High-precision brass bushing trustworthy CNC machined mechanical equipment parts

CNC machining of brass bushings is a prime example of precision manufacturing for easily machinable non-ferrous metals. Brass (such as HPb59-1 and C3600) is an ideal material for manufacturing bearings, bushings, and precision valves due to its excellent thermal conductivity, self-lubricating properties, and outstanding machinability. While the core of the machining process seems simple, it actually faces challenges such as the material's softness and susceptibility to scratches, the tendency of thin-walled parts with large length-to-diameter ratios to deform, and extremely high requirements for internal hole dimensions and surface finish. The core of the process lies in how to transform the material's easy-to-machinable advantages into precision products with dimensional stability, perfect surfaces, and no damage.

What are the characteristics of CNC machining of brass bushing?

I. Damage-Prevention-Oriented Refined Planning

First, the length-to-diameter ratio and wall thickness of the bushing are analyzed to predict its deformation risk under clamping and cutting forces. The core is to design a mark-free clamping solution: a dedicated non-metallic fixture that ensures rigidity while avoiding any clamping marks on the workpiece surface. For tool selection, uncoated or diamond-coated carbide tools with extremely sharp cutting edges, large rake angles, and smooth chip flutes must be used to ensure smooth, burr-free cutting and prevent material sticking to the tool due to edge wear. CNC programming must design smooth toolpaths, avoid abrupt changes in direction, and allocate reasonable machining allowances for subsequent critical processes.

High-precision brass bushings CNC machined mechanical equipment parts

II. Smooth Cutting and Staged Forming

This is the stage where high efficiency and precision are achieved by fully utilizing the properties of brass bushing, typically completed on a precision CNC lathe or mill-turn center.

Datum Establishment and Efficient Roughing: First, finish turn one end face and outer diameter to establish a precise datum. Roughing can boldly employ a combination of high speed, large depth of cut, and rapid feed rate to efficiently remove excess material, similar to handling valuable wood, while maintaining smooth cutting to allow heat to be quickly carried away by the chips. At this stage, chip breaking control is crucial, requiring adjustment of the feed or the use of chip breaker inserts to prevent continuous ribbon-like chips from entangled in the workpiece.

1) Semi-finishing and Precision Pre-control: After roughing, minor deformations that may be caused by cutting forces are corrected. Semi-finishing aims for uniform allowance, creating ideal conditions for finishing.

2) Finishing and Mirror Finish: This is the decisive step in ensuring final performance. A brand-new precision turning tool is used, with extremely high speeds and finely dressed feed rates for final shaping. For high-precision internal holes, a single-edged precision boring tool can be used for micro-cutting, combined with appropriate cooling, to directly obtain a mirror-like surface (Ra value below 0.4μm), meeting the requirements of hydraulic or precision fits.

III. Stress-Free Delivery and Perfect Finish

The post-machining treatment directly determines the function and appearance quality of the bushing.

1) Non-destructive Cutting and Fine Deburring: When cutting the workpiece from the bar stock, a sharp cutting tool must be used with optimized parameters to prevent stretching that could cause end deformation. Subsequently, comprehensive and thorough fine deburring must be performed, especially at the edges of the internal hole and the intersection of oil grooves, to ensure no metal particles remain.

2) Cleaning and Protection: Use ultrasonic cleaning equipment to thoroughly remove grease and copper shavings from the inside and outside of the workpiece. Sincebrass bushings is prone to oxidation, it must be dried immediately after cleaning, and precision surfaces should undergo anti-oxidation treatment to maintain its original metallic luster.

3) Precision Inspection: Under constant temperature conditions, use high-precision measuring tools such as pneumatic micrometers and plug gauges to focus on inspecting the dimensional consistency, cylindricity, and roundness of the inner holes. Simultaneously, use a roughness tester to check the surface finish of key surfaces to ensure complete compliance with drawing requirements.

Company Profile

         We are a manufacturer integrating industry and trade. We have more than 20 years of experience in production technology. We are located in Dongguan City, Guangdong Province, China. We have advanced high-end professional production and processing technology, and are committed to innovative R&D and production. After years of market tempering and exploration, it has high-quality technical management personnel, experienced designers, R&D personnel and a perfect company management system.

5-axis CNC workshop

         Our factory has a plant area of about 2,000 square meters and masters core processing technologies. It has high-end precision production equipment: CNC lathes, 5-axis CNC, 4-axis CNC, stamping equipment, die-casting equipment, etc.​

Auxiliary production equipment: electroplating, anodizing, hard anodizing and surface treatment. We have complete testing equipment: sophisticated three-dimensional testing, two-dimensional testing, hardness tester, height meter, projector and other conventional testing equipment. If you are interested in our products, please contact me and I will provide the best price support and quality service.

2D inspection equipment

Product Packaging

Packaging Details

1. Commercial packaging: 1pc/plastic bag + color box +carton + pallet;
2. Industrial packaging: (1). plastic tube + carton + pallet; (2). plastic bag + kraft paper + carton + pallet;
3. According to the requirement of customer.