Boxin · Hengzhen · Botrust
Precision Manufacturing・Powering the World
MIM
This component is a precision stainless steel transmission sleeve/splined shaft sleeve manufactured using the MIM metal powder injection molding process. It features an integral one-piece design, with external splines, a specially shaped internal bore, and end-face locating grooves, offering high precision, high strength, and excellent wear and corrosion resistance. It is primarily used in the drive systems of small machinery, power tools, or smart home devices to transmit torque, connect shafts, and provide circumferential positioning.
- Product Description
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I. Basic Product Information
- Product Name MIM stainless steel precision transmission sleeve / spline shaft sleeve
- Manufacturing process Metal Injection Molding (MIM)
- Material : Stainless steel (customizable alloy steel and other alloy materials)
- Core Use : As a torque-transmitting component in the drivetrain, or as an axle‑type coupling sleeve or locating sleeve, it is used in power tools, smart home devices, and small industrial machinery to facilitate power transmission, inter‑axial connection, and circumferential positioning.
II. Structure and Process Details
- Appearance and Structural Features
- The component features an integrally molded cylindrical structure, with external splines at one end that engage with a mating gear or splined shaft to transmit torque. The tooth profile is clear and well‑defined, the meshing clearance is uniform, and the transmission operates smoothly with low noise.
- It features a uniquely shaped internal bore that mates precisely with the drive or driven shaft, providing circumferential locking without the need for additional keyway machining, thereby enhancing assembly efficiency.
- The other end is equipped with an end-face locating groove, which can mate with the equipment housing or other components to provide axial positioning, preventing axial movement of the sleeve while also serving as a lock‑down feature.
- MIM Process Advantages Are Evident
- One-step forming of complex structures: features such as external splines, irregular internal bores, and end-face locating grooves eliminate the need for secondary machining, being directly produced via molding. Dimensional accuracy can reach ±0.05 mm, with high inter‑part fit consistency and no additional rework required.
- Outstanding material performance: The sintered stainless steel exhibits high density, free of porosity and shrinkage defects. Following heat treatment, it achieves a uniform hardness distribution, combining the wear resistance of spline teeth with overall structural strength, making it well-suited for high-torque, high‑frequency transmission applications.
- Strong surface‑condition compatibility: Surface treatments such as polishing and hard chrome plating can be applied as needed to enhance the wear resistance and corrosion resistance of spline teeth, making them suitable for humid or high‑load operating environments.
- Cost and Efficiency Advantages: Near-net-shape forming significantly reduces subsequent machining, achieves high material utilization, and is well-suited for mass production, thereby effectively lowering the per-unit cost.
- Performance Features
- High transmission efficiency: The spline teeth and mating components have a large contact area, resulting in high transmission efficiency, minimal power loss, and effective torque transmission that meets the power requirements of the equipment.
- Wear and fatigue resistance: After densification treatment of the spline tooth surfaces, the material exhibits excellent wear resistance, can withstand high‑frequency meshing and transmission, boasts a long service life, and is less prone to surface wear and tooth chipping.
- Structural stability and reliability: The monolithic, integrally molded structure features no welded joints, ensuring uniform load distribution throughout. It can withstand the vibrations and impact loads generated during equipment operation, remaining resistant to deformation and fracture over long-term use.
- Wide customization and adaptability: Parameters such as spline tooth count and module, inner bore shape and dimensions, and end-face positioning structure can be tailored to meet customer requirements, ensuring compatibility with varying equipment transmission ratios, installation space constraints, and torque demands.
III. Application Scenarios
It is widely used in applications such as drive sleeves for power tools, motor shaft sleeves for smart home devices, and spline‑type coupling sleeves for small industrial machinery, making it particularly well suited to precision transmission fields that demand high component transmission accuracy, wear resistance, corrosion resistance, and consistent batch-to-batch performance.
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