When it comes to mining and earthmoving equipment, reliability and durability are paramount. CNC customized forging and turning of SAE 4140 (42CrMo) steel provides the ideal solution for these demanding applications.

SAE 4140 (42CrMo) steel is a high-strength, low-alloy steel that offers excellent wear resistance and fatigue strength. Its mechanical properties, such as tensile strength and yield strength, make it an ideal choice for components that are subject to heavy loads and frequent use.

CNC forging is a precision manufacturing process that uses computer numerical control (CNC) machines to shape metal into complex parts. This process ensures precise dimensions and tolerances, resulting in components that fit tog perfectly and function reliably.

CNC turning is a subtractive manufacturing process that involves removing material from a workpiece to create the desired shape. It is often used to finish parts after forging, ensuring smooth surfaces and tight tolerances.

In mining and earthmoving applications, CNC customized forging and turning of SAE 4140 (42CrMo) steel can be used to create a variety of components, including gears, shafts, bearings, and other moving parts. These parts are subjected to extreme conditions, such as high temperatures, abrasion, and impact, but SAE 4140 (42CrMo) steel's durability and strength allow them to perform reliably over long periods of time.

In conclusion, CNC customized forging and turning of SAE 4140 (42CrMo) steel is an excellent choice for mining and earthmoving applications. It ensures precise dimensions and tolerances, while the steel's mechanical properties provide the durability and strength needed to handle the rigorous demands of these applications.

Valve Bushing

VIIPLUS engineering team provides CNC milling service for customers worldwide. Drawing and sample precision machining OEM SAE4140 42CrMo High Precision CNC Bushing Custom Forging Turning 42crmo Steel Mining & Earthmoving Parts

Drilling, Etching / Chemical Machining, Laser Machining...non standard parts

We offers comprehensive CNC milling services for the machining of various parts. Our CNC milling centers are outfitted with the latest tooling equipment and are operated by a number of experienced machinists, allowing us to produce parts that strictly conform to customer design requirements and specifications.
- We have experience in working with a diverse range of materials, including steel, aluminum, brass, titanium and plastics.

- We are capable of handling both short prototype runs and high volume production runs.
- We further ensure quality by using the latest state-of-the-art inspection equipment.

Features

Alloy Bushings

Overview

Overview

What is four-axis CNC machining.

CNC is the abbreviation of numerical control, also known as computer gong, is a program controlled automatic machine tool.The control system can logically process the program with control code or other symbolic instructions, and then decode it through the computer, so that the machine tool can perform the specified action, and the blank material can be processed into semi-finished parts through the cutting tool.CNC machining is a new processing technology, the main work is the preparation of processing procedures, will be the original manual work into computer programming.

Composition of CNC system:

The CNC system consists of "CNC device", "servo system" and system program.
Numerical control device (special computer): hardware and software components.
Servo system: detection device, drive device and servo motor composition.
Four axis CNC processing plant share the following advantages of CNC processing:
(1) a large number of reduce the number of tooling, machining complex shape parts do not need complex tooling.If you want to change the shape and size of the parts, only need to modify the parts processing procedures, suitable for new product development and modification.
(2) the processing quality is stable, the processing accuracy is high, the repetition accuracy is high, adapt to the aircraft processing requirements.
(3) a variety of small batch production, production efficiency is higher, can reduce the production preparation, machine adjustment and process inspection time, and because of the use of cutting time and reduce the cutting time.
(4) can be processed conventional methods difficult to process complex surface, even can process some of the processing parts that cannot be observed.
Although it has been claimed that centrifugally cast bushings outlast Forging Turning bushings, many users who have tried these bushings have found that no other combination will outlast ours. Our original forged steel bushings have already proven to outlast any cast, centrifugally cast, or combination of either.
In addition to our CNC PINS AND BUSHING, VIIPLUS created a new line of Forged Steel Bushings for CNC industry.

SPECIFICATIONS

CNC BUSHINGS:Standard Yield Strength

Material :

SAE4140 has high strength, high hardenability, good toughness, small deformation during quenching, high creep strength and long-lasting strength at high temperatures. Forgings requiring higher strength and larger quenching section than 35CrMo steel, such as large gears for locomotive traction, supercharger transmission gears, rear axles, extremely loaded connecting rods and spring clips, can also be used Oil deep well drill pipe joints and fishing tools below 2000m.

