
└─→ Inspect cable insulation
2. Motor burnout
└─→ Test motor windings
3. Insufficient interval between direction changes
└─→ Wait 2-3 seconds between forward/reverse
4. Defective circuit breaker
└─→ Replace breaker with correct rating
🔧 Daily Maintenance Schedule
🗓️ Daily Tasks (Per Shift)
| Task | Frequency | Responsible |
|---|
| Clean machine head and table chips | Every 4 hours | Operator |
| Remove chips (max thickness 5mm) | End of shift | Operator |
| Check cooling fluid level | Start of shift | Operator |
| Visual inspection of cutting tools | Start of shift | Operator |
🗓️ Weekly Tasks
| Task | Standard |
|---|
| Lubricate sliding rods and gears | Mechanical oil (ISO VG 68) |
| Check belt tension | Deflection 10-15mm at center |
| Inspect electrical connections | Tighten if loose |
🗓️ Monthly Tasks
| Task | Specification |
|---|
| Motor bearing lubrication | Lithium grease (every 500 hours) |
| Coolant replacement | When contaminated or depleted |
| Comprehensive tool inspection | Replace worn components |
⚠️ Safety Precautions
🚫 Prohibited Actions
| ❌ Do NOT | ✅ Do Instead |
|---|
| Operate without training | Complete certified training program |
| Touch rotating parts | Use proper tools, maintain safe distance |
| Run machine with faults | Perform pre-operation inspection |
| Use gas-cut rebar ends | Cut with cut-off saw only |
| Use oil-based coolants | Use water-soluble cutting fluid only |
🛡️ Personal Protective Equipment (PPE)
Required PPE:
┌─────────────────┐
│ ☑ Safety gloves │
│ ☑ Safety glasses │
│ ☑ Steel-toe boots│
│ ☑ Hearing protection (optional)│
└─────────────────┘
🔌 Shutdown Procedure
Complete current operation cycle
Press STOP button
Disconnect main power
Close cooling water valve
Hang "DO NOT OPERATE" warning tag
Clean work area
📞 Technical Support
For complex faults beyond preliminary diagnosis, contact:
Equipment Manufacturer: Authorized service center
On-site Electrician: For electrical faults only
Qualified Technician: For mechanical repairs
📌 Document Control
This guide provides preliminary troubleshooting steps. Always refer to the manufacturer's specific manual for your equipment model.
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