The Hydraulic Breaker Chisel Housing is a critical structural component in hydraulic breaker systems, designed to encase and guide the chisel (moil point) during high-impact demolition and rock-breaking operations. This housing must withstand extreme cyclic impact loads, abrasive dust environments, and continuous vibration while maintaining precise alignment of internal components.
Ningbo Ruican manufactures this housing using precision Investment Casting (lost wax process) followed by multi-axis CNC MACHINING, ensuring exceptional dimensional accuracy, superior surface finish, and consistent metallurgical integrity. Our integrated casting-plus-machining approach eliminates the need for multiple suppliers, reducing lead times and quality variability.
Material Specifications
| Parameter | Specification |
|---|
| Material | 42CrMo4 (AISI 4140) alloy steel |
| Tensile Strength | ≥ 980 MPa |
| Yield Strength | ≥ 785 MPa |
| Elongation | ≥ 12% |
| Impact Toughness | ≥ 63 J (at -20°C) |
| Hardness | 28–34 HRC (quenched & tempered) |
| Heat Treatment | Quench at 850°C + Temper at 560°C |
Casting Specifications
| Parameter | Specification |
|---|
| Casting Process | Silica sol investment casting |
| Dimensional Tolerance | ISO 8062 CT5–CT7 |
| Surface Roughness | Ra 3.2–6.3 μm (as-cast); Ra 1.6 μm (machined) |
| Weight Range | 8–35 kg |
| Wall Thickness | 8–25 mm |
| Machining Allowance | 1–3 mm per surface |
CNC Machining Parameters
| Parameter | Specification |
|---|
| Machining Tolerance | ±0.02 mm (precision bores); ±0.05 mm (general) |
| Machined Surfaces | Internal bore, guide groove, mounting flange, pin hole |
| Surface Treatment | Nitriding (0.3–0.5 mm depth) or hard chrome plating |
| Bore Finish | Honed to Ra 0.8 μm |
| Parallelism | ≤ 0.03 mm |
| Perpendicularity | ≤ 0.05 mm |
Quality Control
- 100% dimensional inspection with CMM (Coordinate Measuring Machine)
- Ultrasonic testing (UT) for internal defect detection
- Magnetic particle inspection (MPI) for surface cracks
- Hardness testing on every batch (HRC verification)
- Material certification with heat/lot traceability per EN 10204 3.1
Applications
- Hydraulic breakers for excavators (1.5–50 ton class)
- Demolition hammers for construction sites
- Quarry and mining rock-breaking operations
- Road construction and concrete breaking
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