Mold Repair Service | Fix Broken Tools Fast, Get Back to Production
At Shanxi Fuding International Trade Co., Ltd. , we've been building and repairing injection molds for over 14 years. We know what breaks, why it breaks, and how to fix it without making things worse. Whether you crashed a core, wore out a cavity, or just need preventive maintenance before a production run, we deliver practical repairs that get your mold back in the press - fast.
What We Actually Repair
|
Damage Type |
What It Looks Like |
What We Do |
|
Cavity damage |
Dents, gouges, erosion from glass-filled materials |
Weld repair (laser or TIG), re-machine, re-polish to match original finish |
|
Broken cores / inserts |
Snapped off, cracked, chipped |
Remake from tool steel (D2, H13, S7), heat treat, fit to cavity |
|
Worn shut-offs |
Parts flash, steel fretting |
Weld build-up, re-machine shut-off surfaces, adjust fit |
|
Ejector pin damage |
Pins broken, holes worn oblong |
Replace pins, ream or EDM holes to correct size |
|
Cooling line leaks |
Water leaking from mold, rust in channels |
Weld leaking areas, re-drill, install plugs, pressure test |
|
Gate wear |
Gate blush, stringing, inconsistent fill |
Re-machine gate, re-polish, or replace gate insert |
|
Thread damage |
Stripped bolt holes, damaged threads |
Helicoil or Timesert installation, or re-tap larger |
|
Corrosion / rust |
Pitted surfaces from storage or cooling water |
Polish out minor pits; weld and re-machine for deep damage |
|
Broken lifters / slides |
Stuck, jammed, or fractured |
Remake or repair, re-fit to match existing travel |
Honest truth: Not everything can be fixed. If a cavity is smashed beyond weld repair or the mold base is cracked through, replacement may be cheaper. We tell you when to fix and when to scrap.
Our Repair Process (No Surprises)
1. Inspection & Diagnosis
You ship the mold or send photos/video
We inspect: damage extent, steel type, original surface finish, cooling circuit integrity
We provide fixed-price quote or hourly estimate (you choose)
Typical inspection time: 24-48 hours after receipt
2. Disassembly & Cleaning
Mold taken apart completely
Cooling lines flushed, scale removed
Components ultrasonically cleaned
Damaged parts identified and tagged
3. Repair Work
|
Method |
When We Use It |
|
Laser welding |
Precision repairs near shut-offs, fine details, minimal heat input |
|
TIG welding |
Larger cavities, structural repairs, pre-heat and post-weld heat treat as needed |
|
EDM / Wire EDM |
Re-cutting complex shapes, fixing broken cores with precise fit |
|
CNC machining |
Re-cutting cavity details after weld build-up |
|
Hand polishing |
Restoring surface finish to original spec (SPI-A1 to SPI-C1) |
|
Grinding |
Shut-off surfaces, mating faces |
4. Heat Treatment (If Required)
Stress relief after welding
Re-hardening if original hardness lost in weld area
Verification with hardness tester
5. Reassembly & Fit Check
All components refitted
Slide/lifter travel verified
Ejection system checked
Cooling circuit pressure tested (30-60 psi minimum)
6. Sampling (Optional but Recommended)
We run test shots on our injection machines (up to 600 tons)
Verify part dimensions, flash, surface finish
Adjust if needed before shipping
7. Return
Mold crated for shipment
Repair report with photos of before/after
Warranty: 90 days on workmanship
Lead Times (Realistic, Not Imaginary)
|
Repair Type |
Typical Turnaround |
|
Minor welding + polishing (single spot) |
3-5 days |
|
Broken core replacement (single) |
5-7 days |
|
Cavity weld + re-cut (complex shape) |
7-10 days |
|
Cooling line repair + pressure test |
5-7 days |
|
Full mold refurbishment (clean, tune, replace wear items) |
7-14 days |
|
Emergency rush (you pay extra) |
24-72 hours (call us) |
Rush policy: We can expedite, but other jobs move. Rush fee is 50% if we bump existing work.
