Inner Diameter Honing and Centerless Grinding of Seamless Steel Tubes｜Surface Roughness Control Compliant with JIS Standards for Hydraulic and Cylinder Components

FUSOH TUBE PARTS (THAILAND) CO., LTD. provides contract inner diameter honing and centerless grinding services for seamless steel tubes in Thailand. We handle various types of steel tubes, including carbon steel tubes for machine structural purposes, and support a wide range of production volumes from small lots to mass production.

Table of Contents

• Integrated In-House System from Material Procurement to Processing and Inspection in Thailand
• Processing Specifications for Inner Diameter Honing and Centerless Grinding
• Quality Control Using a Coordinate Measuring Machine (CMM) and Traceability System
• Prototype Support and Order / Consultation Process
• Specifications of Major Processing Equipment and Inspection Devices
• Frequently Asked Questions (FAQ)

■　Integrated In-House System from Material Procurement to Processing and Inspection in Thailand

When procuring critical components such as hydraulic cylinders and high-pressure piping parts at manufacturing sites in Thailand, involving multiple processing suppliers can create issues such as the risk of dents during transportation and increased complexity in quality control.

FUSOH TUBE PARTS (THAILAND) CO., LTD. operates a factory and warehouse in Chonburi Province, Thailand, and maintains a large in-house inventory of seamless steel tubes for machine structural use. In addition, we handle the entire process in-house, from material cutting to inner diameter finishing using honing machines, outer diameter centerless grinding, and quality inspection.

By linking all processes from material procurement through final processing and inspection within our own facilities, we can reduce the risk of dents and scratches during product movement between processes and directly link and manage quality data for each process.

This reduces the workload of purchasing departments that would otherwise need to coordinate with multiple processing companies, while also reducing transportation lead times and transportation costs and suppressing quality variation. We support the stable procurement of hydraulic components requiring high reliability within Thailand.

■　Processing Specifications for Inner Diameter Honing and Centerless Grinding

Precision components such as hydraulic cylinders for construction machinery and agricultural machinery, shafts, and bushes require high concentricity and strict surface roughness. Therefore, securing a processing supplier in Thailand that can provide stable finishing accuracy is important.

For inner diameter finishing, we use a CHISHIMA HO machine honing machine, while for precision outer diameter finishing, we use MICRON 8.0T and JAINNHER JHI-150CNC centerless grinding machines. After processing, products are measured and verified using a coordinate measuring machine for dimensional tolerances and surface characteristics according to drawing specifications.

By precisely managing both inner diameter finishing using dedicated honing machines and outer diameter finishing using centerless grinding machines within the same factory, we can maintain the inner surface roughness and roundness required for the sliding sections of hydraulic cylinders with a high level of repeatability.

For local procurement in Thailand, customers can obtain high-precision finished components with equivalent specifications, short lead times, and stable quality levels without relying on imports from Japan.

■　Quality Control Using a Coordinate Measuring Machine (CMM) and Traceability System

For critical components used in automobiles and construction machinery, a traceability system that can prove the absence of material defects and enable tracking investigations when problems occur is essential.

We strictly manage the mill sheets of seamless steel tubes procured directly from steel manufacturers. We have also established a traceability system based on lot management covering the entire process from material cutting, intermediate processing, measurement, packaging, and shipment.

Because all manufacturing histories and raw material certificates are linked and managed by lot number, the material certification of procured seamless steel tubes is clearly maintained. In the event of a quality issue, the cause can be quickly investigated and the scope of impact can be identified.

We comply with the strict quality assurance standards required by finished vehicle manufacturers and major agricultural and construction machinery manufacturers, and also contribute to reducing the burden of audits and quality explanations for end users.

■　Prototype Support and Order / Consultation Process

During the prototype development stage toward mass production, it is important to respond quickly to prototype production locally and verify at an early stage whether the dimensional tolerances and specification requirements in the drawings can be met.

In addition to prototypes intended for mass production, we also accept consultations for single-piece and small-lot processing. Based on the know-how of our Japan operations, engineers who can communicate in Japanese and Thai serve as the direct point of contact, accurately confirm the technical requirements in the drawings, and then review processing feasibility and improvement proposals.

Detailed specification requirements, including surface roughness control compliant with JIS standards and various geometric tolerances, can also be discussed directly with the local factory. This helps prevent technical misunderstandings and enables prompt responses to requests for revisions.

This helps prevent time loss caused by temporary return shipments to Japan or confirmation work, and contributes to shortening development lead times in Thailand.

※For more details, please download the materials or contact us via the form below.

■　Specifications of Major Processing Equipment and Inspection Devices

■　Frequently Asked Questions (FAQ)

Q1. : Can you provide honing and centerless grinding for prototypes, single-piece orders, and small-lot orders?
A1. : Yes, we can. FUSOH TUBE PARTS (THAILAND) CO., LTD. has a system in place to support everything from small-lot production such as prototypes and single-piece orders to mass production supply for automotive, construction machinery, and agricultural machinery components.

Q2. : Can you also handle procurement of the seamless steel tubes used for processing, starting from material sourcing?
A2. : Yes, we can. We maintain an in-house inventory of seamless steel tubes for machine structural use, such as STKM, at our warehouse in Thailand, and handle the entire process in-house from material arrangement and cutting to inner diameter honing, centerless grinding, and final inspection. This reduces the burden of placing orders with separate suppliers and reduces transportation costs between processes.

Q3. : How are the quality control system and certification of inspection results handled?
A3. : We strictly implement traceability through lot management from the material mill sheet through shipment of the final product. For dimensional and shape measurements, we use measuring equipment such as coordinate measuring machines and conduct inspections based on drawing specifications.

※For more details, please download the materials or contact us via the form below.