1. Abstract

Against the background of fast-growing global demand for high-precision mechanical parts, automotive components, hydraulic parts, mold shafts and aerospace accessories, manufacturers worldwide are searching for grinding machines that balance high accuracy, stable long-term performance, reasonable investment cost and flexible expandability. Our factory officially releases its semi-automatic cylindrical grinding machine. This plunge-type external grinder adopts heavy-duty cast iron structure, world-class key components, semi-automatic hydraulic feeding function and multiple optional modules. It can achieve roundness ≤0.0015 mm and surface roughness Ra ≤0.25 μm on standard test samples. It is suitable for mass-production grinding of various shaft-shape workpieces. This news covers machine structure, full technical parameters, core component introduction, standard & optional accessories, installation requirement, typical application cases and contact information for global buyers. Global importers, machinery distributors and end-user factories are welcome to contact us for quotation, sample-grinding test, full specification documents and factory visit arrangement.

Keywords: semi-automatic cylindrical grinder, plunge-feed grinding, high precision, OD grinding, optional internal grinding unit, shaft component machining

2.Machine Body Design & Core Mechanical Structure

2.1 Heavy-Duty Machine Base & Casting Technology

The whole machine main frame and structural castings use FC30 Meehanite high-grade cast iron. All castings go through artificial normalization heat treatment plus long-time natural aging treatment, to fully release internal stress caused by casting processing. The extended-length machine bed improves rigidity, suppresses vibration during heavy-stock-removal grinding and long-time continuous production. All key mounting surfaces are finished by one-time clamping on high-end machine tools from YASDA, MITSUI SEIKI, TOSHIBA and ELB. Machining accuracy reaches micron grade, laying a solid foundation for long-term repeat precision.

2.2 Guideway, Feed System & Automatic Lubrication

The grinding wheel head feed system applies classic one-V-one-flat hand-scraped guideway. Hand scraping ensures good contact surface and excellent vibration damping performance. Matched with precision ground ball screw and continuous automatic lubrication system:

· Realize smooth low-speed movement without creeping

· Guarantee outstanding repeat positioning accuracy

· Reduce wear on guide rails, extend machine service life

· Support automatic fast-advance & fast-retreat of grinding wheel head

The automatic oil supply system continuously feeds lubricant to guide rails and ball screws during machine running. The cooling liquid tank is fully separated from machine main body, effectively isolating coolant-caused vibration and improving heat dissipation effect.

2.3 Grinding Wheel Spindle Assembly

Grinding wheel spindle is equipped with Germany FAG high-precision bearings with sleeve-type structure (four bearings in front side, two bearings at rear side). This structure avoids direct metal-to-metal friction contact. It does not require independent lubrication circuit, greatly lowering daily maintenance workload. Spindle speed supports multi-step fixed speed:1650 /1850 /2100 RPM; stepless speed variation is also available. Normal maximum grinding linear velocity reaches 35 m/s; when equipped with high-speed grinding wheel, maximum linear velocity can hit 65 m/s. High linear velocity brings better surface finish for alloy steel, hard alloy and ceramic workpieces.

3.Processing Capacity, Accuracy Performance & Functional Modules

3.1 Main Processing Capacity

Item Specification Swing over bed 270 mm Max. distance between centers 600 mm Max workpiece weight (between centers) 60 kg Max workpiece weight (only workhead support) 20 kg X-axis minimum setting unit 0.001 mm Table rotation angle +9° /-6° Wheel head swing angle ±15° Workhead rotation angle 30° (Working head edge) Workhead spindle speed 10-500 RPM (pulley adjustment) Tailstock automatic stretching travel 32 mm Thimble taper MT4 for workhead & tailstock MT No.4

3.2 Key Accuracy Performance

When grinding standard test sample workpiece under correct operation and proper grinding wheel selection: · Roundness: ≤0.0015 mm · Surface roughness: Ra ≤0.25 μm Recommended stock removal: – Rough grinding: 0.03 ~0.05 mm – Finish grinding:0.01 ~0.015 mm Note: Actual final accuracy is affected by workpiece material, clamping condition, grinding wheel selection, coolant quality and operator setting. Machine accuracy inspection report will be provided together with delivery.

