Services

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CNC Machining

Materials: Aluminum alloy, Stainless Steel, Brass, Copper, Plastic (POM, ABS, PEEK, etc.)

Equipment: CNC lathe, CNC milling machines

Application: used in aerospace, medical equipment, automotive precision parts, automation equipment and other industries

3D Printing

Processing:

SLA: High precision, for appearance verification and display samples;

SLS: Suitable for industrial strength parts;

Material: Resin, Nylon, ABS, Stainless Steel, Aluminum alloy, etc.

Applicable: Structural verification, functional samples, product development stage

Injection Molding

Materials: ABS, PC, PP, PA, POM, TPU, TPE,etc.

Advantages: Smooth surface, Complex structure, High efficiency, support for two-color/rubber molding

Typical products: Electronic housings, home appliance parts, medical accessories, automotive interior parts, etc.

Vacuum Casting

Processing: Master model manufacturing (usually using SLA 3D printing) → Silicone mold → Vacuum injection → Finished product curing

Materials: PU resin, Soft rubber, Transparent material, etc.

Application: Appearance samples, functional test pieces, market verification pieces, small batch production pieces, etc.

Sheet Metal Service

Materials: Cold-rolled Steel plate, Stainless Steel, Aluminum plate, Copper plate, etc.

Processing: Laser cutting, Punching, Bending, Welding, etc.

Features: Low cost, flexible batch size, strong structural stability

Die Casting

Molding advantages:

- Excellent dimensional accuracy and surface quality

- Suitable for complex thin-walled structural parts

- High strength, suitable for structural load-bearing parts

Application: Automotive parts, LED radiators, Industrial connectors, Motor housings, etc.

Our Manufacturing Services at a Glance

Renjiu Machinery is set up as a single source for precision parts, so a project can move from the first prototype to series production without changing supplier. The core processes sit in one facility and share the same quality system.

Service	Best suited to	Typical tolerance	Low-volume route?
CNC Machining	Metal and plastic parts, tight tolerances, prototypes to medium volume	±0.05 mm routine, ±0.01 mm precision	Yes — no tooling
3D Printing	Complex geometry, rapid fit checks, organic shapes	≈ ±0.1 mm (SLS)	Yes — ideal for one-offs
Injection Molding	Plastic parts at volume, snap fits, housings	Per tool and resin	No — needs tooling
Sheet Metal Fabrication	Brackets, chassis, enclosures, panels	±0.1 mm typical	Yes — laser and press brake
Die Casting	Near-net metal housings at volume	Plus machining for critical faces	No — needs a die
Surface Treatments	Anodising, plating, coating, blasting	Cosmetic and protective	Yes

From Prototype to Production: How We Work

Drawing review. Our engineers read the drawing before quoting — flagging tolerances that are tighter than the function needs, features that are hard to hold, and material alternatives that cut cost.
Quote with a route. You get a price and a recommended process, not just a number.
First article. The first part is inspected and reported with actual measured values, so you approve what the machine really produced.
Production. Once the first article is signed off, the process is locked and the running parts match it.
Repeat orders. Drawings, programmes and inspection records stay with your part number, so a reorder produces the same part.

Quality and Documentation

Every service runs through the same inspection discipline: incoming material checks, first article inspection, in-process sampling on critical features and a final dimensional report where the drawing calls for it. Material certificates and inspection reports are supplied on request, and packing is matched to the part — from bubble wrap to custom trays for delicate or high-value components.

Industries We Serve

Our parts end up in demanding sectors, each with its own expectations:

Automotive — brackets, housings and EV components
Aerospace — weight-critical, traceable components
Medical devices — instruments, housings and implants
Electronics — heat sinks, enclosures and RF parts
Robotics — joint housings, reducers and end effectors
Industrial automation — manifolds, sensor housings and fixtures

Frequently Asked Questions

Can I use one supplier for machining, sheet metal and finishing?

Yes — that is the point of our setup. Consolidating processes avoids the tolerance stack-up and lead-time gaps that appear when parts travel between separate vendors.

Do you handle both prototypes and production?

Yes. The same engineers who prove the prototype also run the production order, so the process does not change under your part.

How do I get a quote?

Send a 2D drawing, a 3D model, or both, with the quantity and any finish requirement. Where a drawing is incomplete, tell us the function and we will fill in the detail.

What is a typical lead time?

Prototype machining is often measured in days, production in weeks depending on volume and material availability. We confirm a firm date with the quote.