Label	Value
Material	customized
Drawing format	2D (PDF/CAD/DWG) and 3D (STEP/IGES/GLB)
Specification
Processing Precision	0.01mm
Production Capacity	100000/year
Process Usage
Surface Finish	Customized Finishing

Product Description

thing	describe
Design/Size	According to customer's drawings or samples
Material	Aluminum: 6061, 6063, 6082, 7075, 5052, A380, etc. Stainless steel: SS201, SS301, SS303, SS304, (SS304 food grade), SS316, SS316L, SUS430, SS416 Steel: low carbon steel, carbon steel, 4140, 4340, Q235, Q345B, 20#, 45#, etc. Alloy steel (15Cr, 20Cr, 42CrMo), etc. Brass: HPb63, HPb62, HPb61, HPb59, H59, H68, H80, H90, etc. Copper, bronze, copper, etc. Titanium: TC4 (TiAl6v4, Grade f5) Plastic: ABS, PC, PE, POM, Delrin, Nylon, Plastic, PP, PEI, Peek, etc.
process	CNC machining, turning, milling, stamping, turning, cutting, etc.
Delivery time	Samples usually take 3-7 working days, and mass production will be carried out according to the detailed quantity after sample approval.
Surface treatment	Transparent anodizing, color anodizing, chemical coating, brushing, passivation, polishing, chrome plating, sandblasting, laser engraving, zinc plating, black oxide, nickel plating, chrome plating, carburizing, heat treatment, painting
Test equipment	Coordinate measuring machine (CMM), 2D measuring instrument, projector, altimeter, micrometer, thread gauge, hardness tester, caliper, pin gauge, salt spray tester, concentricity measuring instrument, spectrometer.
Quality Management System	ISO 9001:2015 IATF 16949:2016 ISO 13485:2016
application	Auto parts, machinery parts, computer parts, medical parts, home appliance parts, electrical parts, electronic product parts, electronic parts, generator parts, alternator parts, generator parts, stationery, power switches, micro switches, construction, merchandise and A/V equipment.
File Format	Solidworks, Pro/Engineer, CAD, PDF, JPG, DXF, IGS
Package	Inner plastic bag, outer standard carton, or as per customer's requirements
Shipping	Sea freight, air freight, international express (DHL, FedEx, TNT, UPS).
Serve	The professional foreign trade team provides enthusiastic and fast response services. Dimensional inspection report/Raw material certificate/Surface treatment report/Engineering drawing RoHS report/Salt spray test report/Hardness test report

Custom Machining of BLDC Motor Rotor Core

This custom BLDC motor rotor core is a high-precision non-standard component, serving as the core transmission and magnetic conductive part of brushless DC motors. Its machining accuracy, surface quality and coating performance directly determine the operational stability, transmission efficiency and service life of the motor. Relying on our precision machining production line and mature non-standard component customization technology, our factory can realize the full-process precision machining of this rotor core from raw material forming to finished product electroplating, strictly complying with product design requirements and industrial application standards.

Core Product Features & Technical Requirements

The rotor core is made of high-quality national standard structural steel, featuring excellent mechanical strength and magnetic conductivity to meet the high-speed operation and power transmission needs of BLDC motors. The product has stringent core requirements for machining and surface treatment:

The rotor core surface must be free of rust, oil stains, scratches and appearance defects, with all edges deburred;
A precise-thickness chromium coating shall be applied on the surface, with the coating thickness controlled at 1-3μm. The coating must be uniform, with strong adhesion and free of peeling, pinholes and other defects;
All unspecified dimensions are machined in strict accordance with the 3D model, and key dimensions and geometric tolerances follow high-precision design standards;
The whole material complies with RoHS environmental protection requirements, and a certificate of compliance is provided for each shipment.

Full-Process Precision Machining Technology

In response to the machining requirements of this rotor core, our factory has formulated a standardized and refined full-process machining plan, with the core processes as follows:

Raw Material Cutting & Preprocessing

Select the corresponding national standard structural steel raw materials and achieve precise cutting with precision cutting equipment. Conduct oil and rust removal preprocessing on the raw material surface to ensure no impurities on the raw material substrate, laying a solid foundation for subsequent machining and electroplating.
Precision Forming Machining

Adopt high-precision machining equipment such as CNC turning and CNC milling to perform forming machining of core dimensions, chamfers, fillets, angles and other structures in accordance with the 3D model and design drawings. Complete precision machining of holes, slots and other features simultaneously. Realize closed-loop control of the CNC system throughout the process to ensure the consistency and accuracy of machined dimensions.
Deburring & Surface Finishing

Perform deburring on all machined edges in accordance with the 20x magnification inspection standard, and completely remove machining burrs and flash through a combination of mechanical deburring and manual finishing. Conduct subsequent surface finishing through grinding, polishing and other processes to ensure the product surface is free of scratches, bumps and other defects, meeting the clean surface requirements of no oil stains and no flaws.
Chromium Plating

As a core surface treatment process, use a professional electroplating production line for chromium coating preparation. First, perform activation treatment on the finished rotor core before electroplating to remove surface oxide layers and residual impurities. Then, realize uniform deposition of 1-3μm chromium coating through precise control of electroplating parameters. Conduct initial inspection after coating formation to ensure the coating thickness, adhesion and surface flatness meet the standards.
Full-Dimensional Inspection & Finished Product Acceptance

After electroplating, use high-precision testing equipment such as 2D and 3D measuring instruments to conduct full-dimensional inspection of product dimensions, geometric tolerances, angles, etc. Conduct special inspections on coating thickness, surface quality and rust condition simultaneously. Only products that meet all indicators can be put into storage, and inspection reports and RoHS compliance certificates are attached to each batch.

