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Industrial design · Mechanical design · Electronics fit
Product Design & Engineering for Injection Molding
It has to look good, and it has to be moldable and ready for production. Hongqing's industrial designers, mechanical engineers and electronics engineers work in one team and design for injection molding from the first sketch. Industrial design starts at USD 1,500 per product, including 3 concepts and 2 rounds of revisions; once the design fee is paid, the files and IP are yours.
We'll sign an NDA before you send drawings · Or email info@dghongqing.com
3 concepts · 2 revision rounds
DFM checked during design
Design IP is yours
Reply within 1 business day
Design services
From form to a structure ready for production
Order a single service, or take the project all the way from design to production.
Form
Industrial design
Based on your target users, use cases and competitors, we develop form, colors, materials and finishes. You receive renderings; from US$1,500 per product.
Structure
Mechanical design
Housing split, snap fits, screw bosses, ribs and assembly, with wall thickness, draft and gates checked as we go. You receive a 3D mechanical model; with one set of 3D-printed prototypes from US$3,000.
Electronics
Electronics layout and integration
Space and wiring for the PCB, battery, buttons, connectors, display, lighting, speaker and sensors. You receive a complete 3D assembly model; electronics and PCB design are quoted separately.
Design process
How a design project runs
Deliverables for each step are agreed before we start, and revision rounds are written into the quote.
01
Brief
We go through functions, target market, cost range and reference products, then agree the scope and quote.
02
Design concepts
We present 3 design directions; once you pick one, we finalize it within 2 rounds of revisions.
03
Mechanical design
We complete the internal structure and assembly method, checking manufacturability at the same time.
04
Prototype testing
We make 3D-printed prototypes to check appearance, fit and assembly, and revise based on the results.
05
File delivery
We deliver the approved 3D files, ready for tooling and production at Hongqing; once design fees are paid, the files and IP are yours.
Design for production
Six things to solve in design so a product looks good and can be mass-produced
Handling these at the design stage means fewer changes after tooling and a more predictable schedule.
Wall thickness and ribs
Keep walls as uniform as possible; big differences between neighboring sections cause sink marks and warpage. Where strength is needed, add ribs instead of thickening the whole wall. Ribs are usually 50%–60% of the main wall thickness with a radius at the base, which keeps sink marks off cosmetic surfaces. Exact values are set during the DFM review based on the material and part size.
Snap fits, screw bosses and assembly order
Snap fits need the right interference and room to flex, so parts go together, come apart and stay tight. Screw bosses are placed according to load and how often the product will be opened; where it will be opened repeatedly, we use heat-set inserts. The assembly sequence is planned during design to avoid parts interfering and to make work easier on the assembly line.
Draft and parting lines
Side walls need enough draft, and textured surfaces need more draft than smooth ones, to prevent drag marks and ejector stress marks. Parting lines, witness lines and gates go where they won't be seen, and no ejector pin marks are left on cosmetic surfaces. Where an undercut can be designed out, we do it; removing a slide or lifter also lowers mold cost.
Materials and finishes
Choose the material first, based on strength, heat resistance and flame retardancy, then the color and texture. Each finish places its own demands on the design: high-gloss surfaces must avoid weld lines, silk screening needs a flat print area, pad printing handles curves and small areas, and conductive coating needs a defined spray zone.
Space for electronics
Electronics space is planned with the electronics engineer during mechanical design. The PCB, battery, buttons, connectors, lighting and sensors get placement and routing space, with assembly clearance and locating features so nothing interferes or rattles after assembly. Buttons need the right travel and feel, and connectors must line up with the openings in the housing.
Water sealing
Waterproof products, such as electric toothbrushes, need seal grooves in the structure or two-shot overmolding to seal them, and the sealing at buttons and ports is designed at the same time. Waterproofing is finally verified by testing prototypes and mold trial samples.
Design team
Design and manufacturing under one roof
Designers can ask our mold and molding engineers at any time, so problems in the drawings are solved before tooling.
Industrial design
Simple projects are handled by our in-house designers; complex ones with 1S DESIGN in Shenzhen, a studio founded by Hongqing's owner.
About 1S DESIGN →
Mechanical engineering
Housing structure, snap fits and assembly, mold feasibility and DFM, in the same team as our mold engineers.
Explore mold making →
Electronics development
Electronics concepts, PCB layout and mechanical fit, and functional testing, for smart devices and other powered products.
See our development process →Have renderings, sketches or an idea? Send them over
Our Sales Manager, Coya Xiang, replies within one business day, and we can sign an NDA first if you need one.
Frequently Asked Questions
More answers on our FAQ page → Design pricing and MOQ → NDA, payment terms and mold ownership →
What does Hongqing's industrial design fee include?
Hongqing's industrial design starts at USD 1,500 per product. It includes a briefing, 3 design directions and 2 rounds of revisions, and delivers final approved renderings covering form, color, material and surface finish. The number of revision rounds is written into the quote, and we confirm with you before any extra round. Industrial design does not include mechanical design or prototypes; mechanical design plus one 3D-printed prototype starts at USD 3,000 per product. Once the design fee is paid, the files and IP are yours.
I only have renderings. Can Hongqing take over the mechanical design?
Hongqing can take your renderings or early 3D model and complete the mechanical design. The work covers splitting the housing, snap fits, screw bosses, ribs, electronics layout and assembly sequence, while checking that wall thickness, draft and parting lines suit injection molding. Where the styling would cause tooling problems, such as undercuts, thin edges or shapes that won't release from the mold, we propose changes and agree them with you before revising. Mechanical design includes one 3D-printed prototype and starts at USD 3,000 per product.
How does Hongqing reduce mold rework during mechanical design?
Hongqing checks manufacturability while the design is drawn, because our mechanical and mold engineers work in one team. The DFM checks cover uniform walls with ribs instead of thick sections, enough draft on side walls, parting lines and gates kept off cosmetic surfaces, snap fits and screw bosses designed around the assembly sequence, and space reserved for electronics and seals. A 3D-printed prototype then checks appearance, fit and assembly, so problems are fixed on the drawing before the mold is built.
What files do I receive after design, and can I produce them elsewhere?
Hongqing lists the design deliverables in the quote before work starts. They usually include renderings, a 3D mechanical model and a full assembly model, plus the files revised after prototype testing. Once the design fee is paid, the files and IP are yours, and you can tool and produce with Hongqing or another factory. Tooling with Hongqing saves a second manufacturability review: once the prototype is approved, the design goes straight to our mold shop, with tooling from 30 days.
Send us what you have. We'll map out the route to mass production.
Wherever you are in development, we'll propose the right manufacturing plan, from early design review through tooling and molding to finishing, assembly and shipping, and move your project step by step to mass production.
Helpful to include: sketches, drawings or 3D files, annual volume and target market.
Product Design & Engineering at a Glance
| Team | In-house industrial designers for simple projects, partner studio 1S Design for complex ones, plus in-house mechanical (structural) and electronics engineers |
|---|---|
| Services | Product positioning, industrial design, mechanical design, electronics development, DFM |
| Model | OEM (build to print) and ODM (develop from your idea or brief) |
| Focus industries | Consumer electronics and 3C enclosures, smart hardware, home appliances, automotive parts |
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