Executive Standard: ASTM A29/A29M-04

Features:

SAE4140 steel, this steel has good processability, small processing deformation, and good fatigue resistance. It is a medium-hardened steel. After 4140 heat treatment, it has good strength and good comprehensive mechanical properties, good manufacturability and finished product rate. high. The maximum operating temperature is 427 degrees Celsius. 4140 high strength, high hardenability, good toughness, small deformation during quenching, high creep strength and long-lasting strength at high temperatures. Forgings requiring higher strength and larger quenching section than 35CrMo steel, such as large gears for locomotive traction, supercharger transmission gears, rear axles, extremely loaded connecting rods and spring clips, can also be used Oil deep well drill pipe joints and fishing tools below 2000m, and can be used for molds of bending machines, etc.

chemical composition:

Region: China

Standard: GB/T 3077-1999

Carbon (C) 0.38 to 0.45

Silicon (Si) 0.17 ~ 0.37

Provide 4140 alloy structural steel

Provide 4140 alloy structural steel

Manganese (Mn) 0.50~0.80

Phosphorus (P) ≤ 0.035

Sulfur (S) ≤ 0.035

Chromium (Cr) 0.9 to 1.20

Nickel (Ni) ≤ 0.30

Molybdenum (Mo) 0.15 ~ 0.25

Copper (Cu) ≤ 0.30

Mechanical properties:

Tensile strength σb (MPa): ≥ 1080 (110)

Yield strength σs (MPa): ≥ 930 (95)

Elongation δ5 (%): ≥12

Area shrinkage ψ (%): ≥ 45

Impact work Akv (J): ≥ 63

Impact toughness value αkv (J/cm2): ≥78(8)

Hardness: ≤217HB

Its corresponding international standard organization number: 42CrMo4

Corresponding Japanese brand: SCM440

Corresponding to the German brand: 42CrMo4

Approximate to the US brand: 4140

Corresponding to British BS 708M40/708A42/709M40

Corresponding to French NF 40CD4/42CD4

Corresponding to China GB 42CrMo

Corresponding to Russian ГOCT 38XM

Capacities

VIIPLUS has extensive knowledge in the production and engineering of parts related to any heavy industry.

Beyond Grease: A Deep Dive into Oilless Bushings & Why Viiplus Leads the Way

Friction is the enemy of efficiency. In countless machines, from massive industrial equipment to intricate automotive components, the constant battle against wear and tear dictates performance, longevity, and maintenance costs. Traditionally, grease and oil have been the go-to solutions, but they come with their own set of challenges: frequent re-lubrication, potential contamination, environmental concerns, and limitations in extreme conditions.

Enter the world of oilless bushings, also known as self-lubricating bearings or sliding bearings. These innovative components offer a smarter way to manage friction, delivering reliable movement without the need for external lubrication.

At Viiplus (www.viiplus.com), we don't just supply these components; we engineer solutions. Leveraging deep expertise in metallurgy and tribology (the science of friction, wear, and lubrication), we've become a leading name in sliding bearing technology. But what exactly are oilless bushings, and why should they be on your radar? Let's dive deeper.

What Exactly Are Oilless Bushings? The Science of Self-Lubrication

Unlike traditional ball or roller bearings that rely on rolling elements and require constant lubrication films, oilless bushings operate on the principle of sliding motion. Their "magic" lies in their material composition and structure, designed to provide their own lubrication at the bearing surface. This can be achieved through several key technologies:

1. Solid Lubricants Embedded: Materials like graphite, MoS₂, or PTFE are embedded directly into the metallic matrix (often bronze) of the bushing. As the shaft rotates or slides, a minuscule amount of this solid lubricant is transferred to the mating surface, creating a low-friction film.

2. Porous Metal Structures: Sintered bronze or iron materials are created with microscopic pores. These pores are vacuum-impregnated with oil during manufacturing. In operation, slight heating causes the oil to expand and seep onto the bearing surface, providing lubrication. When it cools, the capillary action draws the oil back in, creating a closed-loop system.

