Injection Molding
Tooling and molding for your repeat plastic parts.
YOUR INTERFACES · YOUR CONDITIONS · YOUR ACCEPTANCE
Bonded Fin Heat Sinks
for Your Fin Layout, Joint & Assembly
Build your review around the connection between each fin and the base. Compare material combinations, fin spacing, bondline control and the evidence you need before approving a bonded fin heat sink.
Illustrative component concept
Drawing
Critical geometry & interfaces
Materials
Grades, condition & compatibility
Joining
Defined route & final state
Evidence
Agreed methods & records
Start with Your Fin-to-Base Assembly Requirements
Review fin geometry, the actual joining route and your installed conditions together. Define the final fit and evidence before approving the assembly.
- Specify fins, slots and base features
- Define the fin-to-base joining route
- Review airflow, temperature cycles and vibration
- Agree final flatness and joint evidence
- Confirm the sample and acceptance evidence
Fin geometry
Specify fin thickness, clear spacing, height and the base-slot layout.
Joint definition
Identify the adhesive or metallurgical joining route; do not leave the joint as an unstated assumption.
Service conditions
Share temperature range, thermal cycles, vibration and the installed airflow.
Finished fit
Define mounting datums and heat sink base flatness after joining and any final machining.
Illustrative engineering concepts
Compare 4 Route Decisions for Your Geometry
Compare the joint route and acceptance needs together. Your drawing and service conditions determine suitability; the images illustrate structures, not confirmed company capability.
Adhesive-Bonded Fins
Define surface preparation, adhesive, bondline and service conditions.
Review route requirements →
Brazed Fin Assembly
Review base, fins, filler, joining access and the final inspection state.
Review route requirements →
Integral Extruded Fins
Compare a one-piece profile when its geometry and order scope suit your assembly.
Review route requirements →
Your Released Joint
Record the selected materials, joining route, final features and acceptance evidence.
Review route requirements →Illustrative engineering concepts
Choose Your Fin-to-Base Joint Deliberately
FIN LAYOUT & BASE FEATURES↓MATERIAL & FIN JOINT↓SAMPLE & AGREED CHECKS↓APPROVED FINISHED PART
Separate fins seated in a base let you review fin geometry and base features independently. Your bonded fin heat sink manufacturing service must define the actual joining route: an adhesive joint and a brazed joint need different materials, processing and acceptance evidence.
- Identify the complete material and joining system.
- Review your critical interfaces in their final production state.
- Agree sample evidence before repeat-order release.
Compare Material References, Then Confirm Your Final Condition
Bulk stock properties help you review conduction and mass. These are sourced material references, not LK MFG part tests, approved material substitutions or post-joining performance guarantees.
Typical thermal conductivity
Hydro 6061-T6 at 25°C; Gabrian 6063-T5 typical. KME Cu-ETP annealed at 20°C.
Density reference
Calculate finished mass from the actual geometry. A material conductivity difference does not establish a device-temperature reduction.
| Grade | European reference | Si | Fe | Cu | Mn | Mg | Zn | Al |
|---|---|---|---|---|---|---|---|---|
| 6061 | EN AW-6061 · AlMg1SiCu | 0.40–0.80 | ≤0.70 | 0.15–0.40 | ≤0.15 | 0.80–1.20 | ≤0.25 | Balance |
| 6063 | EN AW-6063 · AlMg0.7Si | 0.20–0.60 | ≤0.35 | ≤0.10 | ≤0.10 | 0.45–0.90 | ≤0.10 | Balance |
| C11000 | Cu-ETP · CW004A | — | — | ≥99.90 | — | — | — | — |
Selected elements only. Dash means not specified in this summary, not zero. 6061: Cr 0.04–0.35%, Ti ≤0.15%; 6063: Cr/Ti ≤0.10% each. C11000: O ≤0.040%; do not relabel Cu-ETP as oxygen-free copper. Aluminum other elements ≤0.05% each / ≤0.15% total. The purchasing standard and certificate govern. Confirm product form, temper, joining compatibility and required final condition.
Sources: Hydro 6061 → · Gabrian 6063 → · KME Cu-ETP →
3 Views for Your Thermal Review
Use calculations to frame your questions. Request measured curves or CFD only with an agreed geometry, boundary conditions and validation scope. Every example here is illustrative.
1 · Bond-layer calculation
Hypothetical example only: R = t/(kA), with k = 1 W/(m·K), A = 0.01 m² and t as labelled. These chosen inputs are not an adhesive data sheet, a validated bondline or a finished heat sink test.
2 · Temperature allowance
Chosen example: 75°C limit minus a reference of 25, 35 or 45°C gives 50, 40 or 30 K. Define whether your reference is ambient, inlet fluid or another measurement point.
3 · Follow your heat path
HEAT SOURCE + TIM↓BASE → JOINT → FINS↓INSTALLED AIRFLOW
A conceptual path, not a CFD result. Agree heat-source area, power, contact stack, sensor locations, airflow and orientation.
Review Your Surface and Handling Requirements
Review thermal contact faces, mounting features and fin handling separately. Confirm finish compatibility with the specified joint and service environment.
Define the final contact pad, coating exclusions and inspection state.
Protect critical threads, interfaces and joint surfaces according to the agreed finishing route.
Agree cleaning access, fin protection and handling that preserves the released geometry.
A finish is not a universal cooling improvement. Confirm its purpose, compatibility and inspection state. Review surface finishing options →
Illustrative engineering concepts
Define Your Functional Features
Put the fin layout, joining interfaces, final contact area and assembly datums on your drawing.