What It Costs (Real Numbers)
We charge either:
Fixed price for defined repairs (you know cost upfront)
Hourly rate for unknown damage (we inspect first, estimate hours, call if over)
Typical costs (based on actual recent jobs):
|
Repair |
Cost Range |
Notes |
|
Weld one small pit + polish |
$150 – $300 |
1-2 hours work |
|
Replace broken ejector pin + ream hole |
$100 – $250 |
Pin not included |
|
Repair leaking cooling line (weld + re-drill) |
$300 – $800 |
Depends on access |
|
Remake small core (H13, heat treated) |
$600 – $1,500 |
Simple geometry |
|
Full cavity weld + re-cut + polish |
$800 – $3,000 |
Complex shapes cost more |
|
Complete mold teardown, clean, tune |
$500 – $2,000 |
2-3 day job |
|
Polish entire cavity (SPI-A1) |
$400 – $1,500 |
1-2 days |
Shipping: Customer pays both ways unless arranged otherwise.
When to Repair vs. When to Replace
|
Situation |
Repair |
Replace |
|
Small pit or nick in cavity |
✓ |
|
|
Broken core (single) |
✓ |
|
|
Worn shut-off surfaces |
✓ |
|
|
Leaking cooling line |
✓ |
|
|
Cavity shattered beyond weld |
✓ |
|
|
Mold base cracked |
✓ |
|
|
Multiple cavities worn out |
✓ (if cost per cavity > new tool) |
|
|
Old mold, no drawings, damaged beyond recognition |
✓ |
Rule of thumb: If repair cost exceeds 50-60% of new tool cost, replace. We help you do that math.
Real Examples (Photos Available on Request)
Case 1: Crushed Cavity Edge
Problem: Operator crashed core into cavity, gouged 3mm deep into shut-off surface. 20,000 parts waiting.
Fix: Laser weld build-up, re-machined shut-off, re-polished.
Time: 5 days rush
Cost: $1,200
Result: Back in press, parts good, tool ran another 150,000 cycles.
Case 2: Worn Hot Runner Gate
Problem: After 500,000 cycles, gate worn 0.2mm oversize. Parts had gate blush.
Fix: Machined gate insert, replaced with new.
Time: 4 days
Cost: $450 (insert + labor)
Result: Gate blush gone, tool back in production.
Case 3: Cooling Line Leak
Problem: Water leaking from corroded channel into cavity. Parts had rust stains.
Fix: Opened mold, welded channel closed, re-drilled new cooling passage offset. Pressure tested.
Time: 7 days
Cost: $1,800
Result: No more leaks. Tool runs 2 years later.
Case 4: Broken Lifter
Problem: Lifter snapped mid-cycle, jammed mold. Production stopped.
Fix: Remade lifter from H13, heat treated, re-fitted.
Time: 8 days (expedited)
Cost: $2,400
Result: Running again. Original failed due to design issue - we suggested modification, customer approved.
Preventive Maintenance - Cheaper Than Repair
We offer maintenance programs for customers who want to avoid emergency repairs:
|
Service |
What We Do |
Frequency |
Cost |
|
Basic clean & inspect |
Ultrasonic clean, check pins, cooling, surfaces |
Every 50K-100K cycles |
$300 – $600 |
|
Full tune-up |
Clean + replace wear pins, polish surfaces, pressure test cooling |
Yearly or 200K cycles |
$800 – $2,000 |
|
Storage prep |
Clean, rust-proof, protect for long-term storage |
Before storage |
$200 – $500 |
One customer saved $18,000 in emergency repairs over 2 years by doing yearly tune-ups.
What We Need From You
For a repair quote, send:
- Photos of damage (close-up, overall, multiple angles)
- Mold size (cavity count, approximate dimensions)
- Steel type if known (H13, P20, stainless, etc.)
- Original surface finish (high gloss, textured, etc.)
- Urgency (when do you need it back?)
- Part drawing if available (helps us match geometry)
- Don't have photos? Ship the mold. We inspect and quote within 48 hours.
Why Use Us for Repairs
14+ years building and fixing molds
In-house toolroom: CNC, EDM, welding, polishing, heat treat - all under one roof
Same standards as new tools: We don't patch and ship; we restore to functional spec
We test if you want: Sample parts before return
Honest assessment: We tell you when repair is throwing good money after bad
one-stop solution
professional team
high quality
Submit Your Repair Request
Option A: Email photos and details to repair@sxfuding.com
Option B: Fill out form below with description and upload images
Option C: Call +86-351-4221586 and ask for toolroom
We respond within 24 hours with quote or request for more info.
