3d printed injection molds - moldmaking technology stratasys.pdf · molds for this type of plastic...
TRANSCRIPT
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1 STRATASYS / COMPANY OVERVIEW
3D PRINTED INJECTION MOLDS
MARK BASHOR
CAN YOUR BUSINESS BENEFIT?
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2 STRATASYS / COMPANY OVERVIEW
THE 3D PRINTING SOLUTIONS COMPANY
WE ARE
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3 STRATASYS / COMPANY OVERVIEW
FROM SYSTEMS
TO SERVICE
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4 STRATASYS / COMPANY OVERVIEW
PresenterMark Bashor, Applications EngineerStratasys
Today’s Event
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5 STRATASYS / COMPANY OVERVIEW
AGENDA: 3D PRINTED INJECTIONS
Where Do 3D Printed Molds Fit?
Business Rationale
Customer Stories
Technical Tips and Tricks for Success
Q&A
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6 STRATASYS / COMPANY OVERVIEW
WHEN ARE 3D PRINTED MOLDS USED?
SECTION ONE
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7 STRATASYS / COMPANY OVERVIEW
WHICH STAGE?
Part Design
CAD software
Prototype 1
Concept modeling
Rapid prototyping
Simulation
Prototype 2 Manufacturing
3D Printed Injection MoldsFunctional
Real End Material*
Full Range Tests
Mold Verification
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8 STRATASYS / COMPANY OVERVIEW
VIDEO
01:32
Revolutionizing the Injection Molding Process Using 3D Printing
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10 STRATASYS / COMPANY OVERVIEW
WHICH PLASTICS?
0
100
200
300
400
500
5 17
100
40
500
100
300
70
Instances of UseThe number of times survey
respondents used PolyJetmolds for this type of plastic
Minimum Part YieldThe minimum number of parts survey respondents reported
producing per tool.
Maximum Part YieldThe maximum number of parts survey respondents reported
producing per tool.
Average Part YieldThe average number of parts survey respondents reported
producing per tool.
Uses Min. Max. Avg.
Soft / Elastomeric Plastics Standard Plastics
Based on 2014 customer survey (58% response rate)
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• Use plastics with molding
temperatures up to 300° C
(570° F). Candidates include:
PE, PP, PS, ABS, TPE, PA,
POM, PC-ABS and glass-filled
resins
• Produce mid-sized parts up to
165 cubic centimeters (10
cubic inches)
• Use up to 200-ton molding
machines
IDEAL CONDITIONS
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12 STRATASYS / COMPANY OVERVIEW
BUSINESS RATIONALE
SECTION TWO
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Very attractive ROI on small,
complex molds when
compared with machined
aluminum molds.
Return on Investment
This 3D printed HASCO standard mold insert empowers low-cost rapid prototypes.
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14 STRATASYS / COMPANY OVERVIEW
Savings vs. Frequency of Use
0
100,000
200,000
300,000
400,000
500,000
600,000
1-5/week(1 customer)
1-5/month(5 customers)
1-5/quarter(2 customers)
1-5/year(4 customers)
Estimated Savings$2,000 USD per tool
Estimated Savings$2,000 USD per tool
MAX. MIN.
Based on 2014 customer survey (58% response rate)
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15 STRATASYS / COMPANY OVERVIEW
CUSTOMER STORIES
SECTION THREE
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16 STRATASYS / COMPANY OVERVIEW
3D Printer: Objet260 Connex
Industry: Custom molding
Need:Small series production and prototypes from end-product material.
Diversified Plastics
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17 STRATASYS / COMPANY OVERVIEW
VIDEO
03:25
Diversified Plastics Customer Story
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19 STRATASYS / COMPANY OVERVIEW
3D Printer: Objet500 Connex
Industry: Medical device design house
Need:Speeding time to market in medical device product development for their customers
Worrell
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2,600
Worrell: MedTG
11,000
2
56
Traditional Tooling
3D Printed Tooling
Traditional Tooling
3D Printed Tooling
Time (Days)
Cost (USD)
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4,000
Worrell: OBMedical
12,000
3
84
Traditional Tooling
3D Printed Tooling
Traditional Tooling
3D Printed Tooling
Time (Days)
Cost (USD)
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22 STRATASYS / COMPANY OVERVIEW
Printer:
Objet500 Connex
Industry:
Consumer Goods
Need:
Prototypes from end-product material;
functional testing on living hinges, caps and
bottles.
Unilever
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Unilever
Cost Savings
Unilever was able to produce prototypes at 20% of the usual cost.
80%
Time SavingsUnilever can deliver
iterations 50 percent faster than traditional
model making methods.
50%
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“By 3D printing the injection molds with Digital ABS, we’re able to achieve the high quality associated with traditional manufactured prototypes, while ensuring that the high temperatures and pressures of the injection molding process can be sustained.”
