چرخ فولادی از نوع EP-Tube - مشخصات چرخ کامیون‌های سنگین

2. Five Key Product Advantages

3. How It Works — Manufacturing and Assembly of a Tube Type Truck Wheel

The production of a reliable Tube Type Steel Wheel for heavy truck applications begins with material verification at the incoming dock. Each steel coil undergoes X-ray fluorescence (XRF) elemental analysis and tensile coupon testing to confirm that alloy composition and mechanical properties conform to the specification for that order. This step is not a formality — variability in incoming steel chemistry is one of the root causes of inconsistent wheel fatigue performance in the aftermarket, and the deliberate quality gate at material receipt is what separates a traceable product from an untraceable one. Once material is released, the rim strip is cut to length and fed into the rim-forming line.

The rim body is formed through a progressive roll-forming process: a flat steel strip is passed through a series of driven forming rolls that progressively shape the material into the complex cross-section of the 20-inch or 24-inch heavy چرخ کامیون rim profile. For tube type rims, the profile must include a precisely shaped well region that accommodates the folded inner tube during mounting, flanges with a radius and angle controlled to the applicable GB or ISO standard, and bead seats with the correct taper for the tire cross-section. The rim ends are then upset-welded to form a continuous ring, and the weld area is trimmed and expanded to the final diameter tolerance in a separate sizing operation. Any out-of-round or out-of-diameter units are automatically rejected at this stage.

The disc — the flat or dished steel component that connects the rim to the axle hub — is deep-drawn from a steel blank in a multi-stage progressive die set. The bolt holes are punched and then finish-drilled to the specified diameter (26, 27, 32, or 32.5 mm depending on the model) with center-to-center pitch tolerance controlled to ±0.2 mm. The stud hole profile — SR22 spherical, rightangle flat, or 45-degree taper — is machined as a secondary operation to ensure that the lug nut seating geometry is accurate enough to produce uniform clamping force at the specified truck wheel lug nut torque across all bolt positions. Disc to rim assembly is performed by robotic MIG welding under programmed amperage and travel speed parameters that guarantee full joint penetration. The weld seam is then subjected to a 100% air pressure leak test, after which the assembled چرخ کامیون moves to the dynamic balance and dimensional inspection station. Units passing all checks proceed to the paint line; units failing any check are quarantined and scrapped.

The paint process begins with a mechanical shot blast to Sa 2.5 surface cleanliness, removing all mill scale, weld spatter, and surface contamination before primer application. Epoxy primer is applied electrostatically at 40–60 µm DFT, followed by a polyester or polyurethane topcoat at 60–80 µm. The cured coating withstands ≥480 hours of neutral salt spray testing — important assurance for Colombian fleet operators whose heavy duty truck wheel and tire assemblies must survive the full range of Colombian road environments throughout a multi-year service cycle.

4. Material Composition

The structural performance of any چرخ کامیون over a 300,000–500,000 km service life is determined first by material choice, then by forming process, and finally by weld quality. This series addresses all three through a disciplined approach to each stage. The rim shell and disc are produced from SPFH590 hot-rolled high-strength steel — a grade with a minimum yield strength of 440 MPa and ultimate tensile strength of 590–730 MPa. The elevated yield point is what prevents the rim flange from permanently deforming after a pothole impact or kerb strike, which is the most common mode of tube type چرخ کامیون service damage on Colombia’s secondary and tertiary road network. The 18% minimum elongation at fracture is what gives the material enough ductility to survive the deep-drawing operations required to form the disc profile without developing forming cracks at tight-radius features around the bolt hole annulus.

For specific models in the series where mass reduction is a priority — particularly for vehicles operating near their legal Colombian gross vehicle weight limit under Resolución 4100 de 2004 — DP600 dual-phase steel is used in the disc pressing. DP600’s dual-phase microstructure (hard martensite islands in a soft ferrite matrix) gives it a higher specific strength than conventional carbon steel, allowing a slightly thinner disc section to carry the same cyclic load. The net effect on a typical heavy duty truck wheel is a mass reduction of 10–15% per disc compared to a standard carbon steel equivalent — directly beneficial to payload capacity on the axle positions where this چرخ کامیون is mounted. Over an entire three-axle truck configuration, the cumulative weight saving can approach 30–40 kg, which translates to additional legal payload capacity under Colombian axle load enforcement.

