Linear Guide Manufacturing Process Precision Rail & Block Production

Linear guides are a key part of high-precision mechanical systems. Their manufacturing process directly affects the movement accuracy, durability, and reliability of machines.
At DLY, we strictly control every step of production. From raw material inspection, heat treatment, straightening, precision grinding, to final assembly, each process ensures excellent performance of our linear guides in industrial automation, CNC machines, and other high-precision equipment.

1.1 Raw Material Inspection and Storage
The manufacturing starts with strict inspection of raw materials. Steel entering our factory is checked for chemical composition, hardness, surface defects, and straightness. Only materials that meet our standards are stored for production.

Tips:

Store materials in a dry, safe place to prevent bending or oxidation.
Long-term stored materials should be checked regularly for rust protection.

1.2 Cutting Raw Material

Steel is cut to the length required by the customer. We ensure flat and clean ends without burrs. Cutting speed and cooling are carefully controlled to avoid heat stress.

1.3 Induction Hardening and Tempering
High-frequency induction hardens the surface of the rail, improving wear resistance. Tempering releases residual stress and maintains core toughness.
Tips:

Heat treatment temperature and time must be strictly controlled. Too high may cause cracking; too low affects durability.

Long rails should be heated evenly to avoid warping.

1.4 Surface Treatment
After heat treatment, rails receive anti-rust treatment to improve corrosion resistance. A clean surface also reduces the risk of scratches during grinding.

1.5 Heat Treatment Buffer Storage
Rails are stored in a dedicated area to cool and stabilize before straightening. This step balances material stress and reduces deformation.

1.6 Rough Straightening (Roll, Twist & Press)
Rails often bend or twist after heat treatment. We use multiple straightening methods:

Roll Straightening: Rails roll between cylinders to remove overall bending, ideal for long rails.
Twist Straightening: Applies torque to correct twists and maintain parallel surfaces.
Straightening Press: Localized pressure corrects small bends to achieve micron-level accuracy.

Tips:

Parameters for each method are adjusted based on rail length, cross-section, and material.
Straightened rails are measured to avoid new residual stress.

1.7 Hole Machining
Holes are made for mounting bolts. Accurate holes ensure smooth assembly and alignment.
Tips: Ensure the reference surface is flat before drilling to avoid misalignment.

1.8 Pre-Cutting Storage
Rails are temporarily stored before cutting to keep them straight and safe from handling damage.

1.9 Precision Cutting
Rails are cut to final length with a grinding wheel, keeping ends flat and ready for precision grinding.

1.10 Post Machining
Minor adjustments such as chamfers, slots, or custom interfaces are completed to meet design requirements.

1.11 Middle Straightening
Before precision grinding, rails are straightened again to improve straightness and torsion, providing a stable reference for high-precision grinding.

1.12 Surface & Groove Grinding
Rails are ground to achieve flat mounting surfaces and precise rolling grooves. Surface roughness and groove accuracy are strictly controlled.

Tips:

Maintain clean cooling fluid and control grinding pressure.

Grinding sequence and tool pressure must be precise to avoid scratches or micro-cracks.

1.13 Accuracy Inspection
High-precision instruments measure straightness, parallelism, groove size, and surface roughness to ensure quality.

1.14 Final Straightening
A last straightening step ensures rails run smoothly with low friction after slider assembly.

1.15 Rail Cleaning
Rails are cleaned thoroughly to remove oil and debris, ensuring a clean reference for slider installation.

Rail Manufacturing Process

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2.1 Raw Material Inspection and Storage
Slider materials are checked for hardness, chemical composition, dimensions, and surface quality before storage. This ensures stable machining.

2.2 Slider Rough Machining

Cut slider blocks
Store semi-finished products
Upper face milling
Determine full length

Hole machining (HSR15~HSR25 processed simultaneously)

Tips: Control cutting depth and speed to ensure hole accuracy and full length.

2.3 Vacuum Carburizing and Hardening
Critical surfaces, including the rolling groove, are hardened to improve wear resistance while maintaining core toughness.

2.4 Heat-Treated Storage
Sliders are stabilized after heat treatment to prevent warping and stress concentration.

2.5 Surface Grinding
Slider reference surfaces are ground for flatness and dimensional accuracy.

2.6 Groove Grinding
Internal grooves are ground precisely to ensure smooth rolling contact with balls.

2.7 Slider Cleaning
Remove all machining residues and particles for a clean rolling and lubrication system.

2.8 Assembly and Adjustment
Install balls and lubrication components. Preload is adjusted to ensure smooth fit with rails.

2.9 BC Grinding
External shape and mounting surfaces are ground to improve overall precision and rigidity.

2.10 Final Assembly
Complete ball circulation, lubrication, and preload adjustment for long-term stable operation.

Slider Manufacturing Process

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Rails and sliders are paired and assembled.
SET products are matched and marked for traceability.
Products are checked for smooth movement, low friction, and accuracy.
Anti-rust oil is applied, and products are packaged safely.

Assembly Tips:

Wipe off anti-rust oil before installation.
Do not remove sliders unless necessary. Use proper clamping tools.
Do not mix non-interchangeable rails and sliders.

How-to-assembly-the-Linear-Guideway

assembly-the-Linear-Guideway

DLY linear guides are produced with strict control in every step:

Raw material inspection and storage
High-precision heat treatment and multi-stage straightening
Surface and groove grinding
Slider machining, assembly, and adjustment
Full inspection, marking, and packaging

This ensures high rigidity, high precision, smooth movement, and long service life. DLY linear guides are widely used in CNC machines, automation equipment, industrial robots, 3D printers, and semiconductor manufacturing. Choosing DLY means choosing a stable and reliable linear motion solution.