Key Machining Challenges & Targeted Solutions

This rotor core is a high-precision non-standard motor component, with multiple technical challenges in the machining process. Our factory has effectively overcome all challenges through mature process schemes and equipment technology, as detailed below:

Challenge 1: Stable Control of High-Precision Dimensions & Geometric Tolerances

The product has extremely high requirements for the machining accuracy of key dimensions, angles, fillets and other structures. Conventional machining is prone to dimensional deviation and geometric tolerance out-of-tolerance, affecting motor assembly and operational accuracy.

Solutions: Adopt imported high-precision CNC machining equipment with high-rigidity machine tool spindles and precision tool libraries to reduce errors caused by machining vibration; Calibrate equipment accuracy before machining, and adopt online testing technology during machining to monitor dimensional changes in real time and automatically compensate machining parameters; Implement the first-piece full inspection and patrol inspection system for batch machining to ensure the dimensional accuracy of each product meets design requirements.

Challenge 2: Achievement of High Standards for Flawless Surface

The product requires a surface free of rust, oil stains and scratches, with deburred edges. Conventional machining is prone to surface defects caused by cutting fluid residue, tool wear, fixture clamping, etc., affecting electroplating effect and product appearance.

Solutions: Select high-quality cutting fluid in the machining process and match with a high-pressure cooling system to reduce chip adhesion and surface scratches; Replace machining tools regularly to ensure tool sharpness and avoid burrs and surface roughness caused by tool wear; Wrap the fixture jaws with soft rubber pads for clamping to prevent surface indentation and scratches during clamping; Adopt ultrasonic cleaning process after deburring to completely remove surface oil stains and chip residue, and conduct vacuum drying after cleaning to prevent water stains and rust on the surface.

Challenge 3: Ensuring Uniform Deposition & Adhesion of 1-3μm Thin Chromium Coating

It is difficult to control the thickness of the thin chromium coating, which is prone to uneven thickness, poor adhesion, peeling and other problems. Coating quality directly affects the rust resistance and service durability of the rotor core.

Solutions: Customize special electroplating jigs to ensure uniform stress and consistent current distribution of the rotor core during electroplating, avoiding uneven coating thickness from the source; Optimize the pre-plating treatment process, and ensure no impurities on the workpiece surface through multiple processes such as degreasing, pickling and activation to improve the bonding force between the coating and the substrate; Precisely control key parameters such as electroplating bath concentration, temperature and current density, and adopt pulse electroplating technology to realize slow and uniform deposition of the coating, strictly controlling the coating thickness within the range of 1-3μm; Conduct coating adhesion test and thickness detection after electroplating, and reject unqualified coating products.

Challenge 4: Quality Consistency Control in Multi-Process Connection

The product involves multiple machining processes, and each link from raw materials to electroplating affects the final finished product quality. Quality fluctuations between processes are prone to occur in mass production.

Solutions: Establish a full-process quality traceability system, assign a unique traceability code to each product, and record the machining parameters, test results and operators of each process; Set up exclusive quality inspection posts for each process, and unqualified products from the previous process are strictly prohibited from entering the next process; Regularly maintain, service and calibrate the machining and electroplating equipment, and conduct professional skill training for operators to ensure the standardization and normalization of operations in each process.

Our Machining Advantages

Strong Non-Standard Customization Capability

With in-depth experience in the field of precision machinery non-standard custom machining, we can flexibly adjust machining processes according to customers' 3D models and drawing requirements, adapting to the customization needs of various core components of BLDC motors.
Advanced Equipment & Technology

Equipped with a full set of high-precision CNC machining equipment, professional electroplating production lines and precision testing instruments, our process schemes have been verified through multiple practical applications, enabling stable achievement of machining requirements for high precision and high surface quality.
Strict Quality Control

Establish a full-process quality control system from raw material incoming inspection to finished product delivery. All products undergo multiple testing processes to ensure product qualification rate, and inspection reports and compliance certificates are provided for each shipment.
One-Stop Full-Process Service

We can provide one-stop services from raw material procurement, precision machining, surface electroplating to finished product inspection, packaging and delivery, reducing customer connection links and improving customization efficiency.

With customer needs at the core and precision machining technology as the support, our factory strictly controls every production link to ensure providing customers with BLDC motor rotor core products that meet design standards and have stable quality, adapting to various industrial BLDC motor application scenarios.

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BLDC Rotor Core | Custom Precision Machining & Chromium Plating

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