3. Layered Composites: These often feature a strong backing (like steel), an intermediate sintered layer (like bronze), and a low-friction overlay (often PTFE-based). The PTFE layer provides the primary sliding surface, offering extremely low friction.

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Contrasting Logic: Oilless vs. Traditionally Lubricated Bearings

The Tangible Benefits: Why Make the Switch?

Choosing oilless bushings isn't just about eliminating grease guns. It's about unlocking significant operational advantages:

• Drastically Reduced Maintenance: This is the most obvious benefit. No re-greasing means less labor, less scheduled downtime, and simplified maintenance protocols. Imagine the savings across a factory floor!

• Enhanced Reliability: Lubricant starvation is a major cause of bearing failure. Self-lubricating bearings ensure consistent lubrication, leading to predictable performance and longer service life, especially in hard-to-reach locations.

• Superior Performance in Harsh Conditions: Oilless bushings excel where traditional lubricants fail:

  • High Temperatures: Certain types can operate at temperatures far exceeding the limits of conventional greases.

  • Low Temperatures: No grease means no stiffening or freezing issues.

  • Contaminated Environments: The absence of sticky grease reduces the ingress of dirt, dust, and debris.

  • Vacuum or Underwater: Ideal for applications where liquid lubricants are impractical or impossible.

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• Cost Savings (Total Cost of Ownership): While the initial purchase price might sometimes be higher, the TCO is often significantly lower due to savings on lubricants, labor, downtime, and potential component failure replacement.

• Environmental Friendliness: Eliminating oil and grease leakage prevents contamination of products, machinery, and the environment. Crucial for industries like food processing, pharmaceuticals, and textiles.

• Compact & Simplified Designs: Without the need for lubrication systems (nipples, lines, reservoirs), machine designs can be more compact and streamlined.

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Exploring Viiplus's Portfolio: Finding Your Solution

Viiplus offers a comprehensive range of self-lubricating bearings designed to meet diverse application needs. Understanding the different series helps in selection:

• JDB Series (Graphite Plugged Bronze): Excellent for high-load, low-speed applications, intermittent motion, and high temperatures. The graphite plugs provide continuous solid lubrication. Ideal for heavy machinery, molds, and hydraulic components.

• SF Series (PTFE-Based Composite): Typically metal-backed (SF-1: steel, SF-2: steel/bronze) with a PTFE-based lining. Offers very low friction, good wear resistance, and suitability for dry running or marginal lubrication. Common in automotive, office equipment, and hydraulics.

• JF Series (Bimetal Bushings): Combines a steel backing with a sintered bronze or lead-bronze lining. Good load capacity and fatigue strength. Often used with grease or oil but can operate marginally lubricated. Found in engines, chassis parts, and agricultural machinery.

• FB Series (Wrapped Bronze): Often made from bronze strip, sometimes with lubrication pockets or through-holes. A cost-effective solution for medium loads and speeds, typically requiring initial greasing but offering extended re-lubrication intervals.

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Quick Comparison Chart (General Guide):

(Note: This is a simplified guide. Always consult specific product data sheets or Viiplus experts for precise application requirements.)

Uncertain which material or type suits your project? Our Bushing Material Selection Guide is designed to help, or Contact Us for a Free Quote and Expert Advice.

Why Partner with Viiplus? Expertise Meets Quality

Choosing the right supplier is as critical as choosing the right bushing. Here’s why companies worldwide trust Viiplus:

• Deep Expertise: Our foundation in metallurgy and tribology, coupled with a talented R&D team, means we understand the science behind reliable movement. We don't just sell; we solve friction challenges.

• Uncompromising Quality: We employ advanced manufacturing techniques (including sand casting, centrifugal casting, metal casting, investment casting) and a rigorous quality management system, ensuring every bushing meets the highest standards.

• Comprehensive Range: From standard metric sizes in JDB, SF, JF, and FB series to custom solutions including cylindrical, flange, double flange bushings, wear plates, and guide rails – we have the portfolio to match your needs.

• Global Reach, Seamless Logistics: Based in China, we ship sliding bearings worldwide. Our professional team handles customs clearance efficiently, ensuring smooth, timely delivery with all necessary documentation.

• Customer-Centric Approach: We believe in ethical practices and building trust. We offer flexible production (single units to large series), competitive pricing, and  online support.

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