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UPPER AND LOWER HOUSING OF MARINE GEARBOX UPPER AND LOWER HOUSING 1

UPPER AND LOWER HOUSING OF MARINE GEARBOX UPPER AND LOWER HOUSING 2

UPPER AND LOWER HOUSING OF MARINE GEARBOX UPPER AND LOWER HOUSING 3

UPPER AND LOWER HOUSING OF MARINE GEARBOX UPPER AND LOWER HOUSING

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Specification

Item	Description	Parameters
01	Tooth profile accuracy	Grade 6 or higher ISO1328 or AGMA standard
02	Tooth direction accuracy	≦0.01mm
03	Pitch accuracy	±0.005mm
04	Surface roughness	Ra≤0.8μm
05	Module	2-14 mm
06	Number of Teeth	as per gearbox ratio and design
07	Pressure Angle	20°

Features

Material

The gearbox housing for marine applications is typically made of the following materials:

- Cast Iron:

- HT250, HT300: High-strength gray cast iron, offering good casting performance, vibration damping, and wear resistance, suitable for small and medium-sized gearboxes.

- QT400-18, QT450-10: Ductile cast iron, providing higher strength and toughness, suitable for medium and large-sized gearboxes.

- Cast Steel:

-ZG230-450, ZG270-500: Cast steel material, high strength, suitable for bearing large loads and impact gearboxes.

- Aluminum Alloy:

- ZL101, ZL104: Lightweight materials, suitable for small or high-speed gearboxes, offering good corrosion resistance and heat dissipation.

Heat treatment

Heat treatment aims to improve the mechanical properties and durability of the housing. Common processes include:

- Annealing:

- Eliminates casting stress and improves organizational uniformity, suitable for cast iron and cast steel housings.

- Normalizing:

- Enhances the strength and hardness of cast steel housings and improves machinability.

- Aging Treatment:

- Suitable for aluminum alloy housings, eliminates internal stress, and improves dimensional stability.

- Surface Treatment:

- Shot blasting: Improves surface hardness and fatigue resistance.

- Phosphating: Enhances corrosion resistance and lubricity.

Processing

The machining processes directly affect the dimensional accuracy and assembly performance of the housing. The main steps include:

1. Casting:

- Sand casting or precision casting is used to ensure the shape and dimensions of the housing meet design requirements.

2. Rough Machining:

- Rough milling and boring of the casting blank to remove excess material and leave machining allowances.

3. Heat Treatment:

- Annealing, normalizing, or aging treatment is performed based on the material to eliminate internal stress and improve mechanical properties.

4. Semi-Finishing:

- Semi-finish machining of mounting surfaces and bearing holes to ensure dimensional and geometric tolerances.

5. Finishing:

- Precision milling and boring of critical areas (e.g., bearing holes, sealing surfaces) to ensure dimensional accuracy and surface roughness.

6. Surface Treatment:

- Shot peening, phosphating, or coating is applied to improve corrosion resistance and appearance.

7. Inspection:

- Includes dimensional inspection, hardness testing, and non-destructive testing to ensure housing quality meets requirements.

FAQ

What material is usually used for marine gearbox driving gear?

Commonly used materials include high-strength alloy steels such as 20CrMnTi, 18Cr2Ni4WA and 42CrMo. These materials have high strength, good toughness and wear resistance, and are suitable to withstand high loads and impacts.

What are the heat treatment processes of the driving gear?

The main heat treatment processes include: - Carburizing hardening: improve the surface hardness and wear resistance, the surface hardness can reach HRC58-62 with core hardness HRC30-40. - Tempering: eliminate internal stress and improve toughness. - Nitriding treatment: further improve the surface hardness and wear resistance, suitable for high-speed, heavy duty conditions.

What steps does the machining process of the driving gear include?

The processing technology mainly includes: - Forging: Ensure material density and fiber flow. - Roughing: preliminary forming, leaving a margin for finishing. - Finishing: Using high precision CNC machine tools for tooth shape machining. - Grinding teeth: improve tooth shape accuracy and surface quality. - Inspection: Use coordinate measuring machine and gear inspection center to ensure accuracy.

What is the accuracy requirement of the driving gear?

Accuracy requirements include: -Tooth profile accuracy: According to ISO1328 or AGMA standard, usually DIN grade 6 or higher. -Alignment accuracy: The error is controlled within 0.01mm. -Pitch accuracy: The error is controlled within ±0.005mm. -Surface roughness: Ra≤0.8μm

What are the main dimensions of the driving gear?

The main size parameters include: -Module: Usually 2-14mm. -Number of Teeth: Designed according to gearbox ratio. -Pressure Angle: Usually 20°. -Tooth Width (Face Width): common 50-150mm. -Outer Diameter: calculated according to the modulus and number of teeth. Bore Diameter: Fit with shaft, usually 50-200mm.

What are the geometric tolerance requirements for the drive gear?

Geometric tolerances include: -Concentricity: Control within 0.01mm. -Parallelism: Control within 0.02mm. -verticality: Control within 0.01mm.

How to check the accuracy and quality of the driving gear?

Detection methods include: -Coordinate measurement machine: Detect geometric dimensions and form and position tolerances. -Gear detection center: detection of tooth shape, tooth direction and tooth pitch accuracy. -Hardness test: Test surface and core hardness. -Surface roughness detection: Ensure that the tooth surface roughness meets the requirements.

What is the quality control standard for driving gear?

Quality control follows international standards (such as ISO, AGMA) or industry specifications to ensure that the dimensional accuracy, hardness, surface quality and mechanical properties of the gear meet the design requirements.

What are the application scenarios of Marine gearbox driving gear?

The driving gear is widely used in Marine propulsion systems, lifting equipment, construction machinery and other occasions requiring high load and high reliability.

How to maintain the drive gear to extend its service life?

Maintenance measures include: -Check gear meshing and surface wear regularly. -Keep the lubrication system working properly and use suitable lubricating oil. -Avoid overload operation and ensure that the gear works within the rated load.

What is the design life of the driving gear?

The design life is usually 10-20 years, depending on working conditions, load and maintenance.

How to choose the right driving gear supplier?

The following factors should be considered when selecting a supplier: -Technical competence and experience of the supplier. - Quality control system and certification (e.g. ISO/IATF16949, ISO9001). - After-sales service and technical support capabilities.

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