Fabrication shop with robotic welding cells at Songyan Machinery

Home
Capabilities

Machining & Fabrication Capabilities

Turning, milling, grinding, cutting, welding and fabrication, supported by in-house heat treatment, gear cutting, coating and inspection. One production plan takes your part from raw material to a finished, documented component.

6Core processes

1–30,000 kgPart weight

0.01 mmPositioning accuracy

50 tTable load

One process route

Every operation under one roof

A typical welded and machined component passes through up to ten operations. Because all of them run in our own workshops, weld preparation, machining allowances and inspection points are planned together, and your part never waits in transit between subcontractors.

MaterialCertified plate, bar, forgings or castings, verified by spectrometer.
CuttingLaser, plasma or flame cutting with weld bevels prepared.
FormingBending on a 400 t press brake and plate rolling.
WeldingRobotic, submerged arc, TIG and MIG welding to WPS.
Stress reliefThermal or vibratory stress relief before machining.
MachiningBoring, milling and turning to datum on CNC centers.
Heat treatmentQ&T, normalizing, carburizing or induction hardening.
GrindingFinish grinding of journals, faces and gear teeth.
InspectionCMM, NDT and material testing to your control plan.
Coating & packingBlasting, painting, rust protection and export crating.

CNC vertical turn-mill center for large rings, discs and housings

Large CNC-turned connection flange with drilled bolt circle

Process 01 · Turning

Process 01

CNC Turning & Turn-Milling

Shafts, flanges, rings, hubs, sleeves, discs and bowls are turned on horizontal CNC lathes and vertical turning centers. Turn-mill centers with a C-axis and automatic tool changer also mill flats, drill bolt circles and cut keyways in the same clamping, eliminating re-fixturing errors on large rotating parts.

Long shafts are turned between centers with steady rests and finish-ground wherever bearing journals require it.

Vertical turning: Up to the Ø3,200 mm class, 2,000 mm height, 15 t table load
Turn-milling: C-axis indexing to 0.001°, live milling and drilling, ATC
Horizontal turning: Heavy-duty CNC lathes for shafts, rolls and spindles
Typical finish: Ra 1.6–3.2 µm as turned; Ra 0.4–0.8 µm after grinding
Typical parts: Main shafts, flanges, slewing rings, hubs, bowls, sleeves

Large horizontal boring and milling center with 50-tonne table

CNC-milled and bored wind turbine gearbox housing

Process 02 · Milling

Process 02

CNC Milling, Boring & 5-Axis

Gearbox housings, machine beds, frames, valve bodies and brackets are machined on horizontal boring and milling centers, gantry machining centers and 5-axis gantries. Rotary tables allow four faces to be machined in a single setup, keeping bearing bores coaxial and faces square.

For long components, 4-metre planer-type gantry mills machine beds and slideways in one continuous pass.

Horizontal boring: X 5,000 × Y 3,200 × Z 2,500 mm, table load up to 50 t
Gantry machining: X 4,230 × Y 2,650 mm class, plus 5-axis gantry centers
Positioning accuracy: 0.01 mm; 0.008 mm on precision horizontal centers
Operations: Line boring, face milling, drilling, tapping, contouring, 5-axis surfaces
Typical parts: Gearbox housings, torque arms, planet carriers, machine bases, BOP bodies

Precision CNC cylindrical grinding machine

Process 03 · Grinding

Process 03

Precision Grinding

Cylindrical, surface and gear grinding finish the features that determine service life: bearing journals, seal diameters, mating faces and hardened gear teeth. Grinding follows heat treatment, removing quench distortion and holding final size on the hardened surface.

Cylindrical grinding: Up to Ø630 × 4,000 mm; also Ø500 × 3,000 mm and Ø320 × 1,500 mm machines
Surface grinding: Mounting faces, slideways, wear plates
Gear grinding: Spur and helical teeth after carburizing or induction hardening
Typical finish: Ra 0.4–0.8 µm; IT5–IT6 diameters on suitable geometry

Process 04 · Cutting

Process 04

Laser, Plasma & Flame Cutting

Plate, tube, bar and structural sections are cut from nested programs generated directly from your DXF or 3D model. High-power fiber lasers deliver clean, narrow kerfs on thin and medium plate, while plasma and oxy-fuel handle heavy sections. Weld bevels are cut at this stage for accurate fit-up before the first tack.

Fiber laser, plate: 20 kW large-format cutting bed
Fiber laser, tube: 12 kW tube and profile cutting
Heavy plate: Plasma and oxy-fuel cutting with bevel preparation
Bar and section: Band-saw cutting of round, square and structural sections

Robotic welding positioners for heavy fabricated frames

10-axis robotic welding system with 6-tonne positioner

Process 05 · Welding

Process 05

Robotic & Manual Welding

Long, repeatable seams run on robotic cells with heavy-duty positioners; thick-section joints are filled by submerged arc; root passes and stainless work are carried out by TIG. We weld to your symbols, WPS and NDT requirements, and full-penetration joints are verified by UT or MT before machining.