Illustrative fin-to-base joint concept
Contact footprint
Heat-source map, TIM and clamping stack
Fin-to-base joint
Slot engagement, joint route and surface preparation
Mounting datums
Hole pattern, datum scheme and tool access
Fin geometry
Thickness, spacing, height and airflow orientation
Final condition
Flatness, masking, protected interfaces and inspection state
Resolve 6 Design Risks Before Your Order
Review your fin joint, installed airflow, final fit and acceptance evidence before production.
Bond integrity
Agree a fin bond integrity verification method, sampling and acceptance criteria. A visual check alone does not establish bond strength.
Your input
Controlled drawing and the relevant service conditions.
Your acceptance
Agreed method, inspection state, limits and required records.
Illustrative engineering concept
Thermal cycling
For bonded heat sink thermal cycling, specify cycle limits, dwell, transitions, number of cycles and the checks before and after cycling.
Your input
Controlled drawing and the relevant service conditions.
Your acceptance
Agreed method, inspection state, limits and required records.
Illustrative engineering concept
Fin spacing
Review bonded fin heat sink fin spacing against installed airflow, cleaning access and the protection needed during handling.
Your input
Controlled drawing and the relevant service conditions.
Your acceptance
Agreed method, inspection state, limits and required records.
Illustrative engineering concept
Mixed metals
Copper fins with an aluminum base require review of the joining method, expansion mismatch, environment and corrosion protection.
Your input
Controlled drawing and the relevant service conditions.
Your acceptance
Agreed method, inspection state, limits and required records.
Illustrative engineering concept
Base flatness
Specify the final inspection state, datums, restraint and contact area; assess distortion after the joining operation.
Your input
Controlled drawing and the relevant service conditions.
Your acceptance
Agreed method, inspection state, limits and required records.
Illustrative engineering concept
Machining sequence
For bonded fin heat sink machining, agree which base features are cut before joining and how finished fins are supported and protected.
Your input
Controlled drawing and the relevant service conditions.
Your acceptance
Agreed method, inspection state, limits and required records.
Illustrative engineering concept
5 Checkpoints from Drawing to Repeat Supply
Drawing review
Confirm revision, interfaces and operating inputs.
Route review
Agree materials, joining and final machining.
Sample build
Review the finished component and assembly fit.
Agreed checks
Assess specified dimensions, joints and test records.
Production release
Release the accepted revision, packaging and repeat-order scope.
Approve the Joint and the Finished Assembly
Illustrative component concept
Your prototype bonded fin heat sink should establish drawing revision, material identity, joint process and the agreed inspection plan. Bond strength, thermal cycling and thermal resistance are separate requirements with their own conditions; agree which records belong in your sample package.
- Material identity and drawing revision
- Final contact face, mounting and interface dimensions
- Specified joining and test evidence
- Port or fin protection and shipment release
Review Your Application, Not Just the Outside Shape
Project suitability, manufacturing scope and required records are confirmed from your drawing. These are application review topics, not customer case studies or system certifications.
Power electronics
Match module footprint, insulation, clamp load and the heat-source map.
Inverters and drives
Review switching heat loads, service temperatures and mounting interfaces.
Energy equipment
Agree operating conditions and the component acceptance scope.
Laser power supplies
Review temperature stability requirements, airflow and service access.
Compute components
Review the exact device footprint, airflow path, mounting interfaces and enclosure clearance.
Test equipment
Identify instrument clearances, heat loads and service access.
Thermal test fixtures
Define contact layout, airflow conditions and the agreed validation scope.
Industrial controls
Match the enclosure interfaces, airflow openings and maintenance plan.
Illustrative assembly and application review topics; no customer case study, system certification or universal fit claim. Explore application requirements →
6 Inputs for Your Bonded Fin Heat Sinks Quote
- CAD, fin layout + controlled drawing
- Heat load, airflow + temperature range
- Fin and base grades + material condition
- Joint route + bond acceptance requirements
- Mounting, final flatness + finish
- Prototype quantity + repeat demand
Ask your quote to separate component manufacturing, joining, finishing, inspection and any independently agreed validation. The drawing review confirms availability, quantities and delivery scope.
Answers Before You Specify
How is fin bond integrity verified on a bonded heat sink?
Agree the method before the sample: joint preparation and process records, visual criteria and any specified mechanical or section checks. Define sample quantities and limits. Do not treat a clean-looking joint as proof of bond strength.
Can bonded heat sink fins use a different metal from the base?
It is a design option to review, not an automatic substitution. Check the joining method, thermal expansion, service temperature, environment and corrosion protection with your assembly.
What thermal cycling requirements should my quote include?
State temperature limits, dwell and transition conditions, cycle count, restraint, inspection intervals and acceptance criteria. Agree whether joint, dimensional and thermal checks are needed before and after cycling.
How does a bonded fin design differ from a brazed heat sink?
Here, adhesive bonding means a polymer-based joint; brazing uses a lower-melting filler metal to form a metallurgical joint. The joint temperature capability and qualification depend on the actual materials and process, so specify the route explicitly.
What information is needed for a bonded fin heat sink quote?
Send the fin and base drawing, joining requirements, material grades, operating conditions, critical fits and quantities. Ask for prototype and repeat-supply scope to be identified separately.
Does a low-resistance bond guarantee a lower device temperature?
No. Joint resistance is one part of the path. Contact interfaces, base spreading, fin geometry and installed airflow also affect the result. Compare the complete assembly under the same test conditions.