Stefano CademartiriR&D, CAP and prototyping specialist at Unilever
Unilever
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25 STRATASYS / COMPANY OVERVIEW
Printer: Objet30Pro, Objet500 Connex
Industry: Automotive
Need:
• Prototypes from final material
• Functional tests for snap fits
• Electrical components over-molding
Seuffer
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Seuffer
40,000
Traditional Tooling
3D Printed Tooling
Cost (Euros)
2
56
Traditional Tooling
3D Printed Tooling
Time (Days)
1,000
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VIDEO
02:15
Seuffer Customer Story
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29 STRATASYS / COMPANY OVERVIEW
Printer: Objet500 Connex3
Industry: Pump manufacturing
Need:
• Production-ready prototypes
• Complex mold design with best
surface finish
Grundfos
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30 STRATASYS / COMPANY OVERVIEW
Injection molded part inside PolyJet mold
Grundfos
Side view of part with mold and sprue Final part produced from the PolyJet mold
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31 STRATASYS / COMPANY OVERVIEW
3D Printer: Objet500 Connex3
Industry: Water and heating systems for
mobile applications
Need:
Prototyping in production-grade materials for
faster time to market
Whale
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“This is revolutionary… I estimate we’ve shortened our R&D process up to 35%, and this is on top of the 20% we’re already saving on ourdesignwork. For me, it’s fantastic.”
Patrick Hurst Managing Director, Whale
Whale
PolyJet molds produce intricate details.
Pump diaphrams created using PolyJet molds.
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SECTION FOUR
TECHNICAL TIPS & TRICKS FOR SUCCESS
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Increase draft angle (2-5°)
• To facilitate ejection
• To reduce stress
Use sprue bushing
• Avoid direct contact between the molding machine’s nozzle and the PolyJet insert
• Incorporate the sprue in the mold base / steel plate
• Undersize the hole by 0.2 – 0.3 mm (0.008 – 0.012 in) and ream to size during mold assembly
Technical Tips & Tricks for Success
Increase draft angle – 5° recommended.
Standard sprue bushing.
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Bolt holes (green)
Ejection system (red)
• Add round holes for ejector pins
• Undersize by 0.2 - 0.3 mm (0.008 – 0.012 in)
• Ream to perfect fit
• Keep holes 2 mm (0.08 in) from edges to prevent thin walls
After 3D printing:
• Ream holes
• Confirm snug but smooth movement
Bolt Holes
Add holes for ejector pins (red).
Ream holes for core and ejector pins.
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• Increase cooling cycle time between shots to allow the mold to cool to a target temperature of 50 °C (120 °F)
• Accelerate cooling by blowing compressed air onto the core and cavity
• If cooling channels used, locate 8 – 10 mm (0.315 – 0.394 in) below the cavity surface
Cooling System
Cooling system.
Compressed air cools the core and cavity between cycles.
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MUD base (master unit die – preferred)
• Seat inserts in mold base pockets
• Confirm 0.2 mm (0.008 in.) beyond mold base
• Mill or add shims to adjust height
Steel plates
• Include or exclude the ejection system
• Confirm the mold is 20 - 25 mm (0.75 - 1.0 in) larger than the mold cavity on all sides
Mold Base Options
MUD base with PolyJet printed mold insert.
PolyJet molds with steel plates.
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Mold base (recommended)
• Largest investment
• Improved part quality
• Printed inserts can be smaller (no additional
frame needed)
Steel plate with ejection
• Mid-range investment
• Increased part complexity
Steel plate without ejection
• Smallest investment
• Fastest
Mounting Options
PolyJet molds mounted on steel plates.
Mold base (recommended).
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1. Remove support material
2. Smooth surfaces
• For extraction (optional):Lightly sand surfaces that rise in the pull direction with 180/220 grit sandpaper.
• For appearance (optional):Lightly sand all surfaces with 180/220 grit followed by 320/400 grit
Surface preparation
Sand cosmetic surfaces (green) for appearance.
Sand vertical surfaces (red) for extraction.
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Goal: Use conservative settings to extend the life of the tool.
• Start with very low pressures and temperatures
• Conduct test runs
• Inspect results
• Adjust as needed
Tool Longevity
Test shots to dial in injection parameters.
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Injection molding time limit: 20 seconds
Pack & hold phase: 0 kPa (0 psi) and 0 seconds
Shot size: 75% of standard volume
Barrel temperatures: Low end of resin recommendation
Injection speed:
• Low end of resin recommendation
• 10% to 20% of the machine’s maximum screw speed
Cooling cycle:
• Small, thin parts: 40 seconds
• Larger parts or thicker features: 90 seconds
Initial settings
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• Increase shot sizeTarget: 90% of volume
• Adjust packing pressure: 30 – 50% of injection pressure
• Increase hold time
• Try to avoid getting flash
If sink marks are present:
• Adjust barrel temperature
• Adjust injection speed
• Do not over-cool part. This will cause part to shrink and grab tool.
Trial shots
Threaded cap from mold.20% GF PP
Threaded cap from mold.20% GF PA 6/6
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• Mold temperature will rise with continuous operation (undesirable)
• Allow to cool between shotsTarget: 50 °C (122 °F)
• Measure mold temperature with IR gun
Either:
• Use extended dwell between cycles
• Accelerate with compressed air during dwell
Mold Temperature
Compressed air cools mold to 50 °C (120 °F).
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www.stratasys.com/webinar-injectionmolding
• Download webinar slides & documents
• View webinar on-demand
• Submit technical questions to engineer
More Information and Resources
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Questions?
www.stratasys.com/webinar-injectionmolding
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THANK YOU
Mark Bashor
Applications Engineer
Manufacturing Tools, VBU
Rancho Cucamonga, Ca