Robotic welding: 10-axis system, 360° positioner, Ø3,650 mm, 6 t capacity
Processes: Pulsed MIG/MAG (550 A), TIG (400 A), submerged arc (1,250 A)
Materials: Carbon, low-alloy, stainless and duplex steels
Weld inspection: Visual, MT and UT; HAZ hardness checks where specified

Fabrication shop with robotic welding cells and fixtures

Welded, machined and painted generator housing

Process 06 · Fabrication

Process 06

Welding & Fabrication

Weldments leave our works as finished components: cut, formed, welded, stress-relieved, machined to datum, blasted and painted. Stress relief is performed thermally in a trolley tempering furnace or by vibratory stress relief before final machining, so bores and faces stay exactly where the drawing places them.

Modular fixtures hold assemblies square during welding and are retained for repeat orders.

Forming: CNC press brake, 400 t × 3,200 mm
Stress relief: Trolley tempering furnace; vibratory stress relief
Post-weld machining: On boring and gantry centers with up to 50 t table load
Finishing: Shot blasting, automatic coating line, paint booths
Typical parts: Machine bases, motor and generator housings, skids, frames, welded rotor shafts

Heat treatment

Ten furnaces cover normalizing, quenching and tempering, annealing and solution treatment. A forklift quench line transfers parts into the tank in as little as 30 seconds for full through-hardening.

Induction hardening to 12 mm depth
Carburizing for gears and racks
Vacuum and pit furnaces
Forced air-cooling pit

Gear hobbing machine cutting a large gear rim

Gear cutting

Hobbing, shaping and grinding of spur, helical and internal gears, splines and racks, from fine-pitch racks to coarse-module gear rims.

Gear racks, module 0.5–36
Internal ring gears and splines
DIN 5–DIN 10 precision

Automatic surface coating line for machined parts

Surface treatment & coating

An automatic coating line and paint booths apply primer and topcoat after machining. Plating and conversion coatings are selected to suit the service environment.

Zinc, nickel and hard chrome plating
Black oxide and phosphating
Epoxy and polyurethane paint systems
Laser cladding repair of shafts and flanges

At a glance

Capability summary

Machine capacities and typical results by process. Achievable tolerances depend on part size, material and geometry and are confirmed for every drawing.

Summary of Songyan Machinery machining and fabrication capabilities
Process	Maximum capacity	Typical accuracy / finish	Typical parts
CNC turning & turn-milling	Ø3,200 mm class × 2,000 mm, 15 t	0.01 mm · Ra 1.6–3.2 µm	Shafts, flanges, rings, hubs, bowls
CNC milling & horizontal boring	X 5,000 × Y 3,200 × Z 2,500 mm, 50 t	0.008–0.01 mm	Gearbox housings, frames, valve bodies
5-axis & gantry machining	X 4,230 × Y 2,650 mm class	0.01 mm	Planet carriers, beds, complex housings
Cylindrical grinding	Ø630 × 4,000 mm	IT5–IT6 · Ra 0.4–0.8 µm	Bearing journals, rolls, spindles
Laser cutting	20 kW plate · 12 kW tube	Clean narrow kerf	Blanks, gussets, tubes, profiles
Robotic welding	Ø3,650 mm positioner, 6 t	Visual, MT, UT verified	Rotor shafts, frames, housings
Forming	400 t × 3,200 mm press brake	—	Brackets, covers, channels
Heat treatment	10 furnaces · induction to 12 mm	Hardness to drawing	Shafts, gears, racks, wear parts
Gear cutting	Racks module 0.5–36	DIN 5–DIN 10	Racks, spur, helical and ring gears

Capabilities FAQ

Questions about our processes

Still unsure whether we can make your part? Send the drawing and we will confirm within the quotation.

Send a drawing

Can Songyan Machinery handle a part that needs cutting, welding, machining and painting?

Yes. Cutting, forming, welding, stress relief, CNC machining, heat treatment, grinding, inspection, coating and export packing all take place in our own workshops in Jiangyin. You place one order and receive a finished, documented part.

Do you machine customer-supplied castings and forgings?

Yes. We regularly machine free-issue castings and forgings. Incoming parts are inspected and recorded on arrival, and we can add NDT, 3D scanning of as-cast surfaces and chemical verification before machining starts.

Are welded parts stress-relieved before machining?

Yes, when the design requires it. Weldments are stress-relieved thermally in a trolley tempering furnace or by vibratory stress relief before final machining, so bores and faces remain stable after machining.

What surface roughness can you achieve?

Typical results are Ra 1.6–3.2 µm for turned and milled surfaces and Ra 0.4–0.8 µm for ground surfaces. Finer finishes can be achieved on suitable geometry and are confirmed during drawing review.

Can you machine large parts on 5-axis equipment?

Yes. Our 5-axis gantry machining centers handle large housings and carriers in a single setup, and horizontal boring centers with rotary tables machine four faces of parts up to 50 t in one clamping.

Request a quote

Send your drawings. Get a price and lead time.

Email sales@symachiningparts.com or message us on WhatsApp at +86 189 1530 7612. All drawings are treated as confidential.

Open the quote form Chat on WhatsApp