3.3 Workhead & Tail-Stock Function

Workhead supports simultaneous rotation / centering mode. Spindle through-hole diameter is 25 mm. Tail-stock adopts hardened alloy steel sliding sleeve inside cast-iron housing. MT4 thimble is installed. Thimble jacking force can be adjusted conveniently by rear knob. Optional hydraulic tailstock with foot pedal for quick loading and unloading heavy work-pieces, raising batch-production efficiency.

4.Optional Functional Units

4.1 Internal Hole Grinding Device (Optional) This optional attachment allows users to finish outer-diameter and inner-hole grinding without re-clamping workpiece, which reduces positioning error caused by repeated clamping. – Standard spindle speed: 20,000 RPM – Special high-speed version:35,000 RPM – Drive motor:0.75 kW – Machining range @20000RPM: Φ25-45 mm, max grinding depth 100 mm – Machining range @35000RPM: Φ12-25 mm, max grinding depth 60 mm

4.2 Other Optional Upgrades

1.Dual-axis digital optical scale system: achieve precise feeding readout up to 0.001 mm
2.Paper-type grinding fluid chip removal unit: filter metal chips from coolant, extend coolant service life
3.Iron filings separator: separate fine ferrous particles
4.Magnetic chuck & face plate (brand CHANDOX Taiwan)
5.Driving dogs / retractor set (6 pcs per set)
6.Extra-large safety protective cover for operator safety

5: Standard Accessories List & Main Components Sourcing

5.1 Standard Delivered Accessories All standard accessories are included in machine price.

5.2 Tank Capacity & Machine Dimension – Grinding wheel spindle oil tank

(hydrostatic-dynamic):120 L – Hydraulic oil tank:60 L – Coolant tank:80 L – Packing dimension(L×W×H):2900 mm ×2250 mm ×2100 mm – Net weight:2500 kg

6.Installation Environment Requirement & Typical Application

6.1 Installation Condition for Workshop Parameter Requirement Power supply 380V 3-phase AC Total installed power 6 kW Ambient working temperature 5℃ ~ 40℃ Coolant filtration Sedimentation tank / magnetic filter / paper tape filter Recommended cooling tank volume 120 L Installation suggestion: Place machine on reinforced concrete foundation. Use levelling blocks to calibrate machine level. Keep away from large vibration sources such as punching machines.

6.2 Typical Industry & Workpiece Application Scenarios

1.Automotive industry: transmission shaft, valve shaft, piston pin, rocker shaft
2.Hydraulic & pneumatic industry: piston rod, valve spool, hydraulic shaft sleeves
3.Mold & tooling: mold core shaft, mandrel, precision roller
4.General machinery: high-precision drive shaft, pin shaft, eccentric shaft
5.When equipped with optional internal grinding unit: parts need both outer and inner hole high-precision grinding

7: Buying Inquiry & Contact Information

Our Factory Profile

Our factory focuses on R&D and manufacturing of medium-high end cylindrical grinding machines. Our products are exported to Southeast Asia, Middle East, Europe and Latin-America. We provide complete service including machine selection suggestion, process consultation, sample grinding test, after-sales technical support and spare-parts supply for overseas clients.

What we can offer for global buyers:

✅ Detailed English technical specification PDF

✅ Sample grinding test service (send us your workpiece drawing)

✅ Machine layout drawing, foundation drawing

✅ Quotation including standard machine price & optional accessories cost

✅ Overseas after-sales support & spare-part supply plan

Contact Details

Company Name: Beijing Yuhen Machinery Co., Ltd.

Address: 1809, 15th Floor, Building 1, No. B12 Zhongguancun South Street, HaidianDistrict, Beijing

Contact Person: Ivy Chen

WhatsApp: +86-189-2559-3414

Email: mailto:Sales5@yuhenmachine.com