High-strength brass self-lubricating bearings and sliders

Self-lubricating high-strength brass products are widely used in low-speed, heavy-duty, rotating and sliding parts that are difficult to lubricate or have no oil lubrication.

The main material of the solid inlaid self-lubricating bearing slider is high-strength brass as the base and inlaid with solid lubricant. The friction heat during use is used to form a self-lubricating oil film mixed with oil and ultra-fine powder, which breaks through the limitations of ordinary bearings relying on oil film lubrication. It has high hardness, excellent wear resistance and high load-bearing capacity. Has the following advantages:

1. High precision and good running-in performance, suitable for sliding parts of various molds.

2. It has good wear resistance and extremely low friction coefficient.

3. Suitable for reciprocating, rotating, swinging and intermittent motions where oil film is difficult to form.

4. Corrosion-resistant and chemical-resistant.

6. Maintenance-free and long service life, it is widely used in automobile molds and plastic molds.

The main model of high-strength brass self-lubricating bearings is JDB500#, which is widely used in automotive stamping dies (blanking dies, drawing dies, bending dies, punching trimming dies, hemming dies, etc.) and mechanical equipment (plastic machinery , engineering machinery, metallurgical forging, mining machinery, etc.

High-strength brass is used as the base, and oil-absorbing graphite columns are embedded as solid lubricants. The unique graphite arrangement technology and graphite hole processing method independently developed by the company are applied, and combined with advanced vacuum oil immersion technology, the self-lubricating guiding performance is fully exerted.

1. High-quality base material. The copper-based brass guide plate guide bushing is made of high-strength brass material through continuous casting and extrusion rolling. It has a dense structure and very few impurities such as Sn, Ni, Pb, S, etc., or even less than 0.1%, the hardness exceeds HB200, ensuring excellent wear resistance.

2. High-quality natural graphite. We select high-quality natural graphite and adopt advanced powder extrusion sintering technology to make the graphite columns have a uniform and dense structure. In addition to self-lubrication, its own loss is minimal, fully ensuring that the lubricating oil content between the tissues is sufficient. This reduces the wear of the base of the guide plate and guide sleeve and effectively extends the service life.

3. Vacuum immersion oil technology. The use of vacuum immersion oil technology fully ensures that any gap between the graphite column structures is immersed in saturated lubricating oil. In this way, after the relative friction of the matrix heats up, the volume of the oil molecules expands, from The graphite columnar tissue seeps out to the surface of the matrix, instantly reducing the temperature of the matrix and achieving the ideal self-lubricating effect.

4. Diameter of graphite holes. On the premise of ensuring sufficient stiffness and strength of the matrix, the diameter of the graphite holes is drilled relatively small. In this way, the graphite columns are arranged relatively densely on the matrix, and the lubricating oil content after vacuum oil immersion is relatively small. More saturated, better lubrication effect.

5. Graphite hole depth. On the premise of ensuring sufficient stiffness and strength of the matrix, the graphite hole is drilled deep enough (about 7mm, usually 4 to 5mm). After vacuum oil immersion, the lubricating oil content will be more and the lubrication effect will be better.

6. Graphite holes "overlap". On the self-lubricating surface of the self-lubricating guide plate and guide sleeve, the distance between the edge of the graphite hole and the edge of the substrate is regarded as the "overlap value". This value is also considered to be set to the minimum on the premise of ensuring sufficient stiffness and strength of the base body, so that the effective lubrication area is large enough and the self-lubricating effect is more prominent.

7. Graphite hole "interference", between any two adjacent graphite holes (columns) (whether horizontal or vertical), the tangent line drawn by the two adjacent quadrant points (a tangent line passes through another graphite hole) The distance between them is called "interference". Due to the existence of interference, the guide plate ensures that the entire self-lubricating surface except the "overlap" is in "oil lubrication" under working conditions, regardless of whether it is in the horizontal or vertical direction. That is, there is no dry area. This avoids dry grinding between guide plates and extends the service life of the guide plates.

8. Effective self-lubricating area. Three circles of the same diameter are circumscribed to each other, and the middle shape is an "arc triangle." The smaller the diameter, the smaller the area of the arc triangle. In fact, the effective self-lubricating area naturally increases and the lubrication effect is enhanced. Customer When using high-strength alloy copper + solid lubricant products, you should consider using oil or other lubricants. In the case of high rotational speed, it may be better to use high-lead-tin bronze, although its hardness is low.