The corrosion protection system is engineered for the full environmental range this Tube Type Steel Wheel may encounter in Colombian fleet service: tropical humidity at coastal ports, aggressive road surface contamination on Andean freight corridors, and diesel and acidic tire residue accumulation on urban distribution routes. Shot blasting to Sa 2.5 (ISO 8501-1) creates a surface cleanliness and profile that maximizes epoxy primer adhesion. The primer and topcoat system cures to a total DFT of 100–140 µm, providing a durable corrosion barrier that has been validated to ISO 9227 neutral salt spray test protocol for ≥480 hours before corrosion breakthrough — a standard that reflects realistic long-term fleet service conditions rather than just factory-exit condition.

۵. سناریوهای کاربردی

6. Regulatory Compliance & Industry Standards

Colombia — Ministerio de Transporte

In Colombia, commercial vehicle technical standards for heavy trucks and their components are administered by the Ministerio de Transporte through Resolución 4100 de 2004 (Pesos y Dimensiones), which sets per-axle load limits enforced by INVIAS at weighbridge stations across the national road network. Importers of replacement wheels must provide technical datasheets, material certificates, and load rating documentation through their customs declarations at Colombian ports of entry. Colombian NTC (Norma Técnica Colombiana) quality framework expectations for imported commercial vehicle components align broadly with ISO quality management system requirements. This چرخ کامیون series is produced under an ISO 9001:2015-certified quality management system and is supported by material test certificates and third-party test reports (SGS, TÜV, BV) on request — documentation that supports Colombian customs clearance and satisfies fleet operator quality audit requirements. Colombian buyers can obtain Spanish-language technical datasheets and Certificate of Origin documentation for customs purposes as standard.

China — GB/T Standards

This Tube Type Steel Wheel series is designed and tested in compliance with GB/T 5909 (bending fatigue testing for commercial vehicle wheels) and GB/T 15623 (dynamic cornering fatigue testing). These national standards define the test protocols, load factors, and acceptance criteria for heavy truck wheels sold in the domestic market, and they align with the intent of the SAE J267 and SAE J328 international standards. The compliance with GB/T standards provides a documented technical baseline for Colombian buyers who need to evaluate supplier quality against a recognized standard rather than on the basis of unverified manufacturer claims.

United States — FMCSA Requirements

For Colombian importers who also operate or supply in the North American freight market, the Federal Motor Carrier Safety Administration (FMCSA) under 49 CFR Part 393 requires that commercial vehicle wheels be free from cracks, elongated bolt holes, and missing fasteners, and that wheel replacement records be maintained for compliance audit. The traceability documentation available for this چرخ کامیون series — including batch-level material test certificates and dimensional inspection records — supports FMCSA compliance recordkeeping requirements for vehicles operating under US Motor Carrier authority.

European Union — ECE and ETRTO Standards

While this Tube Type Steel Wheel series is primarily specified for Asian heavy truck platforms, the broader product range from which it originates includes European-format wheels tested to ECE R-124. For Colombian fleet operators managing a mixed fleet including European-origin trucks (Volvo, Mercedes-Benz, MAN), companion products covering European platform specifications are available from the same product family, supporting the one-stop supply model for mixed-fleet operators. The ISO 9001:2015-based quality management system ensures that the manufacturing discipline is consistent across all product lines, regardless of the target market standard.

۷. درباره ما

Our manufacturing infrastructure covers seven dedicated production bases and one complete wheel and tire assembly facility distributed across multiple production locations. The high-end factory facility operates four production lines at a combined annual capacity of six million pieces, drawing on equipment sourced from Germany, Sweden, Spain, Japan, and the United States. All pressing, welding, and material handling is performed by industrial robots, and every production station is equipped with 100% inline inspection — not sample-based statistical control, but individual unit verification at every critical stage. This manufacturing philosophy is why we are among the first companies in our industry to receive National Export Base of Auto Parts designation from the National Commerce Department.

The National-Level Testing Center underpins everything. Equipped with German RMS cornering fatigue test rigs, US ITS radial fatigue machines, CMM coordinate measuring systems, salt spray chambers, UV aging ovens, and XRF material analyzers, the center performs the full spectrum of wheel qualification tests on a routine basis.

کارگاه

8. Related Products — Complete Axle-End System Supply

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